This sequence of events represents the process by which sound waves are converted into electrical signals that are sent to the brain for processing and interpretation.
The correct order of the steps involved in how we hear is:
Sound waves enter the auditory canal.The eardrum vibrates.The hammer, anvil, and stirrup transfer vibration to the oval window.Pressure waves of the cochlea move the basilar membrane.Stimulated hair cells send information to the auditory nerve.The auditory nerve carries information to the thalamus.The thalamus directs information to the brain's primary auditory cortex.The process begins when sound waves enter the ear and travel through the auditory canal. The eardrum vibrates in response to the sound waves, and this vibration is transmitted through a series of tiny bones in the middle ear called the hammer, anvil, and stirrup. These bones transfer the vibration to the oval window, which is a membrane that separates the middle ear from the inner ear. The pressure waves created by the movement of the oval window cause the basilar membrane in the cochlea to move. The basilar membrane is lined with tiny hair cells that are stimulated by the movement, and these hair cells send electrical signals to the auditory nerve. The auditory nerve carries these signals to the thalamus, which acts as a relay station for sensory information. Finally, the thalamus directs the information to the brain's primary auditory cortex, where the sound is perceived and interpreted.
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what are the basic functional differences between resident cells and wandering cells in connective tissue?
cells that are permanently housed inside the connective tissue; resident cells. Wandering cells are part of the immune system and are constantly moving throughout the connective tissue.
Both resident (or fixed) cells as well as visiting (or wandering) cells are found in connective tissues. While wandering cells do not maintain a fixed position, resident cells do, inside a fixed position with connective tissues. Fibroblasts, macrophages, mast cells, and adipocyte cells are some of the resident cells. These immovable macrophages act as "checkposts," preventing the invader from getting close to sensitive body parts. The body's connective tissues are home to the roving or non-fixed macrophages. They are the first to a site of infection, such as leucocytes, and they eradicate the microbes there.
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what is the name of the structure located inside the cochlea that contains auditory receptors?
The Instrument of Corti, an inner ear component that aids in hearing, is housed in the cochlea.
The auditory receptor cells, called hair cells, lie embedded within the basilar membrane. This membrane divides the spiraled cochlea into upper and lower chambers. Movement of the fluid within the cochlea causes stimulation of the hair cells.The Instrument of Corti, an inner ear component that aids in hearing, is housed in the cochlea. The cochlea consists of a coiled labyrinth, like a snail, which is about 10 mm across and has about 2.5 turns in humans, embedded in the temporal bone of the skull. Inside the inner ear there is an organ called Organ of Corti located in a fluid environment that host the auditory receptor cells. These auditory receptor cells can be outer hair cells or inner hair cells.
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what do you call to the ability to move a body part through full range of motion at a joint?
Flexibility is the ability of your joints to move through their full range of motion without any pain or stiffness.
There are 2 types of stretching - isometric and dynamic.
Isometric stretching can be defined as the kind of stretching where increases strength and flexibility.
whereas, the Dynamic stretching is when you take a particular part and the you allows the joints and muscles to move through their full range of motion.
flexibility is much needed in life because, this kind of movement potential during daily activities, sports, and exercise help in increasing stamina and also for the greater range of motion during activities.
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Lots go back 30 years before coral bloaching was as coinmon and not well understood. You are a toierfiat that has coserved that corais tend to bleach in the summer when ocean teinperatures are warmet. Yos design an experimont to inst the typothesis that corals expel the agile when exposed to warmer ocean temperafures. You set up two tanks and put several pieces of cord in eoch tank In one tark, you set the wasor temperature to the avorage waler temperabure on the teel (77 degrees ). in the other tank, you set the temperakute so the higehat waler temperature coserved in the summer (87 degrees). Aher two weeks you count the number of algae left in oach pioce of coral (utsualy oxprossed as number of aboe percm 2 of coraf. You then caloiate an average nimber of algae per coral for each lark and graph hi. (See diagrem for esperimentai designv. Based on your observation and your experimental design, what do you predict will happea? Rocall that you are counting the algae that are left in the coral, not the algae that is expelied. The coral in the Bf degree tark will have lest aigae lett in its tssues after teo meeks The corai in the 67 degroe tark wal have the sume anount of abse ieft in de lissues after two aseks
Based on the your observation and the experimental design, we can predict that when water is too warm, the corals will expel the algae living in their tissues causing them to turn completely white.
