Double-stranded viral DNA is incorporated into a host cell as a _____.
a) promoter
b) provirus
c) transposon
d) lac
e) homeoboxes
Ans: b) provirus
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When someone has cataracts, they may be able to have a surgical replacement of their cloudy lens with an artificial lens. The artificial lens implant will be clear, but it is also fixed in shape. Based on your knowledge of vision, would it usually be necessary to get a new prescription for their glasses following this surgery?
A. Yes, the artificial lens will be fixed, so it cannot give distance vision one moment and near vision the next. B. No, they would no longer need glasses after lens replacement surgery because a new lens would not need correction.
The spaces that separate adjacent Schwann cells are called
a. neuroglia. b. myelin sheaths. c. nodes. d. dendrites. e. synapses.
A substance is most likely to diffuse into a cell when
(1) it is a large organic food molecule such as protein or starch (2) it is enclosed in an organelle such as a vacuole (3) the concentration of the substance is greater outside the cell than inside (4) the pH of the substance is greater than the pH of the cell
Which statement below characterizes metabolic pathways?
A. They are random sequences of reactions. B. They are always biosynthetic. C. They are always degradative. D. They are enzyme-mediated sequences of reactions. E. They are always linear reactions.