At the end of the citric acid cycle, most of the energy remaining from the original glucose is stored in
A) CO2.
B) pyruvate.
C) ATP.
D) NADH.
Answer: D
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Prions contain
A. DNA only. B. protein only. C. RNA only. D. DNA, RNA, and protein.
__________ fights infection by increasing the metabolic rate.
Fill in the blank(s) with the appropriate word(s).
What is the best description of double fertilization in angiosperms?
A. One pollen grain fertilizes the embryo sac; the other sperm fertilizes the pollen grain. B. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the seed coat. C. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the endosperm. D. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the ovary, which becomes the fruit. E. One sperm fertilizes the egg, which develops into the embryo; the other sperm produces the pollen tube.
To be a successful cell evolutionarily, the earliest cells had to:
A) consume oxygen. B) reproduce. C) have mitochondria. D) photosynthesize.