The corals can bleach the algae living inside their tissues, specifically zooxanthellae. It causes the algae to turn color and itself becomes completely white. This is called coral bleaching. The effect of bleaching on corals is that it itself does not die but is subjected to mortality.
The microscopic algae, known as zooxanthellae, gives many of the host species' characteristic yellowish and brownish hues. During the day, they supply their host with the organic carbon products of photosynthesis, sometimes meeting up to 90% of their host's energy requirements for metabolism, growth, and reproduction.
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the inferior, conical end is called the __________. it projects slightly anteroinferiorly toward the left side of the body.
Apex. The fifth intercostal space is the location of the apex, which is the heart's most inferior, anterior, and lateral component while it is in situ. The left ventricle shapes it.
Both atria, but primarily the left, make up the base of the heart, or the posterior region. Due to the twisting of the heart during development, which causes the left atrium and ventricle to lay posteriorly, the right atrium and ventricle make up the majority of the anterior portion of the heart.
Just inside the second costal space on the left side is the superior section of the heart, which is mostly made up of the left atrium.
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The effects of genetic drift are more pronounced in larger populations.a. True.b. False.
False. The effects of genetic drift are not more pronounced in larger populations.
Genetic drift is a mechanism of evolution that refers to the random fluctuations in the frequency of alleles in a population over time. The effects of genetic drift are more pronounced in smaller populations, because chance events such as genetic mutations or the loss of individuals can have a larger impact on the gene pool of a smaller population. In larger populations, the effects of genetic drift are diluted, as the number of individuals carrying each allele is greater. This means that the frequency of alleles is less likely to be strongly influenced by random events, and is instead shaped more by natural selection and other evolutionary forces. It's important to note that genetic drift can still occur in larger populations, but its effects will be less pronounced than in smaller populations.
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a prophage is able to infect a bacterium plasmid and lay in its dormant state during the lysogenic cycle. why is this more virulent and why does it make sense that it will be able to infect more host cells?
When phage DNA is incorporated into the host genome during the lysogenic cycle, a prophage is created and passed on to succeeding cell generations. It is possible for the prophage to be excised and enter the lytic cycle as a result of environmental stressors like malnutrition or exposure to harmful substances.
Every time a cell divides after that, the bacteriophage's genetic material, known as a prophage, can be transferred to the daughter cells. Further events may release the prophage genetic material, which would then lead to the lytic cycle's ability to multiply new phages. Although the process of DNA inclusion is not entirely known, lysogenic cycles can also happen in eukaryotes. For example, the AIDS viruses can infect people lyrically or lay dormant in the genome of the infected cells, retaining the power to lyse at a later time. This article's remaining sections discuss lysogeny in bacterial hosts.
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why do Forests reach their greatest ecological complexity when they are mature and exhibit a multi-level canopy
Forests reach their greatest ecological complexity when they are mature and exhibit a multi-level canopy due to the many levels of competition for light and resources.
What is ecological complexity?Ecological complexity is a term used to describe the relationships between organisms and their environment. It emphasizes the intricate web of interactions between living organisms and nonliving components of the environment.
As trees grow, they compete for light and resources in several ways. Trees on the upper canopy layers are able to outcompete trees on lower layers for resources because they are able to access more sunlight. In addition, as trees grow taller, they cast larger shadows, further limiting resources for trees in the lower layers. This competition creates a layered forest structure in which different species of plants and animals are adapted to different layers. This structure allows for an increased diversity of species and interactions between them, leading to a more complex and intricate ecological system.
