Answer:
Single-cell prokaryotes. Scientists think that all of life on earth originated from single-cell prokaryotes, which are the simplest form of life. These single-celled organisms are believed to have evolved over billions of years, eventually giving rise to more complex multicellular organisms. Stromatolites are the oldest known form of life on earth, and are formed by the growth of ancient single-celled prokaryotes. Single-cell eukaryotes are more complex than prokaryotes, and are believed to have evolved from them.
A herd of elephants is grazing in a grassland dotted with small trees and shrubs. Zebra’s are grazing alongside them. A group of rhino is bathing in a lake nearby.
The elephants represent?
a.) community
b.) population
c.) biosphere
d.) ecosystem
The elephants represent population. All nationals present in, or temporarily absent from, a country, as well as foreigners permanently resident in a country, are considered population. Correct option (B).
All citizens present in, or temporarily absent from, a country, as well as foreigners permanently resident in a country, are characterized as population. This statistic depicts the average number of people who reside in a certain location. The yearly changes in population caused by births, deaths, and net migration during the year are referred to as growth rates.
National military forces stationed abroad; commercial seafarers at sea; diplomatic staff stationed abroad; civilian immigrants residing in the country; displaced individuals resident in the country comprise the total population. It does, however, preclude the following: foreign armed forces stationed in the nation; foreign diplomatic staff stationed in the country; and civilian immigrants visiting the country temporarily. A typical demographic technique is population forecasts.
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what type of transport does not require energy? provide an example of one process that is a type of passive transport? 2. what are the two main components of the cell membrane? 3. how does oxygen cross into the cell? how does glucose cross into the cell? 4. what is the purpose of a channel protein? 5. what are the two parts of a phospholipid: 6. define diffusion. 7. define osmosis: 8. what is a solute?
Transfer of solute across the membrane without the expense of energy is called passive transport.
1. An example of passive transport is diffusion where the solute move area of high concentration to area of low concentration.
2. The two main components of cell membrane are proteins and lipid.
3. Oxygen and other such molecules like carbon move across the cell membrane via the process of simple diffusion. Whereas molecules such as glucose which are too large to move across via simple diffusion need some integral transport molecule such GLUT to move across membrane.
4. The channel proteins in the cell membrane help in transport of molecules across the membrane.
5. The two parts of phospholipid are phosphate group and lipid molecules.
6. Diffusion is the simple movement of molecules along the concentration gradient without the expense of energy.
7. Osmosis is the movement of water molecule across a semi permeable membrane from a point of high concentration to low concentration.
8. Solute is a substance that is dissolved in a soltion.
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how are the other types of food fats, proteins, other carbs related to the process of cell respiration
Other types of food fats, proteins, other carbs are related to the process of cell respiration in that they are all used as sources of energy for the cell.
Carbohydrates, such as sugars and starches, are broken down into glucose molecules which can be used directly by the cell as a source of energy. The breakdown of glucose is the first step in cellular respiration, which occurs in the cytoplasm of the cell.
Fats, such as triglycerides, are also broken down and used as a source of energy. However, the breakdown of fats occurs in the mitochondria, the organelles responsible for cellular respiration, and produces a greater amount of energy per gram than carbohydrates.
Proteins can also be broken down and used as a source of energy, but they are typically not the primary source of energy. Proteins are mainly used for structural and functional purposes, such as enzymes and transport proteins.
Overall, cellular respiration is the process by which cells convert the chemical energy in food molecules into a form that can be used by the cell, called adenosine triphosphate (ATP). All types of food are related to the process of cellular respiration as they are the starting point of the process and their breakdown is the energy source that drives the process.
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cyanobacteria have been genetically modified to produce isobutanol directly what advabtagebdoes this have
In contrast to other potential biofuels, isobutanol can be directly produced by cyanobacteria. As a result, multiple processing stages can be avoided.
