In a mycorrhizal association, the plant root cells donate ________ to the fungus, which reciprocates by giving the plant ________
a. minerals / sugars and nitrogen-rich compounds
b. sugars and nitrogen-rich compounds / minerals
c. minerals / water
d. water / fixed atmospheric nitrogen
b
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When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. an induced fit B. a great range of possible catalytic activities C. a greater supply of activation energy D. more permanent binding through intimate total contact E. more possible products of the reaction
Which of the following statements describes an
electron transfer chain? a. It generates energy from carbohydrates. b. Cells use it to dispose of excess electrons. c. It utilizes ATP to synthesize nutrients. d. It transfers energy, stepwise, from one compound to another. e. It requires activation by oxygen.
If a sheep and goat are mated, their offspring dies as an embryo. This is an example of _______ reproductive isolation.
A. prezygotic B. allopatric C. sympatric D. postzygotic E. outgroup
Which of the following would be transcribed into mRNA?
A. a promoter B. a ribozyme C. a noncoding gene D. a protein-coding gene