All of the following are examples of voluntary muscle movement except
A. heart beating
B. leg kicking a soccer ball
C. arm picking up a glass
Which mechanism(s) are responsible for introducing new alleles into a population's gene pool?
A) gene flow
B) emigration
C) niche shift
D) natural selection
Answer: The right answer is -
A) Gene flow
Explanation:
Gene flow is a process of gene migration or the transfer of gene variant (also called allele, which is responsible for genetic variation in population) from one population to another population.
As a consequence of gene migration, new alleles are introduced or added in the already existing population, thereby increasing genetic diversity.
Thus, option A) is the right answer.
A bicameral legislature describes a legislative body made of _____.
The potential energy in atp is released when the terminal high-energy bond is broken by a process called
Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes ________. provide the melanocyte with nutrients necessary for melanin synthesis accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer maintain the appropriate ph in order for the melanocyte to synthesize melanin granules maintain the appropriate temperature so the product of the melanocyte will not denature
Keratinocytes help protect the skin from UV damage by accumulating melanin granules, which forms a UV-blocking layer. The balance of melanin production is vital for protecting the skin's DNA while also maintaining proper levels of nutrients like folic acid and vitamin D.
Explanation:Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer. Melanocytes are responsible for producing melanin, the pigment that gives color to the skin and helps protect it from UV radiation. Keratinocytes, the predominant cells in the epidermis, receive melanin from melanocytes and then move it to their superficial (upper) layers. There, the accumulated melanin forms a protective layer that absorbs and scatters UV radiation, preventing it from reaching deeper layers of the skin. This process is a crucial mechanism in the skin's defense against the harmful effects of UV radiation, including sunburn and the risk of skin cancer.
what is the relationship between ionic bonds and cleavage
Why is the cost of reproduction different for males and females?
The earliest ancestors of about half of all extant animal phyla can be traced back to the _____ explosion. see concept 32.2 (page 675)
If there is a blockage between the av node and the av bundle, how will this affect the appearance of the electrocardiogram?
Out of the following given choices;
A. PR interval would be smaller
B. QRS interval would be shorter
C. There would be more P waves than QRS complexes
D. There would be more QRS complexes than P waves
E. The T wave would be absent
The answer is C. Waves on the ECG represent the depolarization an repolarization of the atrial and ventricular walls. The sequence of waves on the ECG is P waves, QRS complex, then T waves. Therefore, If there is a blockage between the av node and the av bundle, P waves of atrial contraction are of longer intervals (more than 200 ms)compared to those of QRS complex of ventricular contraction. This is referred to as the First Degree Heart Block. In second-degree heart block, no QRS complex follows the P waves
Placer deposits form when _____.
heavy eroded particles settle out of moving water
hot, metal-rich fluids cool below the surface
magma cools in underground chambers
organic matter is compressed over millions of years
Answer: heavy eroded particles settle out of moving water
Placer deposits forms when rocks weathered due to the effect of water. The heavy minerals from the rocks get settled down in water. Minerals that form placer deposits have high specific gravity, they are resistant to chemical weathering process and are durable.
Placer deposits form when (D) organic matter is compressed over millions of years.
Further Explanation:
During the sedimentaryprocess when the heavy and valuable minerals accumulate, placer deposits/ placer is formed. These are found in the mountain streams. Placer deposits are usually associated with precious metal mining like gold. Sedimentation is the process of settling down of the particles in a medium according to their size.
In the presence of gravity sedimentation occurs. The larger particles have more gravitational force that pulls them down followed by the lighter ones. When the heavy and stable minerals are introduced to weathering, the particles get eroded and flow down through a stream. Because of the heaviness, the metals then settle down at some place and this phenomenon results in the formation of placer deposits.
Placer deposits are usually used in economic geology because metals of high specific gravity which settle down and are concentrated over time are used for valuable purposes.The few varieties of the so-called placer deposits would include: stream or alluvial placer deposits; beach placer deposits; eluvial placers; and eolian placer deposits. Stream or alluvial deposits are so far the most significant placer deposits because these have yielded the most placer gold, cassiterite, platinum, and gemstones. Placer deposits can demonstrate to be truly significant because of a similar reason of high measures of important metals found there.
Learn more:
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AnswerDetails:
Grade:Middle School
Subject:Biology
Chapter:Types of Soils
Keywords:
Sedimentary process, heavy metals, sedimentation, minerals, minerals accumulation, gravity, gravitational pull, placer deposits, economic geology, high specific gravity.
