Stomata open and close in response to water pressure within
A. root cells
B. cell walls
C. guard cells
D. xylem
Ans: C. guard cells
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
All of the following are distinctions between alpine tundra and arctic tundra except:a
Alpine tundra is located at high altitudes. b. Alpine tundra typically lacks permafrost. c. High elevations of temperate mountains do not have the great extremes of day length that are associated with the changing seasons in high-latitude biomes. d. The intensity of solar radiation is greater at high elevations than at high latitudes. e. Alpine tundra receives less precipitation than arctic tundra
During the light-independent reactions of photosynthesis,
A. glyceraldehyde-3-phosphate is produced. B. ADP is produced. C. NADP+ is produced. D. All of the choices are correct.
The location of translation in prokaryotic cells is
A. on ribosomes. B. on the plasma membrane. C. on mesosomes. D. on chromosomes E. in the nucleoid.