In invertebrates, such as flatworms, groups of neurons called ____ perform common functions
a. nerve cords
b. ganglia
c. brains
d. nerve nets
e. radially symmetrical
ANSWER: b
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A cellular response to a signal can be terminated by:
A. depletion of the signal that activates the receptor. B. inactivation of intracellular signaltransduction proteins. C. automatic inactivation of proteins in the signal pathway over time. D. depletion of a second messenger. E. All of these choices are correct.
When characterizing DNA gyrase, the Cozzarelli group added a minimal amount of ATP to the reaction tubes containing DNA and gyrase. They did this in order to:
A. confirm that ATP would cause the reaction to reverse and the relaxed DNA would revert to supercoiled form. B. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 1 C. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 2 D. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 1 E. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 2
Which subatomic particle gets calculated in a mass number?
a. protons b. neutrons c. protons and neutrons d. protons and electrons
After fertilization in flowering plants, an embryo in a seed
a. begins as a gametophyte and ends up as a sporophyte before germination. b. is always a sporophyte. c. is usually a gametophyte but can be a sporophyte. d. begins as a sporophyte and ends up as a gametophyte before germination. e. is always a gametophyte.