Why are plants classified as producers? why are plants classified as producers? plants are classified as producers because they are at the bottom of the food chain. plants are classified as producers because they produce oxygen. plants are classified as producers because they fix inorganic carbon into organic molecules?
Plants are classified as producers because they are autotrophs that can generate their own food through photosynthesis. They form the base level of the food chain, providing energy and nutrients for all other organisms in the ecosystem. Without them, the survival of other life forms on earth would be impossible.
Explanation:Plants are classified as producers in the ecosystem because they can generate their own food using inorganic carbon as a carbon source through a process known as photosynthesis. During photosynthesis, plants harness solar energy and convert it into chemical energy, in turn creating complex organic molecules such as glucose. This ability to produce their own food classifies plants as autotrophs, which include photosynthetic organisms like algae and certain types of bacteria.
In the context of the food chain, plants are often situated at the base or foundation, making them primary producers. The organisms that consume these primary producers are herbivores, known as the primary consumers. This cycle continues up the food chain with secondary, tertiary consumers, all the way to apex consumers, with each level feeding on the one below it. Therefore, without plants and their photosynthesis process, energy would not be readily available to other living organisms in the ecosystem, making life as we know it impossible.
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Which group of organisms survived mass extinctions that marked the end of both the Paleozoic era and Mesozoic era?
An anaerobic organism does not need ________ to survive.
Answer:
The answer is Oxygen
For ingested foods, the first opportunity for enzymatic digestion occurs in the _____. see concept 41.3 (page 903)
Answer;
The mouth
For ingested foods, the first opportunity for enzymatic digestion occurs in the mouth.
Explanation;
The digestion of food starts in the mouth.
There is both mechanical and enzymatic digestion of food in the mouth. Mechanical digestion involves the mechanical break down of food using teeth to smaller particles thus increasing the surface are for the activity by enzymes.
Enzymatic digestion in the mouth involves enzyme salivary amylase which acts on starch to form maltose.
For ABP, is BK a median an altitude or neither
Witch contribution did Kepler make to viewing the solar system? A: He proposed the earth-centered model of the solar system. B: He proposed that gravity kept the planets in their orbit. C: He showed that planets moved in elliptical orbits. D: He proposed the sun-centered model of the solar system.
Answer:
C: He showed that planets moved in elliptical orbits.
Explanation:
Copernicus described the solar system model with Sun at its center and planets along with their moons revolving about the Sun in circular orbits. This model is known as heliocentric model and this shift from geocentric model is known as Copernican revolution. Kepler supported the heliocentric model but showed that the planets revolved in elliptical orbits with the Sun at one of its foci. He wrote laws describing the planetary motion.
Answer:
Hello friend the answer is C.
Explanation:
I do K12 so this would help you a lot for the ones who are in K12. :)
It is possible for a cell to make proteins that last for months; hemoglobin in red blood cells is a good example. however, many proteins are not this long-lasting; they may be degraded in days, hours, or even minutes. what is the advantage of short-lived proteins? (concept 18.2)
This enables homeostatic regulation. It allows the cells to regulate, in real time, the amount of a particular protein at a particular time period. Different proteins are useful in different biological pathways and their amounts in the body are significant in determining the progress of these pathways.An example of such protein is insulin responsible for regulating blood sugar levels
From the end of the small intestine, the segments of the large intestine, in order, are:
Final answer:
The large intestine begins with the cecum followed by the ascending, transverse, descending, and sigmoid colons, rectum, and ends at the anus, responsible for absorbing water, forming feces, and defecation.
Explanation:
From the end of the small intestine, specifically the ileum, the segments of the large intestine, in order, are as follows: the cecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, and anus. The ileocecal valve, located between the ileum and the large intestine, regulates the movement of chyme into the large intestine. Once in the large intestine, the digestion process continues with the absorption of water and nutrients, the breaking down of carbohydrate residues by bacterial flora, and the synthesis of certain vitamins. The goblet cells within the mucosa of the large intestine secrete mucus, easing the passage of feces.
The large intestine's function is to absorb water and form feces in preparation for defecation, and its various sections each play a role in this process. The cecum is the first part where chyme enters, followed by the ascending, transverse, and descending colons, the sigmoid colon, and ultimately the rectum. The rectum serves as storage for feces before elimination occurs, ending with the anus, where feces are expelled.