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what is the structural difference between atp and datp? what is the structural difference between atp and datp? atp has a 2' oh and 3' oh datp has a 2' h and 3' oh atp has a 2' oh and 3' oh datp has a 2' oh and 3' h atp has a 2' h and 3' oh datp has a 2' oh and 3' oh atp has a 2' oh and 3' h datp has a 2' oh and 3' oh
The structural difference between ATP as well as dATP will be ATP has a 2' OH and 3' OH, while dATP has a 2' H and 3' OH. Option A is correct.
The structural difference between ATP (adenosine triphosphate) as well as dATP (deoxyadenosine triphosphate) is that dATP has a deoxyribose sugar while ATP has a ribose sugar. The ribose sugar in ATP has a hydroxyl group (-OH) attached to both the 2' and 3' carbons, while in dATP, the 2' carbon has a hydrogen atom (-H) instead of the hydroxyl group, and the 3' carbon has a hydroxyl group (-OH).
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--The given question is incomplete, the complete question is
" what is the structural difference between ATP and dATP? A) ATP has a 2' OH and 3' OH dATP has a 2' H and 3' OH B) ATP has a 2' OH and 3' oh dATP has a 2' OH and 3' h C) ATP has a 2' H and 3' OH dATP has a 2' OH and 3' OH D) ATP has a 2' OH and 3' H dATP has a 2' OH and 3' OH"--
47
In cows, the allele for fur color is controlled by codominant alleles. A cow that is homozygous black (FF) is
crossed with a cow that is homozygous white (WW). The offspring produced will be
F
F
W
W
FW
FW
A Gray all over
C Completely black
FW
FW
B Black and white spotted
D Gray and white
Codominant alleles in cows regulate the fur colour allele, meaning that when both the black and white alleles are present in a single person, both alleles express themselves equally.
What are alleles?Alleles are different versions of a gene that exist at a certain locus (position) on a chromosome in genetics. They are in charge of a population's genetic variety and determine several variations of a particular feature, such as eye colour or blood type. Each gene has two alleles, one from each parent, which are present in every person. The individual is homozygous for that gene if both alleles are the same; otherwise, the individual is heterozygous. The dominant allele in a dominant-recessive relationship is expressed in an individual's phenotype, but the recessive allele is only expressed when two copies are present (homozygous recessive).
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What diversity refers to all the different genes contained within all members of a population.speciesecosystemgeneticcharacter
Genetic diversity is the term used to describe all the many genes that exist in every member of a community.
It is a measurement of the genetic diversity among members of the same species within a population of individuals. A species' capacity to survive and adapt depends on its genetic variety because it promotes the operation of natural selection and permits populations to adjust to environmental changes. Losing genetic variety can have unfavorable effects, such as lowering a population's ability to withstand environmental stresses and raising disease susceptibility. Genetic recombination during sexual reproduction, genetic mutations, and population movement are the causes of this variance. The basic components of heredity that regulate an organism's traits are called genes. Genetic diversity, which in turn defines the features and characteristics of the people within a group, is based on the diversity of genes within a population.
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if 24% of a dna sample is made up of thymine, t, what percentage of the sample is made up of adenine, a?
There are two complementary sets of 4 potential nucleotides. If cytosin makes up 24% of the DNA, the complementary guanin must make up the remaining 76%. With 48% GC and 52% AT remaining, 26% are adenine and 26% are thymine.
Two purine residues and two pyrimidine residues make up the nitrogenous bases found in DNA molecules. Adenine and guanine are the pyrimidine bases found in DNA, while cytosine and thymine are purine bases. The chemistry of the bases shows how purine and pyrimidine bases differ from one another. Purine bases have two cyclic ring structures, whereas pyrimidine bases only have one, which results in a distinct chemical structure. The chemistry of nitrogenous bases is what really determines how DNA works. It enables a process known as complimentary base pairing.
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Which of these is NOT true of the Kingdom Aveolata?a. Some members of this kingdom are decomposers, showing ecological convergence with the fungi.b. Some member of this kingdom a free-living and covered with cilia.c. Some members of this kingdom cause human diseases that require an insect vector.d. Some members of this kingdom are an important component of the phytoplankton.
