The most leaching of minerals occurs from the ____________________ horizon into the ____________________ horizon.
The recessive allele that causes sickle cell anemia is harmful to homozygous individuals. what maintains the presence of this allele in a population's gene pool?
The one responsible for maintain the presence of this allele in the population’s gene pool is the heterozygote advantage. It is because the advantage of having this for a sickle cell disease is that if a person has a strong heterozygote advantage and that he or she has a copy of the allele that cause the sickle cell disease, the person will likely be resistant to the disease because of the heterozygote advantage in which the heterozygote genotype has a higher relative fitness making it resistant to the disease.
In general, what is not affected by the ingestion of caffeine?
a. behavioral consequences of alcohol intoxication
b. the risk of cardiovascular disease
c. the time it takes to fall asleep
d. performance of boring or repetitive tasks
A virus that attacks a bacterium is called a _____. (concept 19.1)
which arrow on the illustration represent the largest reservoir of nitrogen on earth
The element silicon is hard and brittle crystalline solid with a blue-gray metallic luster. Silicon is used as a semiconductor. Based on these properties as well as the location in the periodic table, we would classify silicon as a A) metal B) nonmetal C) metalloid D) rare Earth element
Answer: C) metalloid
Explanation: Metals are the elements which can easily lose electrons and are hard, ductile and possess luster. They are good conductors of heat and electricity.
Non metals are the elements which can easily gain electrons and are soft, non ductile and do not possess luster. They are insulators of heat and electricity.
Metalloids are the elements which have intermediate properties between those of metals and non metals and are called as semiconductors.
Thus Silicon is a metalloid.
A patient is crying. the nurse can correctly conclude from this type of nonverbal communication that
The side chain of ________ has a pka in the physiological ph range and is therefore often involved in proton transfer during enzymatic catalysis.
Final answer:
Histidine, with a pKa of around 7, is the amino acid whose side chain is most often involved in proton transfer during enzymatic catalysis due to its ability to exist in both protonated and deprotonated forms at physiological pH.
Explanation:
The side chain of histidine has a pKa in the physiological pH range and is therefore often involved in proton transfer during enzymatic catalysis. The pKa of the protonated histidine residue is approximately 7, which allows histidine to exist in both protonated and deprotonated forms within physiological conditions. This unique property makes it an ideal candidate to act as proton donor-acceptor groups in the active sites of enzymes. Histidine is commonly found in such roles in biochemical reactions because enzymes rely on the specific protonation states of amino acid residues to properly function.
are sea slugs slowly becoming what they eat
When it came to explaining the origins of variation within species, darwin?
had no idea of the true causes.
in most cases the individuals who possess favorable traits are more likely to survive
In what way do nuclear reactors negatively affect ecosystems?
Answer:
The nuclear reactors are cooled down by using huge amount of water, this water when released in the atmosphere causes thermal pollution. the warm water when gets mixed in the lakes and rivers affects the aquatic life.The nuclear reactors does not releases carbon dioxide into the environment but the uranium that is used as a raw material has many negative consequences when it comes to mining.There can be misuse of the nuclear energy that can adversely affect the environment.How many different types of transport tissues do plants have?
A dihybrid cross is created from plants that are heterozygous for both round seeds and yellow seed color. What is the ratio of offspring that have round seeds and yellow seed color?
Answer:
1 : 1
Explanation:
According to the question, the parents are heterozygous (RrYy) and each would produce four types of gametes: RY, Ry, rY, ry.
Random mating between gametes of two parents gives phenotype ratio 9 round yellow: 3 round green : 3 wrinkled yellow : 1 wrinkled green.
Hence, ratio of round seeds ( 9 + 3 ) to yellow seeds color (9 + 3) is 12:12 = 1:1.
What structures do sponges possess that may prevent other animals from eating them?
The answer is spicules. These sharp-pointed structures are formed from calcium carbonate skeleton of the organisms. They can also be formed from silica. They can be big (megascleres), or microscopic (microscleres). Also dependent on the number of axis on the spicules, they are classified as monoaxon, triaxon or polyaxon.
*For animal anatomy* The diaphragm is ______ to the stomach. a) dorsal b) rostral c) ventral d) cranial
The correct anatomical term for the position of the diaphragm in relation to the stomach is dorsal, meaning it is nearer to the back or spine side of the body.
Explanation:In terms of animal anatomy, the correct positional term for the relationship between the diaphragm and the stomach would be dorsal. The diaphragm is dorsal to the stomach. This means that the diaphragm is toward the back, or spine side of the body when compared to the position of the stomach. Other options like rostral, ventral and cranial don't correctly describe this anatomical relationship. Rostral refers to the towards the head end, ventral indicates towards the belly side and cranial refers to towards the skull or head.
