Answer:
answer is D
Explanation:
radius of veins is much greater than radius of arterioles
temperture does not affect blood flow
what is thought to cause the 1 ms inactive time after a sodium channel initiates an action potential?
The sodium channels that once initiate an action potential remain inactivated for a brief period after being open due to the absolute refractory period.
In neurons, the absolute refractory period occurs for a fraction of a millisecond to ensure that another action potential does not start immediately. This period occurs due to the inactivation of sodium ion channels that generally opens to depolarise the membrane. After the sodium channel gets back to resting conformation i.e., sodium channels remain inactivated until the membrane is hyperpolarised. Then sodium channel is activated to start a new action potential.
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There are 61 mrna codons that specify an amino acid, but only 45 trnas. This is best explained by the fact that ________.
Answer:
the rules for base pairing between the third base of a codon and tRNA are flexible.
Explanation:
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What are the two products of photosynthesis? What is the purpose of each product?
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
Explanation:
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What are some limitations that exist with the use of induced pluripotent stem cells?.
Immune incompatibility between the recipient and the donor cells is the first restriction.
What purpose does a cell serve?The corresponding value of all living things are cells. There are numerous trillions of neurons in a body. They give the body structure, absorb nutrients from meals, turn those into energy, & perform certain tasks.
What is the cell's structure?The cellular membranes, the nucleus, as well as the cytoplasm are the three components that make up a cell. Intricate arrangements of microscopic fibers or tens or even hundreds of tiny, unique structures known as organelles can be found in the cytoplasm.
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What is an important conclusion of climate prediction models temperature changes?.
The fact that the temperature increase will continue to rise but can be slowed down is one of the key findings of climate forecasts about temperature fluctuations.
To anticipate climatic changes on Earth, scientists mostly use climate prediction models. The information on past and prospective climate changes are provided by these models.
Weather forecast models employ measurement techniques to depict the interplay of major driving factors such as the atmosphere, seas, terrain, and snow.
The climate prediction model's major finding is that human activity drives up global warming and average global temperatures. This may be lessened by the extensive measures done to stop global temperatures from rising.
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what are relative importance of human biology, lifestyle, the environment, and medical care in contributing to the health of the population.
A relatively important aspect of human biology is genetics.
Genetics is very important in public health, lifestyle, environment, and treatment of medical conditions. Therefore, it is important to lead a healthy life such as exercise, a healthy diet, and mental health to maintain physical and mental health.
The environment also influences this aspect. A healthy and pollution-free environment keeps people healthy and prevents the transmission of diseases such as respiratory diseases and infectious diseases caused by such pollution.
The provision of medical services is also important for maintaining the health of the population. Proper medical treatment in case of illness is very important to restore the health of the population.
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Answer:
Explanation:
The health field concept:
According to the “Health field” concept. There are four major determinants of health or ill health.
A. Human Biology
Every Human being is made of genes. In addition, there are factors, which are genetically transmitted from parents to offspring. As a result, there is a chance of transferring defective trait. The modern medicine does not have a significant role in these cases.
a. Genetic Counselling: For instance during marriage parents could be made aware of their genetic component in order to overcome some risks that could arise.
b. Genetic Engineering: may have a role in cases like Breast cancer.
B. Environment: is all that which is external to the individual human host. Those are factors outside the human body. Environmental factors that could influence health include:
a. Life support, food, water, air etc.
b. Physical factors, climate, Rain fall
c. Biological factors: microorganisms, toxins, Biological waste,
d. Psycho-social and economic e.g. Crowding, income level, access to health care
e. Chemical factors: industrial wastes, agricultural wastes, air pollution, etc
C. Life style (Behaviour): is an action that has a specific frequency, duration, and purpose, whether conscious or unconscious. It is associated with practice. It is what we do and how we act. Recently life style by itself received an increased amount of attention as a major determinant of health. Life style of individuals affects their health directly or indirectly. For example: Cigarette smoking, unsafe sexual practice and eating contaminated food
D. Health care organisation
Health care organisations in terms of their resource in human power, equipment, money and so on determine the health of people. It is concerned with;
a. Availability of health service: People living in areas where there is no access to health service are affected by health problems and have lower health status than those with accessible health services.
b. Scarcity of Health Services leads to inefficient health service and resulting in poor quality of health status of people.
c. Acceptability of the service by the community
d. Accessibility: in terms of physical distance, finance etc.
e. Quality of care that mainly focuses on the comprehensiveness, continuity and integration of the health care.
