RNA nucleotides are linked by the enzyme _____________.
Fill in the blank(s) with the appropriate word(s).
Ans: RNA polymerase
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Restriction enzymes are
A. proteases. B. lipases. C. endonucleases. D. exonucleases.
Influenza strains that sweep around the world often carry names such as H5N1 or H2N2. If they are both flu viruses, why do they differ in their H and N numbers?
A. The H and N numbers indicate the type of glycoprotein spikes found in the viral envelope. B. The H and N numbers indicate the order in which the virus was discovered. C. The H and N numbers indicate the toxicity of the virus to humans and nonhumans. D. The H and N numbers indicate the geographical region in which the virus was discovered.
What stimulates secretion of testosterone by Leydig cells?
A. FSH B. Testosterone C. Estradiol D. LH E. Progesterone
)
A. Viable attenuated microbes can still multiply, inducing robust immune responses. B. They enhance herd immunity because they produce long lasting protection due to the memory response. C. They require special storage facilities. D. They can revert to a more virulent form due to mutation. E. They can be spread to non-immune individuals.