What is the function of reverse transcriptase in retroviruses? it converts host cell rna into viral dna. it uses viral rna as a template for dna synthesis. it hydrolyzes the host cell's dna. it translates viral rna into proteins. it uses viral rna as a template for making complementary rna strands?

Oxygen-poor blood flows through the right atrium, right ventricle, and pulmonary arteries, and is directed towards the lungs for gas exchange. After receiving oxygen, it returns to the left atrium via the pulmonary veins.

Oxygen-poor blood flows through certain parts of the heart as part of the cardiovascular system's process of cycling blood to and from the lungs for gas exchange. Initially, the right atrium receives oxygen-poor blood from the body through two major veins: the superior vena cava, which returns blood from above the diaphragm, and the inferior vena cava, which returns blood from below the diaphragm. Then, the blood moves to the right ventricle, which pumps it toward the lungs via the pulmonary arteries, the only arteries that carry oxygen-poor blood.

With the help of pulmonary circulation, the oxygen-poor blood is directed to the lungs, where it releases carbon dioxide and picks up oxygen. After the exchange, the now oxygen-rich blood is carried back to the left atrium of the heart through the pulmonary veins, the only veins in the body that carry oxygen-rich blood. Systemic circulation then takes over, as the left ventricle pumps the oxygenated blood throughout the body to deliver oxygen to tissues.

A blockage in a coronary artery can prevent oxygen from reaching the heart muscle, highlighting the critical nature of unimpeded blood flow. It's important to understand the distinction between pulmonary and systemic circulation and how they contribute to the overall function of the cardiovascular system.

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Ionotropic effect

An ionotropic effect is a reaction that describes the effect of a neurotransmitter or hormone on a neural receptor. The presence of neurotransmitters or hormones activates or deactivates the ionotropic receptors in order to cause a depolarization or hyperpolarization which is positive or negative reactions.

Genotype for pea shape could be 'r', 'R', or 'RR'. 'RR' represents a homozygous dominant trait producing round peas. Round peas is a phenotype, not a genotype.

The genotype for pea shape in genetics can be represented using different combinations of alleles. In this case, the options A, B and C - 'r', 'R', and 'RR' - could all be genotypes for pea shape. 'RR' would typically represent a homozygous dominant trait, meaning round peas, whereas 'r' and 'R' are alleles that could combine in different ways to produce different physical traits, or phenotypes. So the correct answer is C: 'RR' is a genotype for pea shape. Option D - round peas - represents a phenotype or the physical expression of the genotype.

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Answer:

[tex]8.432 * 10^{23}[/tex] molecules

Explanation:

As per Avogadro's constant for atoms, one mole of an element/compound consists of [tex]6.023 * 10^{23}\\[/tex] atoms/molecules.

Thus, the number of molecules in “n” moles of an element and compound  is equal to the product of number of moles of the element and compound and  Avogadro's constant.

Thus, 1.4 moles of [tex]N_{2}[/tex] will have  

[tex]1.4 * 6.023 * 10^{23}[/tex] molecules

[tex]= 8.432 * 10^{23}[/tex] molecules

The hippocampus, a part of the human brain, is primarily involved in memory formation and spatial awareness, not the control of balance and body movements.

The hippocampus is an essential part of the human brain that plays a crucial role in memory processing and spatial awareness. It is not directly involved in controlling balance, movement coordination, or the bilateral symmetrical control of body movements. Instead, these functions are primarily managed by other parts of the brain such as the cerebellum. The hippocampus' primary role is in forming new memories and helping orient us in space. The ability to navigate through our environment and remember locations is largely due to the work of the hippocampus.

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Final answer:

Rosalind Franklin's X-ray diffraction data provided evidence that DNA has a helical structure with two strands, leading to the double helix model proposed by Watson and Crick. Her critical contributions were recognized posthumously as Nobel Prizes are not awarded posthumously.

Explanation:

The data collected by Rosalind Franklin through X-ray diffraction methods suggested several critical features about the structure of DNA. Most notably, Franklin's photographs indicated that DNA was composed of two strands, forming a helix. Her image known as "Photograph 51" revealed a clear X-shaped pattern pointing to the helical structure of DNA. Franklin also discovered that DNA consisted of two forms: a long, thin fiber when wet (type B) and a short, wide fiber when dry (type A). These observations provided Watson and Crick with the crucial information needed to model DNA as a double helix, determining the size and structure of DNA.

Franklin's contribution to the discovery of DNA's structure was fundamental, yet her work did not receive the same recognition as her male counterparts during her lifetime. Unfortunately, the importance of Franklin's research was fully acknowledged only after her untimely death, as Nobel Prizes are not awarded posthumously. Despite this, her work continues to be celebrated for its invaluable contribution to our understanding of genetics and molecular biology.