An organelle is the basic unit of structure and organization in organisms
TRUE
or
FALSE
Answer: FALSE.
Explanation: It would be cells, because of cell theory. (Cells make up all basic units of life.)
Answer:
False
Explanation:
A CELL is the basic unit of structure and organization in organisms.
An organelle is a part of the cell that serves various functions depending on what type of organelle it is.
During which phase of mitosis do the sister chromatids separate and head towards opposite poles of the cell?.
Mitosis do the sister chromatids separate and head towards opposite poles of the cell during anaphase.
During anaphase, sister chromatids (or homologous chromosomes for meiosis I), will separate and flow to contrary poles of the cell, pulled via way of means of microtubules. In nondisjunction, the separation fails to arise inflicting each sister chromatids or homologous chromosomes to be pulled to 1 pole of the cell.
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For mammals living in cold habitats, would smaller or larger species require relatively thicker fur?.
For mammals living in cold habitats, smaller species would require relatively thicker fur.
The majority of vertebrate animals have an increase in body mass as they approach the poles. In the colder climes found at high latitudes and elevations, many species of animals benefit from being larger. A phenomenon known as Bergmann's Rule describes how heavier animals have a smaller surface area to volume ratio, which helps prevent heat loss.
Numerous (non-polar) animals are ectotherms, which means that their internal heat production is so low that they are dependent on their environment to warm them up to a temperature where their body and enzymes can function well enough for an active and functional life. Because they have a larger relative surface area to lose heat from, smaller animals do poorly in cold climates.
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True or False
farming / ranching (growing animals)
produce more air pollution than all
transportation (cars, planes, etc...)
True
False
Yes, farming/ranching (growing animals) produce more air pollution than all transportation (cars, planes, etc..)
How does the ranching of animals produce more hydrocarbons?When the environmental impact of their feed is taken into consideration, cows, pigs, and other farm animals in Europe produce more greenhouse gases annually than all of the cars and vans in the continent combined, according to a new analysis by Greenpeace. However, while governments have focused their climate policy on renewable energy and transportation, efforts to lessen the impact of food and farming on the climate have lagged. This is because of the increase in meat and dairy products in Europe over the past ten years.
Livestock on EU farms (including the UK) was responsible for the equivalent of around 502 million tonnes of carbon dioxide annually in 2018, the most recent year for which precise data is available from the UN Food and Agriculture Organization. This carbon dioxide was primarily released as methane. In contrast, 656 million tons of carbon dioxide were produced by European vehicles and vans in the same period.
The overall annual emissions are equal to 704 million tonnes of carbon dioxide when the indirect greenhouse gas emissions are considered. This is done by estimating the deforestation and land use changes related to the production of animal feed. Between 2007 and 2018, the EU's output of meat and dairy increased by 9.5%, which, according to Greenpeace, resulted in an increase in emissions of 6% annually, or nearly 39 million tons. This would be the same as adding 8.4 million new cars to the road.
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I need help on this please and thank you
Answer:
NH4has a positive charge and sticks to soil particles.
Explanation:
I looked the answer up on quizzez lol good luck :)
Why will the microbiota in the vagina of a woman of reproductive age differ from that of the same woman before puberty and after menopause?.
The microbiota in the vagina of a woman of reproductive age differs from that of the same woman before puberty and after menopause due to menstruation.
Menstruation causes monthly changes in the bacterial community in the vagina during the reproductive years. The vagina is mostly colonized by Lactobacillus acidophilus before puberty and after menopause, which ferments to create an acidic environment.
Lactobacillus acidophilus ferments significant amounts of glycogen in the vagina to produce lactic acid, creating an acidic environment during the reproductive years. Before and after menopause, glucose is absent.
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In a human ovary, an oocyte is supported by _______ cells and after the first meiotic division is _______.
In a human ovary, an oocyte is supported by follicular cells and the product formed by the primary oocyte after the first meiotic division is the secondary oocyte.
Oogenesis is the process through which an ovum (egg cell) differentiates into a cell capable of developing further when fertilised. It grows through maturation from the original oocyte. The embryonic stage is when oogenesis begins. Oocytogenesis, the conversion of oogonia into primary oocytes, is the first step in the process of generating primary oocytes, which is the beginning of oogenesis. Only one mature oocyte and three additional cells known as polar bodies will emerge from a single oogonium. Before or soon after conception, oocytogenesis is finished.
