Option 1 is Correct. Genetic variety is most likely to be reduced by stabilizing selection.
Both inbreeding and drift decrease genetic diversity, which has been linked to a higher risk of population extinction, a slower rate of population growth, a decreased capacity to adapt to environmental change, and a decreased capacity for disease resistance, all of which have an effect on the ability of individuals who have been released to the wild to survive.
By favoring or rejecting a given gene or gene combination, natural selection can reduce genetic variation in populations of organisms (leading to directional selection). When natural selection favors an average phenotype and excludes extreme deviations, stabilizing selection reduces the genetic variance of a population.
When exposed to environmental changes, a population's genetic variation shifts toward a new phenotype, which is known as directional selection.
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Correct Question:
Which of the following is most likely to decrease genetic variation?
1. stabilizing selection
2. diversifying selection
3. mutation
4. directional selection.
A/an _________________________ is the surgical removal of a nephrolith through an incision in the back.
Nephrolithotomy is the surgical removal of a nephrolith through an incision in the back.
These procedures are treatments for kidney stones that are used in patients with large or irregularly shaped kidney stones, people with infections, stones that have not been broken up enough by SWL (extracorporeal shock wave lithotripsy) or those who are not candidates for another common stone treatment, ureteroscopy.
Stones bigger than 2 cm (the size of a marble) require this procedure.
Procedures involve entering the kidney through a small incision in the back. Once the surgeon gets to the kidney, a nephroscope (a miniature fiberoptic camera) , threaded in through the hole.
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It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
Yes. It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
The human upper respiratory tract serves as a reservoir for a diverse community of commensals and potential pathogens, such as Haemophilus influenzae, Moraxella catarrhalis,etc. which can occasionally develop into pathogens and cause infectious diseases. Viruses are responsible for the majority of upper respiratory tract infections.
Nasal hairs are used to catch debris. Particles are propelled upward and out of the respiratory tract by cilia on the epithelium of the trachea and bronchi. The respiratory system has a feature that guards against infections.
Therefore, It is common for a normal, healthy individual to carry potentially pathogenic organisms in their upper respiratory tract.
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Positive selection tests to see if the ______ of a T-lymphocyte can recognize and bind to an MHC molecule.
Positive selection tests to see if the TCR of a T-lymphocyte can recognize and bind to an MHC molecule.
What is a T-lymphocyte?A T-lymphocyte is a special type of immune cell that is generated inside the bone marrow.
The T-cell receptor (abbreviated as TCR) is a protein located on these immune T lymphocytes.
In conclusion, Positive selection identifies if the TCR of a T-lymphocyte can recognize and bind to an MHC molecule.
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If the planet was attacked by a disease that caused people to lose the use of their frontal lobes, one way people might be affected is they may
If the planet was attacked by a disease that caused people to lose the use of their frontal lobes, one way people might be affected is they may lose their self awareness.
What is Brain?
This is an organ which is located in the head region and comprises of rich network of neurons which are enclosed in the cranium. It serves as the control center of the central nervous system and has different types of lobes such as frontal etc with unique functions.
The frontal lobe is located in the anterior part of the brain and is responsible for different types of voluntary movements and cognitive functions such as interaction, self awareness etc.
This is therefore the reason why frontal lobe was chosen as the most appropriate choice.
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What are small area variations? a. geographic variations in health care practice b. demographic variations in health care practice c. both a and b d. neither a nor b
Small area variations are geographic variations in health care practice. That is option A.
What are geographic variations?In the health sector, geographic variations are a type of variations that involves the observation of small area using population-based medical services across the relatively small geographic areas.
The importance of geographic variations in health care practice include the following:
It helps in monitoring disease outbreaks,It targets public health strategies towards a particular disease.It saves cost for health care delivery servicesIt makes health care delivery services available for the populace.Learn more about variations here:
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The type of bacteria that rarely shows any active motility is known as _____.
a. pus
b. cocci
c. flagellum
d. spirilla
Cocci bacteria are rarely motile.
Coccus or cocci bacteria are round or sphere-shaped bacteria. They lack flagella or any locomotive organ so they are non-motile.
