Which of the following serves as a switching mechanism in the photoperiodic response in plants?
a. phytochrome
b. auxin
c. cryptochrome
d. calmodulin
e. phytoalexin
A
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Which of the following statements is not true of the seed plants?
A. Gametes are dispersed via wind or animals. B. They produce pollen. C. The sporophyte is dominant. D. They all produce ovules, which develop into seeds. E. They all produce fruit, which aids in dispersal.
In noncompetitive feedback inhibition
a. the products of the reaction block the active site of the enzyme. b. the products of the reaction at the end of the pathway bind to a site other than the active site of an enzyme at or near the beginning of the pathway and block enzyme activity indirectly. c. the substrate and cofactors compete for the active site. d. the inhibitor binds to and directly blocks the active site of the enzyme. e. enzyme activity is controlled by the reversible binding of a regulatory molecule.
The correct sequence of increasing organizational complexity is
A. organ, tissue, cell, organ system, organism. B. organism, tissue, cell, organ system, organ. C. tissue, cell, organ system, organism, organ. D. cell, tissue, organ, organ system, organism. E. cell, organ, organ system, tissue, organism.
The process by which a single primary RNA transcript is used to make multiple proteins is called:
A. combinatorial control. B. alternative splicing. C. regulatory splicing. D. translational control. E. polymeration control.