Heterologous biosynthetic pathways are used to create cyanobacteria that use photosynthesis to manufacture valuable compounds. In successfully designed cyanobacteria, many compounds have been produced. Target biosynthesis pathway genes are expressed when certain chemical inducer-dependent promoters are activated.
2-ketoisovalerate and 2-ketoisocaproate, which are 2-keto acid precursors in the L-leucine and L-valine biosynthetic pathways, are converted into isobutanol and 3MB in cyanobacteria by KDC and ADH, respectively (See Picture). In order to produce isobutanol and 3MB in PCC 6803 under the influence of green light, we created the expression vector pKT-GSS-KDC-ADH, in which the CcaS/CcaR system was integrated to cause the expression of the kdc and adh genes detailed in the Methods section.
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what is the name of the theory which states that organisms are derived from the assembly and reorganization, somewhat de novo, of substances in the egg?
Epigenesis is the theory which states that organisms are derived from the assembly and reorganization, somewhat de novo, of substances in the egg.
The process through which organisms, including plants, animals, and fungi, evolve from a seed, spore, or egg through a number of phases during which cells divide and organs emerge is known as epigenesis (or, in contrast to preformationism, neoformationism). Aristotle coined the term "epigenetics" in his essay On the Generation of Animals. The historical rejection of epigenesis was hampered by creationist ideas of life's origins, despite the fact that it seems evident in the genetic era of today. However, a protracted and contentious dispute among biologists in the late 18th century led to the eventual replacement of the long-standing preformationist theory with epigenesis.
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Precipitation falls to the ground and eventually ends up in the ocean. Which of the following is the most direct way for the water to get from the soil to the ocean?A. By way of a recharge zone with a low percolation rateB. By way of an open watershedC. By way of a closed watershedD. By way of thermohaline circulation within an aquifer
The most direct way for water to get from the soil to the ocean is by way of an open watershed. The correct answer is B.
An open watershed is a land area where precipitation flows into a stream, river, or other body of water, which then flows into the ocean. This path is considered the most direct way for water to travel from the soil to the ocean. The water does not have to pass through a recharge zone, which is an area where water percolates through the soil and into an aquifer. In a closed watershed, the water flows into a lake or other closed body of water, which may not flow into the ocean. In thermohaline circulation, water is circulated within an aquifer and not directly reaches the ocean. Open watersheds provide the most direct route for water to travel from the soil to the ocean.
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How are lactic acid fermentation and alcoholic fermentation similar? different?
Answer:
One similarity between lactic acid fermentation and alcoholic fermentation is that they are both types of anaerobic respiration, meaning they occur in the absence of oxygen.
One key difference is that lactic acid fermentation results in the production of lactic acid, while alcoholic fermentation results in the production of ethanol and carbon dioxide.
the pharmacy has aminosyn 8.5% in stock. in order to prepare 150 gram of protein, how many ml of aminosyn will be needed from the stock solution
In order to prepare 150 grams of protein from 8.5% of stock solution of aminosyn stock, 1764.71 ml of of aminosyn will be required.
Aminosyn is a solution containing crystalline amino acids solution present along with electrolytes. If a stock solution has 8.5 % of aminosyn it indicates that 8.5 gm of amino acids are dissolved in the solution. Therefore to calculate the amount of protein formed from it, the formula used is:
Amount of solution required (in ml) × concentration of stock solution = Amounts of protein obtained (in gm)
According to the question,
Amount of solution required × (8.5 / 100) = 150 gm
Amount of solution required = (150 × 100) / 8.5 = 1764.71 ml
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in the histology study area, how can you obtain information about the image type, original magnification, tissue source, and the stain or procedure used to obtain the displayed histological image?
In the bottom right corner of the APR window, click the I symbol (information icon). When you enter the dissection or histology study sections for a given bodily system.
you must first choose a perspective, such as anterior or posterior, and then a topic to study, such as muscles of the belly.
