The statement "DNA ? RNA ? Proteins" ________.
A) is known as the central dogma
B) depicts the regulation of gene expression
C) is the same in all organisms, as well as viruses and prions
D) describes a series of catalytic reactions
Answer: A) is known as the central dogma
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A toxin interferes with the opening of Na+ channels in the postsynaptic membrane so they open more slowly when
bound to a neurotransmitter. What effect would there be on action potential formation in the postsynaptic membrane?
What will be an ideal response?Superantigens
A. are potent stimulators of T cells. B. include erythrogenic toxin. C. include streptolysin O. D. induce production of tumor necrosis factor. E. All of the choices are correct.
How many chambers does the frog heart have?
a. one. b. two. c. three. d. four.
Which of the following statements concerning bacterial growth at low temperatures is not true?
A) Low temperatures slow growth of cells B) Low temperatures reduce the rate of chemical reactions C) Low temperatures decrease the rate at which nutrients cross the cell membrane D) Low temperatures destroy lipids that make up the cell membrane E) Low temperatures reduce the fluidity of the cell membrane