Cocci contain multiple genera like Streptococcus, Staphylococcus, Enterococcus and Diplococcus. They are divided based on the pattern they grow. For instance, Diplococcus always appears as joined two cells implying a pair of cells.
They can also be both gram-positive bacteria (eg. Neisseria spp.) and gram-negative bacteria (eg. Streptococcus spp.).
They can show pathogenicity, symbiotic and commensalism. Some of the pathogenic cocci bacteria are Streptococcus, Staphylococcus and Pneumococcus which can cause throat infection, food poisoning and pneumonia respectively.
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Why is it difficult to test the sensory and learning abilities of a newborn?
Vision is the least developed sense at delivery as a womb is a dark location and there may be little possibility for development. Vision, like hearing, does increase unexpectedly over the early years of an infant's lifestyle.
The infant can see and hear what is happening around her and can communicate her desires and interests to others. mother and father can help their infants study with the aid of gambling with them. Infants have the ability to see faces and items of different shapes, sizes, and colors.
For infants, learning the senses is crucial for discovering the arena around them. Whilst toddlers see the face of a parent, they smile. They coo once they listen to a parent's voice or pull away from something hot after they contact it. If infants odor something terrible, they shrink back.
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Suppose your gram-stained a sample from a pure culture of bacteria and observed a field of red and purple cocci. Adjacent cells were not always the same color. What would you conclude?
If after gram-staining a pure bacterial culture red and purple cocci are observed and the adjacent cells were not of the same colour, It means it's an old stock of culture.
The Gram stain process is a multi-step differential staining procedure. Differential staining separates organisms based on how they respond to various stains. To put it another way, two organisms in a sample that has been stained differently might appear to be different colours.
Gram-positive and Gram-negative are the two primary subtypes of bacteria. Based on how these bacteria respond to the Gram stain, several types are identified. The hue of a Gram stain is purple. The bacteria in a sample will either stay purple or change pink or red when the stain and bacteria interact.
The bacteria are Gram-positive if they continue to be purple.
The bacteria are Gram-negative if they turn pink or crimson.
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Translation begins when mrna becomes associated with?
Answer:
Translation begins when an mRNA connects to the small subunit of a ribosome.
Explanation:
Connected to the tRNA of the start codon is an amino acid, called f-Met. Once the f-Met tRNA binds to the small subunit of the ribosome, the large subunit of the ribosome binds to the small unit, and translation is ready to begin. Therefore, translation begins when an mRNA connects to the small subunit of a ribosome.
what is nanotechnology ?
Answer:
Nanotechnology is the branch of technology that deals with making structures that are less than 100 nanometres long. Scientists often build these structures using individual molecules of substances.
What evidence was provided for localized functions inherent to specific anatomical brain structures during execution of behavior and mental processes?
The fMRI is now the most commonly used method of learning about brain structure.
Functional magnetic resonance imaging (fMRI) is a type of brain scan that uses a magnetic field to create images of brain activity in each brain area.
The fMRI detects the amount of blood flow in each brain region, and thus is an indicator of neural activity. Very clear and detailed pictures of brain structures can be produced via fMRI.
The advantage of the fMRI is that it is noninvasive, fMRIs are substantial and they are now available in many university and hospital settings. The fMRI is now the most commonly used method of learning about brain structure.
Our words are bound by an invisible grammar which is embedded in the brain.
-Jonah Lehrer, in Proust Was a Neuroscientist.
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___occurs as the earth comes out of an ice age.
o a. magnetic deviation
o b. polar deviation
o c. global warming
o d. global cooling
In order to prevent accidental needle stick injury and potential exposure to infectious agents, what should you do with needles and needle-containing devices?
In order to prevent accidental needle stick injury and potential exposure to infectious agents, some preventive measures should be taken like use of alternatives, proper disposal of used needles, proper management, avoid spills, take common precautions, participate in education programme etc.
Preventive measures are:
1) When safe and efficient alternatives are available, avoid using needles.
2) Recapping or bending needles that could be infected is not advised.
3) Bring sharps containers with standard labels that are impervious to leaks and punctures to clients' houses. Don't assume there will be any such containers. Sharps and used needles that could be contaminated should be promptly disposed of in the containers.
4) Before using, make a plan for the proper management and disposal of needles.