Human anatomy is the scientific study of the structures of the human body. Some of these structures are so minute that they can only be seen and examined with the use of a microscope. Other bigger structures may be observed, moved, measured, and weighed with ease.
Microscopic anatomy, commonly known as histology, is the study of animal, human, and plant cells and tissues. Without a microscope, these subjects are too tiny to observe.
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Which type of psychoactive drug is used medically to block pain messages to the brain? (a) Depressants, (b) Hallucinogens, (c) Opiates, (d) Stimulants.
Opiates type of psychoactive drug is used medically to block pain messages to the brain. It is given medically to treat the patient with extreme pain condition.
Opioids, sometimes known as narcotics, are drugs that doctors recommend to relieve severe or chronic pain. People with backaches and chronic headaches utilize them. Opioids bind to opioid receptors, which are proteins found on nerve cells in the brain, spinal cord, gut, and other areas of the body. When this occurs, the opioids stop the brain from receiving pain signals that are delivered from the body through the spinal cord. Opioids involve considerable dangers and can be extremely addictive even if they can successfully treat pain. When opioids are used to treat chronic pain over an extended length of time, the risk of addiction is particularly high.
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true/false. (a) If a particular gene is located on the Z chromosome of this lizard species, describe why a lizard with a ZW genotype has a greater probability of expressing the recessive phenotype for the trait than a lizard with the ZZ genotype does.
If the dominant allele of a sister chromatids, which most often hides the recessive gene, is absent, the recessive trait will become evident. In this case, the gene resides on the Z chromosome.
What gender is the YY?The mother carries the XX chromosome, while the guy carries the XY chromosome. It is not possible for a human to inherit one Y chromosome from his mother and another from his father, which is required for a baby to be have two chromosomes as YY.
What does a chromosomal primarily accomplish?DNA may be precisely duplicated throughout these cell divisions thanks to chromosomes. I'll reiterate it. In our cells, chromosomes are found in the nucleus, where they enable exact information copying during cell division. This guarantees the efficient and proper operation of every internal system.
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Spot the injuries preventions in this photo pls i'll give brainliest!
The top ten ways of injuries preventions in the photo are:
Warm-Up and Cool-Off.Make a session plan.Between-exercise recoveryRecognize Your LimitsApply the right technique.Obtain Qualified Assistance.Put On the Proper Gear.Good RecoveryTake enough Food and DrinkSeek appropriate medical careWhat is injury prevention?Injury prevention is an endeavor to stop or lessen the degree of physical harm brought on by outside forces, such as accidents before they happen.
In a school gym, the possibility of injuries is higher if adequate injury prevention steps are not put in place such as wearing proper gear, warming up, etc.
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An antimicrobial that inhibits cell wall synthesis will result in which of the following?
A) Cells become more susceptible to osmotic pressure.
B) Cells cannot attach to their hosts.
C) Ribosomes lose their function.
D) The sterols in the cell wall become nonfunctional.
E) The replication of cells, including cancer cells, slows down.
An antimicrobial that inhibits cell wall synthesis, by this cells become more susceptible to osmotic pressure, hence option A is correct.
What is the effect of antimicrobials on cells?Antibiotics are defined as substances that help to stop infections caused by bacteria. It is a process of inhibition of cell wall synthesis of bacteria and is one of the mechanisms used by antibiotics to stop the infection.
Osmotic rupture defines as the no balance between the pressure inside and outside of the cell which causes cells to burst.
Therefore, cells becoming more susceptible to osmotic pressure is the correct option.
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quality control vials must be labeled with an expiration date when opened. what is the new expiration date once opened?
The QC solutions can be used until the expiration date on the vial label or for 90 days after they were first opened, whichever comes first. 3.
What is the new expiration date of the QC material once it has been opened?Quality Control is stable once opened for up to 90 days or until the expiration date, whichever comes first. On the vial, write the Date Opened and the Discard Date. Insert a Glucose Test Strip into the metre to begin QC Analysis and turn the metre ON.