Learning that is not directly observable is called ________.
Answer:
This is known as latent learning: learning that occurs but is not observable in behavior until there is a reason to demonstrate it. Latent learning also occurs in humans.
Explanation:
The right answer is D. Latent Learning. This type of learning is not visible or expressed by the person until a reinforcement occurs that drives the person to do what they have learned. For example, a young man makes a sandcastle when they go to the beach, when they ask him how he learned to remember that it was through a television program he saw years ago.
What is the difference between directional, stabilizing, and disruptive selection? 25 points!!
Explain how electrophoresis can be used as a part of genetic testing.
What happens during meiosis that would allow genes located on the same chromosomes to separate independently of one another?
Which statement best describes why carbon is the key element in organic compounds?
Carbon is extremely reactive and must form bonds for stability.
Carbon is the most abundant element in the universe.
Carbon is the least reactive element on the periodic table.
Carbon has a strong tendency to form chains or rings.,
Alcoholic beverages
a.dilate the blood vessels and
b.increase the amount of water removed from the blood. how would factors a and b affect blood pressure?
List the structures that make up the pathway of air through the respiratory startin with the external nares
Sensory cells and sensory neurons allow multicellular animals to sense physical and chemical cues from their environment. what key properties of these cells enable them to perform this function? (select all that apply.) sensory cells and sensory neurons have electrically excitable membranes that change in charge potential in response to binding an environmental signaling molecule. sensory neurons have myelinated dendrites that serve as nerve endings. all sensory cells and sensory neurons fire action potentials when they bind a signaling molecule. sensory cells and sensory neurons have protein receptors linked to intracellular or membrane-based signaling pathways that alter ion channel permeability.
Answer:
A. Sensory cells and sensory neurons have electrically excitable membranes that change in charge potential in response to binding an environmental signaling molecule
B. Sensory cells and sensory neurons have protein receptors linked to intracellular or membrane-based signaling pathways that alter ion channel permeability.
Explanation:
Neurons have ability to change the charge potential across their membrane in response to certain stimulus or binding of signaling molecule. To allow the binding of signaling molecules, these neurons have receptors on their surface. The binding of signaling molecules affects the charge potential by affecting the permeability of ion channels. Hence, presence of receptors and ability of changing the ion concentration and thereby charge across their membrane allow the sensory cell and neuron to sense the stimulus.
The 15-month-old you are treating is in respiratory arrest. pulse still present at 108, skin is cyanotic. mom states the baby was fine a minute ago and when she came back, her daughter wasn't breathing. you open the airway and make an attempt to ventilate but no air goes in. you reposition the child with padding under her shoulders and reattempt ventilations, but still no air entry is achieved. what is your course of action now?
A client with diabetes insipidus has been administered desmopressin and is now reporting drowsiness, light-headedness, and headache. what intervention will best address this client's symptoms?
a. temporary bed rest
b. stat administration of epinephrine
c. administration of a loop diuretic
d. reduction in the client's dose of desmopressin
Which specific term describes teeth with two ridges, as found in old world-monkey molars?
Some people have the ability to taste a bitter chemical called phenylthiocarbamide (PTC). The ability to taste PTC is due to the presence of at least one dominant allele for the PTC taste gene. The incidence of nontasters in North America is approximately 45%. Assuming the population is in Hardy-Weinberg equilibrium, what percent of the North American population is homozygous dominant for the ability to taste PTC? Provide your answer as a number between 0 and 1 to the nearest hundredth.
The ability to taste PTC is thanks to the presence of a minimum of one dominant allele for the PTC taste gene, so a nontaster genotype should be pure recessive(pp). If the frequency of pp is 45%, then the frequency of p would be:
pp=0.45
p= √0.45
p=67%
p+P= 100%
P= 100%- p
P= 100%-67%= 33%
The number of North American population that has is pure dominant(PP) genotype would be:
P=33%
PP= 33%^2= 10.89% = 0.1089 = 0.11
Why can some people taste the bitter chemical PTC?Some people have the ability to taste a bitter chemical called phenylthiocarbamide (PTC).
The shape of the receptor protein determines how strongly it can bind to PTC. Since all people have two copies of every gene, combinations of the bitter taste gene variants determine whether someone finds PTC intensely bitter, somewhat bitter, or without taste at all.
Thus, the ability to taste a bitter chemical called phenylthiocarbamide.
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