The process of a high-energy "donor" molecule physically transferring a phosphate group to ADP is called
A. substrate-level phosphorylation.
B. glycolysis.
C. oxidative phosphorylation.
D. photosynthesis.
E. electron transport.
A. substrate-level phosphorylation.
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A virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow, thus producing two populations of squirrels. What must occur for the two populations of squirrels to be considered separate species?
A. The two squirrel populations must feed on different species of plants. B. The environment must change so that the populations exist in distinct habitats. C. The fur color or other morphological characteristic of the two squirrel populations must become distinct. D. The two squirrel populations must select mates using different behaviors. E. The two squirrel populations must be reproductively isolated. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about speciation? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In negative feedback, the variable being regulated is changed in the _______ direction, while in positive feedback the variable is changed in the ________ direction.
A. same, opposite B. decreasing, increasing C. negative, positive D. inhibitory, stimulatory E. opposite, same
Why do the centromeres of sister chromatids stay firmly connected during anaphase I?
a) The proteins of the centromere region are impervious to lipase digestion. b) The cohesin situated at the centromeres is digested by nucleolytic enzymes. c) The DNA of the centromeres is hydrolyzed by proteolytic enzymes. d) They are fused together at the level of their double helices. e) The cohesin situated at the centromeres is protected from proteolytic attack.
The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of ____.
A. natural selection B. genetic isolation C. the bottleneck effect D. the founder effect E. the wild card effect