The plant hormone ____ stimulates stomata to close during a drought
a. salicylic acid
b. gibberellin
c. abscisic acid
d. auxin
e. oligosaccharin
ANSWER: c
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The MONOPTEROUS gene in Arabidopsis encodes a protein that is similar in its function to which animal protein?
A) MyoD in frog embryos B) Bicoid in fruit-fly embryos C) keratin in human embryos
True or False: some ions that facilitate enzymatically catalyzed reactions are capable of catalyzing reactions independently of an enzyme
A. true B. false
Which of the following does not occur in prokaryotic gene expression, but does occur in eukaryotic gene expression?
A) mRNA, tRNA, and rRNA are transcribed. B) RNA polymerase binds to the promoter. C) A cap is added to the end of the mRNA. D) RNA polymerase requires a primer to elongate the molecule.
Short-day plants flower only if
A) they are in the shade. B) abscisic acid is available. C) the duration of uninterrupted darkness is longer than some species-specific length. D) their phytochrome-mediated responses are inhibited.