The first meiotic division begins before the female foetus is delivered and is finished in the tertiary follicle of the ovary. When a sperm and an ovum fuse, the secondary oocyte's meiotic division is finished. The secondary oocyte starts the second meiotic division but then arrests once more. If a sperm fertilises it, it will finish the division, producing a mature ovum and another polar body.
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Complete question:
In a human ovary, an oocyte is supported by _______ cells and the product formed by the primary oocyte after the first meiotic division is the _______.
Try to guess my zodiac sign.
Answer:
libra.............. maybe
Explanation:
which muscle is highlighted? subclavian internal intercostal innermost intercostal splenius cervicis
anterior scalene muscle is highlighted subclavian internal intercostal innermost intercostal splenius Cervicis .
Musculus splenius cervicis is one of the deep (or intrinsic) muscular tissues of the cervical and thoracic backbone. Its fibres run superiorly and laterally. It assists in ipsilateral cervical side flexion and rotation, when both splenius Cervicis muscle tissues settlement they expand the cervical backbone.
Take a seat on a chair and allow the head drop forward as an awful lot as feasible. region one or both hands on the pinnacle so the fingertips are touching the cranium bone. Exhale and practice stress progressively to deepen the stretch inside the returned of the neck. preserve the location for a pair minutes.
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Which molecules have been synthesized in experiments similar to the ones performed by miller and urey?.
Amino acids are the chemicals that have been created in studies comparable to those carried out by Miller and Urey.
Harold C. Urey and Stanley L. Miller conducted an experiment to explain the beginning of life on Earth. They thought that the inorganic minerals that made up the early earth's environment may have created amino acids. They used the gases that the two biologists' thought were in the early earth's atmosphere: methane, water, hydrogen, and ammonia. The chemicals were cycled inside the system in sterile glass flasks and tubes that were connected in a loop.
The experiment fell short of explaining how proteins were in charge of creating amino acids. Some scientists disagree, claiming that the gases utilised by Miller and Urey are not as plentiful as the experiment indicates. They believed that the atmosphere is made up of gases like oxygen, nitrogen, and carbon dioxide that are emitted during volcanic eruptions. The outcomes are therefore unreliable.
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What is the end result of meiosis for identical daughter cells?.
Answer:
four identical daughter cells, each with half the number of chromosomes as the parent cell
Explanation:
What are the 2 ways a channel can be made? (science)
Glaciers that carved down large gorges between two continental masses are thought to be responsible for some of the channels.
Where do channels come from?Glaciers that carved down large gorges between two continental masses are thought to be responsible for some of the channels. People typically dig channels out of the bottom of shallow waterways so that large ships can travel through them. They are referred to as navigation channels.A canal is a man-made waterway that enables ships and boats to move between different bodies of water. Water is also transported through canals for human purpose, including irrigation.Although a strait and a channel both join two bodies of water, a channel is frequently wider. A sound is similar to a strait but wider. Normally, islands are separated from other bodies of water by a channel. Though they are frequently used synonymously.To learn more about Canal refer to:
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ferns are simultaneously involved in promoting rock weathering, while preventing soil erosion. explain how a single plant can perform both these functions, and how these functions are beneficial to its ecosystem.
Ferns are beneficial to their ecosystem because they help promote rock weathering and prevent soil erosion.
They do this by absorbing water and nutrients from the soil, which helps to break down rocks and keep the soil in place. This is beneficial because it helps to keep the ecosystem healthy and balanced.
Ferns are a type of plant that is known to be very effective at promoting rock weathering, while also preventing soil erosion. One of the ways that ferns promote rock weathering is through their root systems. Ferns have a very dense root system that is very effective at breaking up rocks and promoting the weathering process. In addition, ferns also release a variety of acids and chemicals from their leaves that can help to break down rocks.
Ferns are also very effective at preventing soil erosion. This is because their root systems help to hold soils in place, while their leaves help to trap water and prevent it from running off. In addition, the dense canopy of a fern can help to protect the soil from the sun and wind, which can further help to prevent erosion.
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a population of coues deer inhabiting the american southwest and northern mexico are separated by an impassible fence. over time, these populations adapt and diverge to the extent that they are no longer able to interbreed and produce fertile offspring. this is best described as an example of:
Coues deer that live in the American Southwest and northern Mexico are cut off from each other by an impenetrable fence, and as a result, they can no longer interbreed and give birth to fertile offspring. This is a prime illustration of allopatric speciation.