5) Containers for sharps should be kept out of children's, pets', and other people's reach.
6) Transport used sharps containers securely to avoid spills.
7) Consistently observe common precautions, infection prevention, and hygiene standards.
8) Participate in the bloodborne pathogens education programme offered by your workplace.
Hence, In order to prevent accidental needle stick injury and potential exposure to infectious agents, these preventive measures should be taken.
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A particle that is 1.0 mm in diameter traveling in a stream at 100mm/s
a transport
b settle
c erode
d deposit
A. A particle that is 1.0 mm in diameter traveling in a stream at 100mm/s is being transported.
Transportation of particles by stream
The transportation of particles by stream is movement of particle of certain size by the force of the stream.
Transportation of particles can occur by saltation and by traction .
A particle that is 1 mm in diameter can easily be transported by a stream moving at 100 mm/s.
Thus, a particle that is 1.0 mm in diameter traveling in a stream at 100mm/s is being transported.
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Answer:
b. settle
Explanation:
The enteric division of the ans is found in the __________ of the body
The enteric division of the ANS is found in the gastrointestinal tract of the body.
Here ANS stands for the autonomic nervous system which can be described as a collection of motor neurons that regulates involuntary physiologic processes including heart rate, blood pressure, respiration, digestion, and sexual arousal.
It has three divisions: sympathetic, parasympathetic, and enteric.
Out of three, the enteric division has two plexuses: the myenteric (Auerbach) which is usually detected in the GI tract, and the submucosal (Meissner) which is usually observed in the submucosa.
The sympathetic division is located in intermediolateral columns, or lateral horns, of the spinal cord whereas the parasympathetic division is located in the head.
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A neurotransmitter binds to a metabotropic receptor and pka is ultimately activated, which type of neurotransmitter likely bound?
A Final statement or concluding statement
Adrenergic neurotransmitter is likely to bound.
What neurotransmitter activates adrenergic receptors?The neurotransmitter norepinephrine (NE) is released by adrenergic nerves and binds to specific receptors in the target tissue to produce physiological responses. The binding of neurotransmitters to receptors activates signal transduction pathways, resulting in the observed changes in cardiac function.
Adrenergic receptors (adrenoceptors) are receptors that bind adrenergic agonists consisting of the sympathetic neurotransmitter NE and the circulating hormone epinephrine (EPI). The maximum essential adrenoceptor withinside the coronary heart is the β1-adrenoceptor. When activated via way of means of a β1-agonist consisting of NE or EPI, coronary heart charge is elevated conduction pace is elevated contractility is elevated, and the charge of myocyte rest is elevated.
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Aseries of images displayed in sequence to create the illusion of movement is called ______________ .
Animation is the answer.
Animation is a method of manipulating a character and displaying it as a video. In traditional animation, you would draw or draw an image by hand on a transparent celluloid sheet, take a picture, or display it on film. Today, most animations are created using computer-generated images.
Animation is the quick display of a series of images to create the illusion of movement. The most common way to present an animation is as a movie film or video program. Simply put, animation brings our imagination to life.
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NEED HELP I WILL FAIL
You are an anthropologist analyzing bone remains from the grave of an ancient female human. Within one of the bones, you find an unusually high concentration of collagen. What does this suggest about the ancient female? (2 points)
She broke a bone and then died before it was fully healed.
She broke a bone and then died a few hours later.
She broke a bone at a very young age, but it fully healed.
She broke a bone at a very young age, but it did not fully heal.
She broke a bone and then died before it was fully healed. Option A
What is collagen?The collagen is a substance that serves to strengthen the bones. However, if a person gets older, its production reduces thereby making the bones to weaken.
When a person breaks a bone, the body secretes a lot of collagen to help the bone to heal. Therefore, if there is a high concentration of collagen present, it indicates that she broke a bone and then died before it was fully healed. Option A
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A student wanted to look at germination of five different seeds in vermiculite (a soil additive). He planted the seeds in identical containers and left them together in full sunlight. He gave each seed the same amount of water and charted the germination of each seed type. What is the independent variable in this experiment
The independent variable is the seed type. This cannot be changed while the other variables can be changed such as water, soil additive, and light.