Test strips expire 180 days after opening or by the expiration date written on the label, whichever comes first.
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Name the divisions (and sub-divisions) of the nervous system, with a brief description of function.
______, necessary for photosynthesis in plants, is stored in the thylakoids.
Select one:
a.
The nucleus
b.
Mitochondria
c.
Vacuoles
d.
Chlorophyll
Answer: Chlorophyll
Hope this helps :)
Answer:
D, chlorophyll
Explanation:
chlorophyll is one of the most process of making their own food.
explain how the digestive system works. be sure use the terms physical digestion, chemical digestion, metabolism, nutrients, and molecules in your response.
Food is broken down into nutrients such as carbs, lipids, and proteins via the digestive system. They are then taken into the circulation and used by the body for energy, development, and repair.
Unused materials are disposed of like feces . Chemical digestion is the process of breaking down food bindings to transform them into organic molecules. The mechanical breakdown of food is known as physical digestion.
Ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and feces are the six acts involved in digestion. The first of these processes, ingestion, refers to the passage of food the mouth into the alimentary canal.
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The mitotic spindle consists of two types of microtubules: kinetochore microtubules and nonkinetochore microtubules. In animal cells, these two types of microtubules function differently in the stages of mitosis. Complete the sentences by dragging the terms to the appropriate locations. Terms may be used once, more than once, or not at all.
Answer:
Kinetochore microtubules attach to the kinetochore of the chromosomes and help to move them to opposite poles of the cell during the anaphase stage of mitosis. Nonkinetochore microtubules are involved in the formation of the spindle apparatus, which helps to line up the chromosomes in the metaphase stage of mitosis.
At the pet store, what two new carriers is the virus passed to? in the movie outbreak
Puppies from pet stores have been linked to a new outbreak of drug-resistant bacteria.
what exactly was virus ?
A virus is an infectious microorganism made up of a segment of nucleic acid (either DNA or RNA) wrapped by a protein coat. A virus cannot replicate on its own; instead, it must infect cells and use host cell components to replicate. Viruses frequently kill host cells, causing harm to the host organism. AIDS, COVID-19, measles, and smallpox are all well-known examples of viruses that cause human disease.
Viruses that infect bacteria and are frequently referred to as phages have the greatest number. They have many of the same features, but they are far more plentiful. Much future research will focus on the mechanisms by which viruses infect people, as well as possible methods for inhibiting viral replication within human cells.
Puppies from pet stores have been linked to a new outbreak of drug-resistant bacteria.
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if a dna double helix that is 100 base pairs in length has 32 adenines, how many cytosines, guanines, and thymines must it have?
If a given strand is made up of 100 base pairs and has 32 adenines, the number of thymine is equal to adenines, so the strand will have 32 thymine.
This rule is base on Chargaff's rules that tells that the DNA of any individual species or any organism, amount of guanine must be equal to the amount of cytosine and the amount of adenine must be equal to the amount of thymine. Hence, we can say that ratio of purine and pyrimidine bases should exists in form of A+G=T+C or 1:1 stoichiometric ratio.
According to Chargaff's rule in a DNA molecule A = T and G = C and A + G + C + T = 100%. Cytosine will always pairs with guanine, and their percentages must also be equal. Sum of all four percentages of purine and pyrimidine must equal 100%.
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Which are the answers ?? Help pls
Answer:
saassaa
Explanation:
Salt is notoriously dangerous to land snails; however, some populations of aquatic, freshwater snail have
brackish (or mix of salt and fresh water) water adaptations and live in different parts of a river system. A
group of scientists monitored salt concentrations in the habitats of two freshwater snail populations located
nearby and recorded the salt level as follows (in ppt, parts per thousand):
Population (Day 1): 0.1 ppt (morning), 0.0 ppt (afternoon), 0.1 ppt (evening)
Population 2 (Day 1): 0.3 ppt (morning), 0.5 ppt (afternoon), 0.2 ppt (evening)
In 3-5 sentences, 1) describe in which population you'd expect to see more adaptations for salt water and
2) explain how such adaptations would become more common in this population.