When a species divides into two distinct groups that are isolated from one another, allopatric speciation takes place. They can't breed with one another because of a physical barrier, such a mountain range or a waterway. Based on the requirements of their particular habitat or the genetic traits of the group that are passed on to offspring, each species grows differently.
Hence, Coues deer development into distinct species is example of allopatric speciation.
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vitamin b6 is a coenzyme for plp which plays a role in the process of making nonessential amino acids. this process is termed .
Vitamin B6 is a coenzyme for PLP which plays a role in the process of making nonessential amino acids. This process is termed as transamination.
Vitamin B6 is also called pyridoxine. It is a water soluble vitamin that is naturally present in various food items as well as can be synthetically made in lab as well. The food containing the vitamin are poultry, fish, potatoes, chickpeas, bananas, etc. The vitamin is essential for keeping the nervous system and immune system healthy.
Transamination is the chemical reaction where an amino group is transferred to a keto-acid to form new amino acids. This pathways also deaminates various amino acids.
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keeping food cold would seem to promote the growth of psychrophilic bacteria. why are we generally less concerned about this than we are about mesophilic bacteria?
Keeping food cold would seem to promote the growth of psychrophilic bacteria. Population density is smaller for psychrophiles than for mesophiles.
Psychrophilic bacteria include Gram-terrible genera inclusive of Pseudoalteromonas, Moraxella, Psychrobacter, Flavobacterium, Polaromonas, Psychroflexus, Polaribacter, Moritella, Vibrio, and Pseudomonas; Gram-nice genera such as Arthrobacter, Bacillus, Micrococcus species; microalgae inclusive of Chlamydomonadales and
Psychrophiles are extremophilic bacteria or archaea that are cold-loving having an most fulfilling temperature for increase at approximately 15°C or lower, a maximal temperature for boom at about 20°C and a minimum temperature for boom at 0°C or decrease.
Psychrotrophic micro organism grow at less than 7°C. commonplace species in cold saved milk, that is the storage norm in most jurisdictions, are Micrococcus, Bacillus, Staphylococcus, Pseudomonas, Flavobacterium, and coliforms. Pseudomonas spp. are the most common and commonly have the greatest effect on first-class.
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how can a single sequence variant have different effects on the amino acid sequence across the transcript variants of a gene
Amino acids are coded by the triplet sequence of mRNA. There are various property of these genetic triplet codon protein is made up of amino acids.
If a single base is altered in DNA, then it could have diverse outcomes at the transcript variations of the gene, beneath are the alternatives listed: Silent mutation- the mutation does now no longer regulate the amino acid series and consequently has no effect.
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Scientists have categorized trees based on whether they keep or lose their leaves each year. Another logical way to categorize trees is based on the.
Another logical way to classify trees is by the type of fruit they produce.
What is Fruit?
A fruit is the structure that contains seeds after flowering in blooming plants. Flowering plants spread their seeds via their fruits.
A fruit is a mature, ripened ovary along with its contents. The ovary is the reproductive structure in the plant flower that contains the ovules. From the earliest stages of flower development until the ovules become fertilized and turn into seeds, the ovary encloses and protects the ovules.
Fruits are high in dietary fiber, vitamins (particularly vitamin C), and antioxidants. Although fresh fruits spoil quickly, their shelf life can be extended by refrigerating them or removing oxygen from their storage or packaging containers.
Fruits can be juiced, jammed, and jellied, and then preserved through dehydration, canning, fermentation, and pickling.
Waxes derived from bayberries (wax myrtles), as well as vegetable ivory derived from the hard fruits of a South American palm species (Phytelephas macrocarpa), are important fruit-derived products. Morphine, for example, is derived from the fruit of the opium poppy.
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Describe how you would investigate the distribution of a nitrogen loving lichen and a nitrogen sensitive lichen at different distances into a wood from a main road
According to the given statement Quadrat and Count the amount of lichens on trees and Set regular intervals.
What do lichens do for humans?Lichen, for instance, can give animals like birds, mammals, and insects food, shelter, and materials for nests. Additionally, lichens have been utilized to make fabrics, medicines, and human food. They also create a special chemical that shows promise as an antibiotic, anti-cancer, and antioxidant.