Independent variables:
The variable which is not affected by the change in other variables at the time of study is called the independent variable. It is the cause of study. The dependent variables are the effect and are observed. These are dependent on the change in the independent variables. For example, seed type is an independent variable whereas germination which is the combined effect of light, water, and soil additive that determines the process of germination.
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If everyone on the planet used the same amount of resources as an average American, what percent of the Earth would need to be used to support everyone
If everyone on the planet used the same amount of resources as an average American, four Earths would be needed to sustain them.
What are Resources?These are the materials available in the environment which add quality and value to our life.
The earth comprises of resources which is limited and is therefore the reason why four earth will be needed to sustain them if everyone used the same amount.
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In a particular plant, leaf color is controlled by gene D. Plants with at least one D allele have dark green leaves and plants with the homozygous recessive dd genotype have light green leaves. A Dd plant is crossed with another Dd plant. The predicted offspring are represented by numbers in the Punnett square. Which box(es) correspond(s) to plants with a heterozygous genotype
Boxes 2 and 3 will correspond to plants with a heterozygous genotype
An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
What is Heterozygous genotype ?The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote)
In our example, this genotype is written Bb. Finally, the genotype of an organism with two recessive alleles is called homozygous recessive.Heterozygotes can get genetic disease, but it depends on the type of disease.Learn more about Heterozygous genotype here:
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Mutation spectrum analysis of Duchenne/Becker muscular dystrophy in 68 families in Kuwait: The era of personalized medicine
Duchenne and Becker muscular dystrophies (DMD/BMD) are X-linked recessive neuromuscular disorders characterized by progressive irreversible muscle weakness and atrophy that affect both skeletal and cardiac muscles
What is Duchenne/Becker muscular dystrophy ?Both Duchenne and Becker muscular dystrophy are caused by mutations in a protein called dystrophin
In Duchenne muscular dystrophy, functioning dystrophin is completely absent in muscle, while in Becker muscular dystrophy, there is some dystrophin present, although not enough for completely normal muscle function.it usually affects boys in early childhood; people with the condition will usually only live into their 20s or 30s.Learn more about Duchenne/Becker muscular dystrophy here:
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If the grasshoppers within a specific ecosystem are unable to detect vibrations, how will it affect that ecosystem?
If the grasshoppers within a specific ecosystem are unable to detect vibrations, they will not be able to communicate among themselves and defend against predators. This may lead to the loss of grasshoppers from the ecosystem.
What is vibrational communication?Sound is carried in the form of vibrations.Insects have sensory organs which help them to detect these vibrations.They interpret these sounds to communicate with each other and navigate through the environment.Vibrational signaling is the most common form of communication in insects which detects any mechanical disturbances in the surrounding environment.Some insects are even able to sense the sound of predators, thus are able to avoid them.Like many insects, grasshoppers have a pair of tympanal organs. These organs vibrate when they catch sound waves in the air. The larvae of grasshoppers use small stiff hairs called setae to sense sound vibrations.The caterpillars react to vibrations by exhibiting defensive posture.Learn about how animals communicate here:
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the activity of an enzyme might be increased by all of the following except the presence of other enzymes.
Answer:
the presence of lead
Explanation:
I hope this help
The activity of an enzyme might be increased by all of the following except lead, which is in option D. Lead is a heavy metal that can act as an inhibitor of enzymatic activity, so option D is correct here.
Enzymes are biological catalysts, which means they are molecules that speed up chemical reactions in living organisms without being consumed or altered in the process. Almost all biochemical reactions in cells require enzymes to proceed at a rate that is sufficient for life. They play a crucial role in various metabolic pathways, allowing cells to carry out essential processes such as breaking down nutrients, building cellular structures, and regulating cellular functions. The enzyme-substrate interaction is highly specific, like a lock and key. Only substrates with a complementary shape to the enzyme's active site can bind to it.
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Complete question is below,
The activity of an enzyme might be increased by all of the following except ________?
A. increase in substrate concentration.
B. a vitamin.
C. 2-4 degree increase in temperature.
D. lead.
A toxicity of folate can disguise a deficiency of which nutrient, resulting in nerve damage?
Large dose of folate increase the symptom of vitamin B12 deficiency . the vitamin B12 deficiency can lead to permanent damage of the spinal cord nerves and brain.