The vocabulary of children grows rapidly from the age of 2. By age 5, children generally understand about 6,000 words, and by age 6, their vocabulary has expanded to approximately 10,000 words.

The child's vocabulary growth starts already at age 2, with usage of between 50 and 200 words, and by age 3, that number increases to approximately 1,000 words. This early vocabulary is largely composed of familiar objects or events, often nouns. As kids grow, rapid vocabulary expansion happens, which is often called the "vocabulary spurt." During this stage, their vocabulary increases by about 10-20 new words each week. According to research, however, not every child experiences this rate of growth. By age 5, they typically understand about 6,000 words and can speak 2,000 words fluently. With this in consideration, by age 6, a child should ideally have a vocabulary of around 10,000 words.

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The 2% of the insects will begin to reproduce and grow their population exponentially and in time enable the population to recover. This is if the population is large enough to enable random mating. The 98% reduction in population drastically reduces competition for the remaining individuals hence giving them abundant resources for them to thrive.   

The bacterial proteins FtsZ, MreB, and cres regulate cell shape and structure and are homologous to the eukaryotic protein tubulin, indicating a common evolutionary origin.

The bacterial proteins FtsZ, MreB, and cres are homologous to the tubulin protein in eukaryotes. Deriving from common evolutionary origins, FtsZ is presumed to be the ancestor protein to both the modern FtsZ and tubulin. Both proteins can be found in existing organisms, though the function of tubulin has evolved and diversified significantly since its evolutionary origin from FtsZ. Similar to the way tubulin forms microtubules, centrioles, and various cytoskeletal components, FtsZ proteins can form filaments, rings, and other three-dimensional structures. Additionally, both FtsZ and tubulin use the same energy source, GTP (guanosine triphosphate), to rapidly assemble and disassemble complex structures.

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The answer would be B: Lipids.

Notochord

During gastrulation in frogs, a rod of mesoderm under the dorsal surface develops into the notochord which is the precursor of the backbone. The notochord plays an important structural role by serving as the axial skeleton of the embryo until other elements such as the vertebrae forms.

The answer is Electric.

Answer:

electric

Explanation:

on usa test prep A. ELECTRIC

The sediments in a riverbed likely result from the weathering and erosion of nearby rock, carried by natural forces like water flow and deposited through a process called deposition.

The sediments found in a riverbed are most likely a result of various actions on nearby rock, including weathering and erosion. These processes lead to the breakdown and transport of rock material. Weathering involves the physical and chemical breakdown of rocks into smaller fragments. Erosion encompasses the removal of these fragments from their original location through natural forces such as water flow in rivers. Eventually, these sediments are carried and deposited in different areas, including riverbeds, through a process known as deposition. Over time, the accumulation of these sediments can lead to the formation of sedimentary rock, given sufficient pressure from additional layers of sediments. Important factors in this process include hydraulic action, which lifts sediment from the sides and bed of the river channel, and abrasion, where materials suspended in the water help to scour the bed and sides of the channel.

The glomerular hydrostatic pressure, a force inherent to the blood pressure within the glomerular capillaries in the kidneys, is the main driver for the filtration of water and solutes across the filtration membrane. This process, known as glomerular filtration, is facilitated by the semi-leaky nature of the capillaries and occurs via passive diffusion. The blood pressure in the glomerulus is crucial for the Glomerular Filtration Rate (GFR), an indicator of kidney function.

The chief force pushing water and solutes out of the blood across the filtration membrane is glomerular hydrostatic pressure (glomerular blood pressure). This hydrostatic pressure, operating in the renal glomerulus, drives the filtration process in the kidneys by forcing water and solutes such as salts, glucose, urea and many other substances into the glomerular capsule, which starts the formation of urine. As fluid and solutes move from the high-pressure condition inside the blood vessel to the lower pressure area inside the glomerular capsule, the process of glomerular filtration occurs.

Glomerular filtration filters out most solutes due to high blood pressure and specialized membranes in the afferent arteriole. The blood pressure in the glomerulus is maintained independent of factors that affect systemic blood pressure. The semi-leaky nature of the capillary walls in the glomerulus allows solutes to pass through easily. Solutes, except for larger particles such as proteins, pass through by passive diffusion, a process that requires no energy.

Furthermore, the Glomerular Filtration Rate (GFR) is a measurement of how well your kidneys are filtering wastes from your blood and is regulated by glomerular hydrostatic pressure among multiple other mechanisms. An understanding and analysis of the GFR value are crucial for understanding kidney function and diagnosing potential issues.

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Answer:

B)

general

Explanation:

just did the test on usatestprep