Given that members of population 2 are exposed to higher levels of salt than members of population.
How salt water will affect the population?1, I would anticipate seeing more adaptations to salt water in this population.
Population 2 members need to adapt to their surroundings better in order to survive and gain fitness.
2) Describe how such adaptations would proliferate within this population.
Natural selection will favor adaptations for salt water, and these traits will be more prevalent in the population.
Let's go through a few aspects of natural selection.
Benefitful alleles are chosen by natural selection, which acts as an evolutionary force, and their frequency is increased in the population.
Gene destiny in space and time is the outcome of the phenotype-environment interaction.
Natural selection produces adaptation, thus. a rise in the aptitude phenotype is the result.
Each genotype's contribution to the following generation is what is referred to as aptitude.
The phenotype, which affects a person's survival, fertility, and capacity to mate, is a reflection of their aptitude (or fitness). It serves as a method of evaluating a person's capacity to produce viable offspring.
In order for aptitude to be advantageous, it must be significant.
Depending on how an allele impacts the fitness of people, natural selection may act in its favor or against it.
The environment or the selective forces exerted by other organisms or habitats can often be linked to adaptations brought about by natural selection.
The environmental feature that affects how differently phenotypic individuals survive is the selecting agent.
Each genotype's likelihood of passing on its gametes to the following generation is influenced by the environment.
Recall that a mutation is an adjustment or modification of DNI sequences that results in the emergence of new variants.
Some of these might be successful and be absorbed into each person, though many of these are eliminated. It is these mutations that have undergone natural selection.
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which of the following is evidence that would support the claim that DNA has been transcribed into RNA
Answer:
a DNA sequence ACGGGTAAGG will be transcribed into the mRNA sequence UGCCCAUUCC.
Explanation:
acacia inherits a variety of genes from both of her parents. these genes combine and interact with each other, some increasing her chance of developing bipolar disorder, some possibly reducing her chances. this overall pattern of genetic inheritance for the mental disorder is called what?
Polygenic refers to the overall pattern of genetic inheritance for the mental disease.
Describe polygenic.A trait that is influenced by two or more genes, such as height or skin tone, is referred to as a polygenic trait. Polygenic traits do not follow the laws of Mendelian inheritance since several genes are involved. Humans have three polygenic traits: height, skin tone, and eye color. Multiple genes control these features.
Etiological diagnosis:Etiology is the study of origin or cause. In epidemiology, etiology is crucial for determining the origin and causation of a disease. It is possible to intervene in the treatment and prevention of contagious, communicable, and non-communicable diseases by taking into account their etiological conditions.
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With an appearance similar to granite this sample seems to have undergone a change where the ferro-magnesium minerals have separated from the silica rich minerals. This ion-migration has produce what appears to be a foliated texture.
This sample likely underwent a process known as metamorphism, in which heat and pressure cause the minerals in a rock to recrystallize and change.
Metamorphism is the process of change in the structure, mineralogy, texture, and chemical composition of rocks in the solid state, as a result of changes in temperature, pressure, and/or deformation. It occurs in the Earth's crust and upper mantle and can be caused by tectonic activity, such as the movement of tectonic plates, or by exposure to heat and fluids from intrusions of magma or hot fluids.
The specific process you described, where ferromagnesian minerals have separated from silica-rich minerals, is known as segregation. This can result in a foliated texture, where the minerals are aligned in parallel layers. This is often seen in metamorphic rocks such as schist and gneiss.
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Which sea is the saltiest natural lake and is also at the lowest elevation on the face of the earth?