Option C, Some members of this kingdom cause human diseases that require an insect vector.
The Kingdom Protista, also known as the Kingdom Protoctista, is a diverse group of single-celled and simple multicellular organisms. Members of this kingdom occupy a wide range of ecological niches and perform various important roles in the ecosystem. Some members of the Kingdom Protista are decomposers, like some human diseases, showing ecological convergence with the fungi. Some members of the kingdom are free-living and covered with cilia, which helps them to move and feed. Some members of the kingdom are an important component of the phytoplankton, which is the base of the aquatic food chain. However, none of the members of the Kingdom Protista cause human diseases that require an insect vector, which are usually caused by organisms from the Kingdom Animalia or Kingdom Fungi.
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The complete Question is:
Which of these is NOT true of the Kingdom Aveolata?
a. Some members of this kingdom are decomposers, showing ecological convergence with the fungi.
b. Some member of this kingdom a free-living and covered with cilia.
c. Some members of this kingdom cause human diseases that require an insect vector.
d. Some members of this kingdom are an important component of the phytoplankton.
what feature of phospholipids allows them to interact with aqueous cytosol and extracellular fluid, while still presenting a barrier to hydrophilic substances
Phospholipids are important components of biological membranes, which divide the insides of cells or organelles from their surroundings. Phospholipids' unique structure allows them to interact with aqueous cytosol and extracellular fluid while still presenting a barrier to hydrophilic substances.
Phospholipids have a hydrophilic head and a hydrophobic tail. A phosphate group is often coupled to a small polar molecule such as choline or serine as the head group. The hydrophobic tail is typically made up of two nonpolar and hydrophobic fatty acid chains of varied length and saturation.
When phospholipids are exposed to water molecules, the hydrophilic head group attracts them and interacts with the surrounding fluid. Water repels the hydrophobic tail, which prefers to cluster together away from the aquatic environment. As a result, a lipid bilayer forms, with the hydrophobic tails facing each other and the hydrophilic head groups facing outward towards the cytosol and extracellular fluid.
The hydrophobic core of the lipid bilayer forms a barrier that inhibits hydrophilic entities such as ions and polar molecules from passing through the membrane. Small hydrophobic molecules like oxygen and carbon dioxide, on the other hand, can permeate through the lipid bilayer.
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Which molecular process is found only in retroviruses?
Transduction of cellular genes molecular process is found only in retroviruses.
A retrovirus is a type of virus that inserts a DNA copy of its RNA genome into the DNA of a host cell that it infects, modifying the genome of that cell. Once within the host cell's cytoplasm, the virus employs its own reverse transcriptase enzyme to generate DNA from its RNA genome, which is the opposite of the usual pattern, so retro. The new DNA is then incorporated into the host cell genome by an integrase enzyme, at which time the retroviral DNA is referred to as a provirus. The host cell then treats the viral DNA as part of its own genome, transcribing and translating the viral genes alongside the cell's own genes, creating the proteins required to build new copies of the virus.
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how does domain eukarya different from the domains bacteria and archaea?
Answer:
Explanation:
The three domains of life - Bacteria, Archaea, and Eukarya - are defined based on differences in cell structure, genetic makeup, and biochemistry.
Bacteria are single-celled organisms that lack a nucleus and other membrane-bound organelles. They have a simple cell structure, and their genetic material is contained within a single, circular chromosome located in the cytoplasm.
Archaea are also single-celled organisms that lack a nucleus, but their cell structure and biochemistry are distinct from bacteria. For example, their cell walls are made of different materials, and they are able to survive in extreme environments such as hot springs and salt lakes.
Eukarya, on the other hand, are characterized by cells that contain a nucleus and other membrane-bound organelles. This domain includes all organisms with cells that have a complex structure, including plants, animals, fungi, and protists. Eukaryotic cells have a more complex organization and division of labor compared to bacteria and archaea. Additionally, the genetic material of eukaryotes is contained within a nucleus, which is separated from the cytoplasm by a double membrane.
