Unlike most enveloped viruses, herpes viruses involve the host ________ membrane in the formation of their envelope.
A. nuclear
B. plasma
C. mitochondrial
D. None of the choices are correct.
Answer: A
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Hydrocarbons are hydrophobic because:a
the covalent bonds between hydrogen and carbon are nonpolar. b. they contain oxygen atoms. c. they exist as isomers. d. the covalent bonds between carbon atoms are polar. e. the hydrogen bonds between hydrogen and carbon are nonpolar.
You are having lunch with an elderly friend when suddenly he begins to experience chest pain and tightness. He reaches into his pocket, gets out one of his nitroglycerin tablets and quickly takes it. After the episode passes, your friend asks you how the nitroglycerin helps his angina. You explain that nitroglycerin gets converted by cells to nitric oxide (NO) causing the smooth muscle cells of the blood vessel to relax and increase blood flow to the heart. He pushes you for a more detailed explanation, so you explain further that:
A. NO activates a protein kinase which catalyzes the synthesis of cGMP, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation. B. NO activates guanylyl cyclase, which catalyzes the synthesis of cGMP, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation. C. NO inhibits guanylyl cyclase, which allows the build up of cGMP, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation. D. NO activates cGMP, which catalyzes the synthesis of guanylyl cyclase, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation.
Met" refers to a gene that governs a cell's ability to synthesize methionine from inorganic precursors. What does the designation "met-" indicate?
a. that the allele is normal (i.e., wild type) b. that the bacterium is biologically active c. that the bacterium is biologically inactive d. that the allele is the mutant allele
Allopatric speciation results from __________ isolation of a population.
Fill in the blank(s) with the appropriate word(s).