Answer:
Death Sea. Among the lakes in the globe, the Dead Sea is distinctive. With a salinity of 34%, it is the saltiest body of water in the whole globe.
Explanation:
What type of artificial selection is used when animals with desired characteristics are mated to produce offspring with those desired traits?
Selective breeding type of artificial selection is used when animals with desired characteristics are mated to produce offspring with those desired traits.
Selective breeding, also known as artificial selection, is the process by which humans use animal breeding and plant breeding to selectively develop specific phenotypic traits (characteristics) by deciding which typically animal or plant males and females will sexually reproduce and produce offspring together. Domesticated animals are known as breeds and are often bred by a professional breeder, whereas domesticated plants are known as variations, cultivars, or breeds. A crossbreed is created when two separate purebred animals of the same breed crossbreed, and hybrid plants result from this crossbreeding. Major crops are typically the result of professional breeding; amateurs and professionals alike may breed flowers, vegetables, and fruit trees.
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mammal a has twice the body mass of mammal b. what is the ratio of mammal a's specific brain mass to mammal b's? report your answer using two significant figures.
They have more fully developed brains than other animals, with a ratio of mammal A's particular brain weight to mammal B's equal to 1.624.
Can mammals include humans?Since humans share the same distinguishing characteristics as every other member of this vast group, they are categorized as mammals. Humans are also included in the category of mammals known as primates, which includes the apes and, in particular, the "Great Apes" '
A mammal or a shark?Although some people mistakenly think that sharks are mammals because of their size and the fact that some of them can bear children to live young, sharks are actually fish. Fish are aquatic creatures and some of the earliest vertebrates.
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ap bio unit 3 examleave the first ratingterms in this set (58)what is the term for metabolicpathways that release storedenergy by breaking downcomplex molecules.
Catabolism is the metabolic pathway that releases stored energy by breaking down complex molecules.
There are two types of metabolisms: anabolism and catabolism. Something is synthesized in anabolism, whereas catabolism performs the exact opposite of anabolism.
The breakdown of complex molecules into simpler ones by catabolic pathways typically results in the release of energy. In catabolic pathways, the energy that is stored in the bonds of complex molecules like glucose and fats is released.
The catabolic, or respiration-driven breakdown of complex organic molecules into water and carbon dioxide results in the storage of released energy in ATP molecules.
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experiments involving the cloning of dna encoding for a low ld50 toxin or work with vectors that express toxins with a low ld50 (less than 100 nanograms per kilograms body weight) fall under what section of the nih guidelines?
Answer:
Experiments involving the cloning of DNA encoding for a low LD50 toxin or work with vectors that express toxins with a low LD50 (less than 100 nanograms per kilograms body weight) fall under Section III-F-2 of the NIH Guidelines for Research Involving Recombinant or Synthetic Nucleic Acid Molecules. This section states that experiments involving the cloning of DNA encoding for a low LD50 toxin or work with vectors that express toxins with a low LD50 pose extreme biosafety risks, and must be conducted in the highest level of containment (BSL-4).
The cloning of DNA encoding for a toxin with a low LD50 falls under Section III-D-4 of the NIH guidelines. This section outlines provisions for research involving dangerous biological agents. Lower LD50 values indicate higher toxicity levels.
Explanation:Experiments involving the cloning of DNA encoding for a toxin with a low LD50, or work with vectors that express such toxins, fall under the Section III-D-4 of the NIH guidelines. This section is specifically for research involving dangerous biological agents. The LD50 or Lethal Dose 50% measure is used to denote the lethal dose of a substance which can kill 50% of a test population. It's mainly a measure of a substance's toxicity.
A lower LD50 value refers to a higher toxicity level because it requires a smaller amount to cause harm. Therefore, if you're working with vectors that can express toxins with an LD50 of less than 100 nanograms per kilogram body weight, you're working with a highly toxic material, and your experiments must strictly adhere to the guidelines under Section III-D-4 of the NIH Guidelines.
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