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A sheet-like body that cuts across rock layers and produced when magma is injected into fractures is called a _____
The right answer is di-ke (dy-ke).
A di-ke (or dy-ke) is a magmatic rock slide that has infiltrated a crack through different layers of rock.
The thickness of a dy-ke can vary from a few centimeters to a few tens of meters but its length can reach several kilometers.
With erosion, a dy-ke can be isolated from surrounding rocks and form a wall.
Which layer of the eye completely surrounds the eye except for a dark, round opening called the pupil?
A)sclera
B)cornea
C)retina
D)choroid
Answer:
A)sclera
Explanation:
what are the steps for creating hydroelectric power?
river water enters a dam through channels. the channels are connected to a transformer, which turns a generator, producing electricity. the water is then transported through turbines to wastewater canals.
river water stored in a reservoir flows down a channel in a dam, turning a turbine as it passes. the turbine is connected to a generator that produces electricity, and then the water continues downstream
river water stored in a reservoir flows through a turbine and into a channel in a dam. at the end of the channel, the water turns a generator, which produces electricity; then the water flows back upstream.
river water enters a dam through a generator. the movement of the water through a generator produces electricity. then the water flows out the dam through turbines into a reservoir.
Explanation:
Hydro-power plant captures the energy of falling water to produce electricity.
Hydroelectric power is produced as follows:
Water from the reservoir are channelized into tunnel where they turn the turbine or rotates the turbine with high power.Turbine is further connected to the generator. The rotating of turbines enables the production of current via generator.The produced current or electric power is then sent to the transformer which further distributes the power into various electrical lines according to demand.Hence the correct answer is option:'river water stored in a reservoir flows down a channel in a dam, turning a turbine as it passes. the turbine is connected to a generator that produces electricity, and then the water continues downstream'.
Your practice partner just ordered an exercise echocardiography 2de for a patient with suspected cardiovascular risk. this patient has known resting wall motion abnormalities. why would this not be the best test to assess this patient's cardiac risk?
The table below shows the salmon population, in thousands of pounds, in Columbia River, from 1870 to 1950.
Year Salmon population (in thousands of pounds)
1870 10,200
1890 20,000
1915 20,500
1931 30,000
1950 10,000
Based on the table, which of these is most likely the period during which a series of large hydropower units were built on the Columbia River?
A. between 1870 and 1890
B. between 1890 and 1915
C. between 1915 and 1931
D. between 1931 and 1950
Answer:
Option D, between 1931 and 1950
Explanation:
The hydraulic structure of dam has some sub structures which interferes with the natural navigation of the fishes within any water body.
Due to such interference the fishes get diverted to a different path of flow and hence are not accountable. This causes reduction in the number of fish counts.
The higher the construction of dams, the higher will be the effect of it on the fish navigation which will ultimately lead to reduction in fish count.
Hence, option D is correct.
Hormones are secreted by exocrine glands directly into a body cavity or onto a body surface, rather than being transported by the blood. true or false?
Exocrine glands produce chemicals into ducts, which then deliver them to target tissues' surfaces. Therefore, the statement is true.
What are exocrine glands?A gland that secretes fluids, such as sweat, tears, saliva, milk, and digestive juices, through a duct or aperture that leads to the surface of the body. Sweat glands, lacrimal glands, salivary glands, mammary glands, and digestive glands in the stomach, pancreas, and intestines are all examples of exocrine glands. Exocrine glands are found throughout the body.
Both the liver and the pancreas are examples of exocrine and endocrine glands. Exocrine glands discharge compounds into the gastrointestinal system via ducts, such as bile and pancreatic juice. Endocrine glands, on the other hand, secrete substances directly into the bloodstream.
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Which statement describes the steps for chemical cycling in an old-growth forest? A) Trees create soil erosion, decay occurs, and trees take up soil nutrients.
B) Trees shade the ground, decay is slow, and trees take up soil nutrients.
C) Trees lose leaves, nutrients run off the soil, and soil erodes.
D) Trees create soil erosion, nutrients evaporate, and trees give off oxygen.
E) Trees take up soil nutrients, decay is slow, and trees give off oxygen.
Answer:
B) Trees shade the ground, decay is slow, and trees take up soil nutrients.
Explanation:
If you have ever been through a forest or a forest, you may have noticed that the soil in these environments is covered with organic matter. Leaves, branches, trees and even animals that end their natural life cycle end up disposing there, becoming great sources of nutrients after decomposition. Remember that in nature nothing is lost!