It can cause severe birth defects which is called neural tube defects. this defects include spinal, pifida . folate deficiency can also increase your chance of placental abrupt ion is a condition in which placental separate from uterus.
High dose of folate typically be remedied by taking supplement of both folic acid and vitamin B12. vitamin B12 works closely with vitamin B9 also called folic and folate acid which is help to make red blood cells and iron work better in our body.
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Other things being equal, what is a potential disadvantage of an enzyme having a very high affinity for its substrate?.
An enzyme with a high affinity for its substrate will require more energy to generate an enzyme-transition state complex (the activation energy of the forward reaction) because the energy of the enzyme-substrate complex will be reduced.
What is the disadvantage of an enzyme having high affinity fir its substrate?Since the ES complex would be in a "energy trough," the activation energy for the transition state would be quite high.
Tight enzyme-substrate binding will lower the reaction's forward rate constant.A forward reaction's activation energy will increase when an enzyme's affinity for its substrate is high.Because the enzyme-substrate complex will be located in a deep energy well, it will be more stable.In contrast to the situation where the substrate-enzyme binding is weaker, a tight binding of the substrate to the enzyme will alter the amounts of free substrate and free enzyme. This little modification won't have much of an impact on the reaction kinetics because the substrate concentration is often higher than the enzyme concentration.
It is unlikely that tight binding would result in the active site being altered. Since the enzyme is significantly bigger than the substrate, it is unlikely that it will change shape.
The reaction's forward rate constant will decrease with tight enzyme-substrate binding. It is conceivable that a substrate that is securely bonded would not easily change its shape as it passes from the transition state to the products.
High enzyme substrate affinities will result in a decrease in the energy of the enzyme-substrate complex and an increase in the energy needed to generate the enzyme-transition state complex (the activation energy of the forward reaction).
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there are more protons than electrons in a negatively charged atom, true or false
whoever answers this, thank you so much!
Answer:
Electrons
Explanation:
Electrons are negatively charged, so if an atom is negatively charged, there will be more
Answer:
False
Explanation:
The answer is False.
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Sexual reproduction produces ______, while asexual reproduction produces ______.
Answer:
Sexual reproduction produces genetically different offspring from two parents while asexual reproduction produces genetically identical offspring from one parent.
Sexual reproduction will see to the offspring taking half of their genetics from the father (male), while the other half comes from the mother (female). The offspring would further inherit based on whether the traits are dominant or recessive. However, in asexual reproduction, there is only one parent, so all the traits are passed down.
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True or false: sensitivity differences during light and dark adaptation result, at least in part, from the difference in bleaching and regeneration rates of photopsin and rhodopsin.
True, photopsin and rhodopsin are the photoreceptor proteins found in the cones of the retina and are the basis of color vision.
What is the function of rhodopsin?The retina contains a chemical compound called rhodopsin. It is responsible for converting light into electrical impulses that the brain interprets as vision. Nerve fibers from the retina come together at the back of the eye and form the optic nerve, which carries electrical impulses to the brain.
What is the function of the retina?The function of the Retina is to capture light through the cornea, pupil and lens, and, through the optic nerve, convert it into neural signals and send them to the brain, which transforms it into visual recognition.
With this information, we can conclude that A very thin layer of light-sensitive tissue, located at the back of the eye, the retina is formed by millions of photoreceptor cells, which capture, record, decode light waves and, through the optic nerve, send them to the brain, where the vision.
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In class, your professor shows you the skulls of three mammals. In one, the eye would be fully enclosed by bone. In the second, there is a bony circle around where the eye goes, but it is open in the back. In the third, the place where the eye would be is not encircled by bone at all. This suggests to you that
This suggests to you that
The first one is an anthropoid primate; the fully enclosed orbit is probably beneficial in an organism that relies heavily on vision.
Anthropoids are a group of primates currently represented by New and Old World monkeys, great apes and humans. They differ from other groups of primates such as strepsirrhines (lemurs) by several dental and cranial features (postorbital closure, shorter muzzles, increased vision due to more frontal eye sockets, fused frontal bone). The common ancestor of living anthropoids - including monkeys, apes and humans - arose in Africa and that the group had already branched into many species at that time.
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