Are lichens dangerous to people?Lichens are not all harmful to people. Bryoria is one lichen species that both people and animals eat. However, some species, like wolf lichens, are toxic and were used among Native American tribes to poisoning their arrowheads. Lichens can therefore be both helpful and harmful to people.
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q024) snrnas a. are removed by the spliceosome during rna splicing. b. are translated into snrnps. c. are important for producin
snRNAs can bind to specific sequences at intron-exon boundaries through complementary base-pairing.
What are snRNAs and what is the specifity in the RNA with soluble features?Before the mRNA , there is a phase where the preparation of pre mRNA takes place , and that is done by snRNA.Basically snRNA is used to catalyze the splicing of pre mRNA and are made of many proteins to form RNA protein.RNA is ribonucleic acid and is the primary genetic complement of many organisms and also sometimes it consist of single strand as a genetic complement.It is true that snRNAs are removed by the spliceosome since the formation of pre mRNA is done by then the snRNAs are removed.Also snRNAs are translated to snrnps in the spliceosome along with the associated proteins.To know more about RNA visit:
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Stuart runs with his brother each morning, and they can only speak one or two words at a time between multiple deep breaths. Which best describes their heart rates during this activity?.
Vigorous is the one that describes their heart rates during the activity. in medical terms it is the tachycardia
What is tachycardia?
Tachycardia is the medical term for a heart rate over 100 beats a minute. Many types of irregular heart rhythms (arrhythmias) can cause tachycardia. A fast heart rate isn't always a concern. During exercise, it is common breath and heart rate increase because the body requires more oxygen for the muscles and the whole body. Additionally, the higher the effort is the more the heart rate changes. In the case of running or jogging, this physical activity requires considerable effort and due to this, it leads to an important increase in the heart rate or a vigorous heart rate.
Indeed during this activity, the heart rate can go as high as 200 bpm (beats per minute) but during rest heart rate is between 60-100 bpm. Thus, heart rate while Stuart and his brother run can be described as vigorous.
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Answer: C
Explanation: i did the exam
Where in the eukaryotic cell would you expect to find transcripts with intron sequences?.
You would anticipate a nucleus in a eukaryotic cell.
Describe a cell.The simplest form that can sustain life itself and makes up most living things, including the body's tissues. The cellular membranes, the nucleus, and also the cytoplasm are the three primary components of a cell. The substances that enter and leave the cell were governed by the cell membrane, which encloses the cell.
What does a cell do?They give the body structure, absorb nutrients from meals, turn those nutrients into energy, & perform certain tasks. Additionally, cells have the ability to replicate themselves and store the body's genetic material.
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FILL IN THE BLANK. the key feature of ___ tolerance is that regulatory cells can suppress autoreactive lymphocytes that recognize a variety of different self antigens if the antigens are from the same tissue or are presented by the same antigen-presenting cell.
The main characteristic of T cell tolerance is that if the self antigens are from the same tissue or are presented by the same antigen-presenting cell, regulatory cells can suppress autoreactive lymphocytes that identify a variety of distinct self antigens.
What does the immune system mean by self-tolerance?The immune system's capacity for self-tolerance is its capacity to see its own antigens as non-threats while appropriately mounting an attack against alien substances. Normal physiological function and general health depend on this equilibrium of immune defense and self-tolerance.
Which antigen-presenting cell receptors on the helper T cell identify the antigen?T-helper cells exhibit the surface receptor known as the T cell receptor, which is made up of a polypeptide heterodimer (marked, for example,α/β). T helper cells are able to identify viral peptides in conjunction with class II MHC proteins, which are typically found on an antigen-presenting cell's surface (APC).
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Which mechanism is the best explanation for how the stem cell-derived inhibitor might arrest the cancer cell cycle at the g1 stage?.
The best explanation for how the stem cell-derived inhibitor might arrest the cancer cell cycle at the g1 stage is that the inhibitor prevents the cancer cells from dividing. This halt in cell division allows the body to repair any damaged DNA and prevent the cancer cells from spreading.
In addition, The inhibitor might also kill cancer cells by inducing apoptosis, or programmed cell death. Apoptosis is a process by which cells self-destruct in a controlled manner. Cancer cells often avoid apoptosis, which allows them to continue growing and spreading. However, the inhibitor might cause cancer cells to undergo apoptosis, leading to their death. This could help to control the growth of cancer and possibly even lead to a cure.
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