The protein complexes where exocytosis occurs are called
a. exocysts.
b. exocytocysts.
c. secretosites
d. secretion sites
Ans: a. exocysts.
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The protein SOS is a guanine nucleotide exchange factor for Ras. SOS helps facilitate the exchange of GDP for GTP. What would be the effect of a mutation that inhibits the interaction between SOS and Ras?
A. GTP would remain bound to Ras, thereby keeping Ras constitutively active. B. GDP would remain bound to Ras, thereby preventing Ras activation. C. Ras would be more likely to hydrolyze GTP to GDP. D. There would be no effect.
Precipitation is generally greater
A) in the Southern Hemisphere than in the Northern Hemisphere. B) in coastal areas than in interior areas. C) at the equator than at 30° of latitude. D) on the leeward side of mountains than on the windward side.
Enzymes can catalyze a reaction only if
a. they encounter a molecule of ATP. b. their active site is sufficiently oxidized. c. they have both products in their active site at the same time. d. they encounter a substrate that fits their active site.
The fact that tracheophytes can survive on land is due to which of the following?
A. alternation of generations B. A dominant gametophyte stage C. Adaptation to damp habitats D. Water transport through vascular tissues E. Mechanisms other than photosynthesis for carbohydrate production