Overall, the differences between the three domains of life reflect the distinct evolutionary paths that these organisms have taken and the adaptations they have made to survive in their environments.
How might biodiversity help an ecosystem recover from a volcanic eruption?
Biodiversity can help an ecosystem recover from a volcanic eruption in several ways:
Increased resilience: Biodiverse ecosystems are more resilient to environmental stressors, such as volcanic eruptions, as they contain a variety of species that are adapted to different conditions. This allows the ecosystem to recover more quickly as different species can fill the gaps created by the eruption and re-establish a balance.
Soil stability: Many plant species have deep roots that help to stabilize the soil and prevent erosion. This is especially important in the aftermath of a volcanic eruption, where the soil can become loose and prone to erosion. A diverse array of plants can help to restore stability to the soil and prevent further damage.
Nutrient cycling: Biodiverse ecosystems have a greater variety of species that are able to process and recycle nutrients, such as nitrogen, phosphorus, and sulfur. This can help to restore the nutrient balance in the ecosystem and support the growth of new vegetation.
What layer are the tectonic plates moving on?
Answer:
mantle
Explanation:
Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock.
Answer:
mantle
Explanation:
dual innervation means that an individual effector
An individual effector is said to have dual innervation if it gets information both from parasympathetic and sympathetic nervous systems. Heart rate is negatively impacted by both the sympathetic and parasympathetic nervous systems.
The dual innervation of many sensory receptors of a autonomic nervous system means that they receive opposing signals from the parasympathetic and sympathetic ganglia. The preganglionic neuron has its cell body in the brainstem or the lateral horn of the grey matter of the spinal cord, where it develops in the central nervous system. This neuron's axon travels to an autonomic ganglion outside the central nervous system, where it connects to a postganglionic neuron. The effector tissue is innervated by this neuron.
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qyuizlet which action could help a biologist determine whether a particular plant population had been attacked by a bacterial pathogen in the recent past?
The action that could help a biologist determine whether a particular plant population has been attacked by a bacterial pathogen in the recent past is to look for elevated levels of mRNA transcripts for PR proteins in plant tissues samples.
Among all of plant reactions, the activation and accumulation of pathogenesis-related (PR) proteins in plants is crucial because PR proteins are an essential part of innate immune responses in plants exposed to biotic or abiotic stress. The PR proteins accumulate locally in the infected and surrounding tissues as well as in distant, uninfected tissues, shielding the plants against further infection. If elevated levels of mRNA are found in a plant tissue, it would indicate that the plant had been exposed to some bacterial infections.
Any type of pathogen, be it bacterial or viral, prevents plant to perform its normal functions and resist it to manufacture the food it prepares. Plant pathogens are responsible for plant diseases. They resist the plant to perform its potential well and may deteriorate its quality or the quantity of its produce.
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T/F. Banting's method of isolating insulin involved a surgical procedure to tie off ducts in the pancreas, waiting several weeks, then removing the pancreas
Banting's method of isolating insulin, which involved tying off ducts in the pancreas, waiting several weeks, and then removing the pancreas, is false. Banting, Best, and Macleod first collaborated to begin their research, attempting to determine how to remove insulin from a dog's pancreas.
Their method involved blocking the pancreatic duct in order to kill other substances in the pancreas that would destroy insulin while leaving the islets alone. The remaining extract would then be administered to other dogs who didn't produce any insulin because their pancreas had been removed in order to test its effects on blood sugar levels.
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which of the following characteristics are not shared by land plants and charophytes? 1. use chlorophyll a, chlorophyll and carotene 2. presence of chloroplasts 3. presence of a cell wall 4. protection of embryo in gametophyte
Protection of embryo in gametophyte is the characteristics are not shared by land plants and charophytes.
Charophytes have chlorophyll a and b, store carbohydrates as starch, have cell walls consisting of cellulose, and undergo similar cell-division processes. Charophytes are non-vascular plants but land plants have well developed vascular tissues like the xylem and phloem. Charophytes do not form embryos but land plants do. Land plants have apical meristem responsible for the growth and exhibit alternation of generation in their life cycle.