This process is known as “nutrient cycling,” which in other words means a continuous exchange of life-essential substances that takes place from soil to plants, and vice versa. In a dynamic interdependence, trees and plants return to the soil what has been "consumed" for their development, through the fall of leaves, fruits, and other things that will decompose, and thereafter, through the flow of energy, end up. getting back that extra little help.
This process occurs in the following steps: Trees shade the ground with falling leaves and fruits, decay is slow, and trees absorb soil nutrients from the decay.
Knowledge used in diagnosing, preventing, treating, controlling, or curing diseases of plants and animals is mainly generated through
Answer:
Biological research.
Explanation:
Biological research, besides being a way to build knowledge and information, is the basis for human progress in the scientific, technological and even cultural world. All the knowledge used in the diagnosis, prevention, treatment, control or cure of plant and animal diseases that we know today has been generated mainly through biological research.
Doing scientific research means defending an idea by basing it on bibliographies and data extracted from the real world and / or pages that are world mirrors. It is also to make queries through questionnaires, deductions, implications, proofs, related people at the same time to show through graphs the analyzes and interpretations of the results obtained with the research. It is seeking new information from existing ones and crossing knowledge. It is looking at the world and perceiving the "new".
As humans have converted prairies to pastures and farms, prairie dogs have lost 98 percent of their habitat. Prairie dogs are the only food source for ferrets. What is likely to happen to ferrets if prairies continue to dwindle?
A. Ferrets are likely to become overpopulated.
B. Ferrets are likely to become extinct.
C. Ferrets are likely to become plant eaters.
D. Ferrets are likely to become farm animals.
The correct answer is option B, that is, ferrets are likely to become extinct.
Ferrets are dependent completely on the prairie dogs for food and the construction of their homes. Thus, with the spontaneous loss of prairie dogs, the population of ferrets will also get a reduction. The black-foot ferret refers to a nocturnal stalker whose destiny is somewhat associated with that of the prairie dog. The ferrets feed on insects, mice, birds, ground squirrels, and it lives in the burrows built by prairie dogs, which are also its main prey.
However because of the generation of pastures and farms, and massive hunting, and poisonous campaigns against the prairie dogs, which are the prime food source for ferrets are also making the ferret population to decline.
A patient has been admitted to the hospital with exacerbation of heart failure (hf) that has resulted in pulmonary and peripheral edema. the nurse has been carefully monitoring the trajectory of the patient's signs and symptoms of hf. how can the nurse best monitor the patient's fluid balance?
What would occur if you forgot to add dntps to your pcr sample?
Which biological molecule contains a large amount of the element nitrogen?
Answer:
the correct answer would be proteins !
Explanation:
Where is the start codon located? where is the start codon located? in the dna just upstream of where transcription starts at the upstream end of the 3' untranslated region (utr) at the downstream end of the 5' untranslated region (utr) at the very start (5' end) of the mrna?
A cell has damaged DNA. Which checkpoint is responsible for checking this? M checkpoint
A cell has damaged DNA. The G2 checkpoint is responsible for checking this abnormality during the cell cycle.
How many checkpoints are there in a cell cycle?There are three major checkpoints that can be seen in the cell cycle. They are G1/S checkpoints, G2/M checkpoints, and the spindle assembly checkpoints (SAC).
The G2 checkpoint is responsible for checking the accurate replication of all chromosomes that have already been replicated. It also ensures that the replicated DNA is not damaged before the cell enters mitosis.
The G1 checkpoint prevents cells from replicating damaged forms of DNA and forces the cell to remain in the resting state.
Cell cycle checkpoints significantly regulate and control the overall mechanism of the cell cycle in eukaryotic organisms. They also ensure the accurate and valid progression of the cell cycle in each step of it.
Therefore, a cell has damaged DNA. The G2 checkpoint is responsible for checking this abnormality during the cell cycle.
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Explain why it is necessary to incorporate buffers into media in whcih micororagnisms are grown
Final answer:
Buffers are necessary in media for growing microorganisms because they help maintain a stable pH. By incorporating buffers into the media, researchers can create an environment that supports the growth of microorganisms by providing optimal pH conditions for their survival and reproduction.
Explanation:
Buffers are necessary in media for growing microorganisms because they help maintain a stable pH. Microorganisms have specific pH requirements for growth, and fluctuations in pH can hinder their growth or even kill them. Buffers act as chemical stabilizers, minimizing changes in pH by absorbing excess hydrogen ions (H+) or hydroxide ions (OH-).
For example, in bacterial culture media, buffers like phosphate buffer or Tris buffer are added to maintain the pH within the optimal range for bacterial growth, typically around neutral pH.
By incorporating buffers into the media, researchers can create an environment that supports the growth of microorganisms by providing optimal pH conditions for their survival and reproduction.