Which of the following statements is TRUE?
a. Ion channels are primarily composed of fatty acids.
b. Usually both sodium and potassium can move through the same ion channel.
c. Membranes are usually slightly positively charged on the inside.
d. The electrical gradient in most cells tends to push K+ out of the cell, through open channels.
e. Channel gating can be regulated by the membrane potential.
Answer: e. Channel gating can be regulated by the membrane potential.
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Which of the following energy-generating processes is the only one that occurs in all living organisms:
a) glycolysis. b) photophosphorylation. c) the Krebs cycle. d) electron transformer system. e) None of the above. There are no energy-generating processes that occur in all living organisms.
Genetic engineering is the manipulation of an organism's DNA to produce new traits. Which of the following is an example of genetic engineering?
A) gel electrophoresis B) DNA fingerprinting C) cloning D) recombinant DNA
A virologist wants to observe the three-dimensional surface features of virus particles she is studying. Which of the following microscopes would be most useful for her observations?
A. differential interference contrast B. atomic force C. scanning electron D. transmission electron E. atomic force or scanning electron
Developing a novel synthetic antimicrobial drug OFTEN begins with identifying an essential ________ in the target organisms and then making slight chemical modifications to the structure to ensure that it is ________ incorporated
a. biosynthetic precursor / competitively b. biosynthetic precursor / noncompetitively c. cofactor / competitively d. cofactor / noncompetitively