Charophytes are the group of green algae whose ancestral lineage gave rise to land plants in what resulted in a profoundly transformative event in the natural history of the planet.
The green algae are basically divided into Charophyte and Chlorophyte algae, and it is agreed that the Charophyte algae are the closest algal relatives of land plants.
Charophytes consist of sporopollenin while land plants consist of the cellulose cell wall. Charophytes have flagellated sperms while land plants have round and non-flagellated sperms.
Protection of embryo in gametophyte is the characteristics are not shared by land plants and charophytes.
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why is it necessary to clear out dna methylation during the production of gametes?
It is necessary to clear out DNA methylation during the production of gametes because DNA methylation is an epigenetic modification that can affect gene expression and regulation.
During the production of gametes, the DNA in the germ cells is extensively reprogrammed to erase the DNA methylation patterns that have accumulated during the development and aging of the parent. This is necessary to prevent the inheritance of epigenetic marks that may affect the proper development of the embryo and subsequent generations. Clearing out DNA methylation during gamete production is also important for ensuring proper imprinting, which is regulated by DNA methylation and expressed in a parent-of-origin-specific manner. Proper erasure and re-establishment of DNA methylation patterns during gametogenesis are crucial for the maintenance of proper imprinting in the offspring. Clearing out DNA methylation during gamete production ensures the proper development and health of the offspring and subsequent generations by preventing the inheritance of epigenetic marks that may affect gene expression and regulation.
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True or false? Genetic drift is more significant in small populations.
True. Smaller populations experience greater genetic drift.
Owing to stochastic sampling error, smaller populations typically lose their genetic diversity less quickly than larger populations (i.e., genetic drift). The reason for this is that tiny populations make it more likely for some gene variants to be lost through random chance. A mutation's frequency in a population may shift randomly from one generation to the next due to the population's limited size. This phenomenon is known as genetic drift. Small, reproductively phenotypic traits may experience rapid changes in gene frequencies due to unique conditions that are completely unrelated to mutation and natural selection. Only random variables can explain these fluctuations.
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The fluid mosaic model of the membrane proposed that membranes:A Consist of a single layer of phospholipids and proteins.B Consist of a phospholipid bilayer composed of a variety of fatty acids.C Consist of protein molecules embedded in a dynamic bilayer of phospholipids.D Consist of a phospholipid bilayer between two layers of hydrophilic proteins.
The correct answer is option C. According to the fluid mosaic model of the membrane, proteins are encapsulated in a dynamic bilayer of phospholipids in membranes.
S.J.'s hypothesis states that the cell membrane. G.L. Singer and is made up of a protein-coated phospholipid bilayer, according to Nicolson in 1972.
The phospholipid bilayer is constantly changing as a result of the numerous internal and external stimuli it is exposed to, and the proteins create a mosaic of different configurations.
The proteins may interact with the polar head groups of the bilayer and the nonpolar core of the membrane because they are amphipathic or have both hydrophilic and hydrophobic areas.
The proteins are necessary for signal transduction, molecular transport, and cell-to-cell recognition. The barrier that controls how chemicals enter and leave the cell is the semi-permeable phospholipid bilayer.
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Increases in _____ increase hunger, whereas increases in ____ decrease hungerA. orexin; blood glucoseB. hypothalamus ; blood glucoseC. blood glucose ; stored energyD. stored energy ; orexin
Increases in Orexin increase hunger, whereas increases in blood glucose decrease hunger.
The neuropeptide hypocretin is also known as orexin since its orexigenic activity was discovered early on. Orexin/hypocretin (OX) neurons project broadly throughout the brain, and the physiologic and behavioral roles of OX are far more complicated than was previously thought based on feeding stimulation.
OX primarily regulates processes related to attention, alertness, and motivation. OX also serves a variety of important roles in the regulation of food intake, metabolism, and overall energy balance in animals.
OX signaling not only stimulates food-seeking behavior after a short fast to boost food intake and defend body weight, but it also promotes energy expenditure to guard against obesity.
Furthermore, OX affects the autonomic nervous system to regulate glucose metabolism, especially during hypoglycemia reaction. OX neurons are consistently controlled by a number of dietary signals (including the hormones leptin and ghrelin) and metabolites (e.g., glucose, amino acids).
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Select all of the following that are true about prokaryotes. ***A. Most ancient forms of life on Earth.B. Evolved after eukaryotes.C. Contain membranous organelles.***D. Lack a nucleus.***E. Simplest types of life
All the prokaryotes cells are the most ancient form of life on the earth which lacks a nucleus, and simple types of life, thus the correct answers are options (A, D, E).
A prokaryote is a basic one-celled creature that lacks a nucleus and organelles that are connected to membranes. For the time being, it is crucial to remember that prokaryotic cells do not contain internal membrane barriers that divide them into compartments, but rather are composed of a single open region. In the section on eukaryotic cells, we'll go into additional detail on the nucleus and organelles.
Prokaryotic DNA is usually found in the nucleoid, which is at the heart of the cell. Large loops of bacterial DNA typically take the form of circular chromosomes. The cut-away graphic of a rod-shaped bacteria below shows the nucleoid and some other typical prokaryotic features.
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Phospholipid bilayers are an effective barrier to many charged or polar solutes because of their _____ interior region
Hydrophobic interior region. Phospholipid bilayers consist of two layers of phospholipid molecules, each containing a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail.
This hydrophobic interior region makes the phospholipid bilayer an effective barrier to many charged or polar solutes, such as ions and sugars, which cannot easily cross the hydrophobic region of the membrane. Only small, uncharged molecules, such as oxygen and carbon dioxide, can easily diffuse through the hydrophobic region of the membrane. Larger molecules, such as proteins and nucleic acids, require specific transport mechanisms, such as channels, carriers, or pumps, to cross the membrane. Phospholipid bilayers consist of a double layer of phospholipid molecules. A phospholipid molecule has two parts: a hydrophilic (water-loving) head, which is usually polar or charged and can interact with water, and a hydrophobic (water-fearing) tail, which is nonpolar and cannot interact with water. When placed in an aqueous environment, such as the fluid surrounding cells, phospholipid molecules will spontaneously arrange themselves into a bilayer with their hydrophobic tails pointing inward and their hydrophilic heads pointing outward, interacting with water.
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Why is genetic drift aptly named?
Genetic drift is aptly named because it causes allele frequencies to rise or fall over time. Gene drift is a purely random process. This distinguishes it from natural selection, which relies on environmental influences.
What is Genetic Drift called?Genetic drift describes random fluctuations in the number of genetic variants within a population. It occurs when the occurrence of genetic variants, called alleles, randomly increases or decreases over time. Genetic drift, also known as genetic sampling error or Sewall-Wright effect, and is a purely random change in the gene pool of small populations.
What are the characteristics of genetic drift?Unlike natural selection, genetic drift does not depend on the beneficial or detrimental influence of alleles. Instead, a random subset of individuals (and the gametes of those individuals) is sampled to generate the next generation, so drift purely randomly alters allele frequencies.
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when phospholipids are placed in water they spontaneously from a bilayer with which of the following
- the polar heads on the surface and the non polar tails in the interior
- the polar heads on the surface and the non polar tails in the exterior
When phospholipids are placed in water they spontaneously form a bilayer with the polar heads on the surface and the nonpolar tails in the interior because fatty acid tails are poorly soluble in water therefore phospholipids at that moment form bilayers in aqueous solutions, Then the hydrophobic tails buried in the interior of the membrane and the polar head groups exposed on both sides.
The arrangement of this lipid bi layer consists of head containing phosphate group, which has a polar character or negative charge, and an area called the tail (the fatty acids), which is neutral. Therefore the head can form hydrogen bonds, but the tail cannot. Therefore the head remains outside forming hydrogen bonds with the water molecules that's why they are called hydrophilic.
On the other hand the tail remains in the interior that's why they are hydrophobic.
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