NADPH is produced by
A. light reactions alone.
B. neither the light reactions nor the Calvin cycle.
C. the Calvin cycle alone.
D. both light reactions and the Calvin cycle.
E. NADPH production is not a part of photosynthesis.
A. light reactions alone.
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It is thought that eukaryotes probably originated about _____ years ago.
A. 2 billion B. 6 million C. 1 billion D. 4 million E. 3 billion
Which of the following statements is false? a. Blood circulates faster through a fish than through a human. b. Fish have only a two-chambered heart, but humans have a four-chambered heart fully partitioned into two halves. c. Humans
have pulmonary capillaries for uptake
of oxygen, whereas fish have gill capillaries for
this purpose.
d. Blood pressure is lower in the capillary beds
than in the arteries serving them.
e. The circulation of blood in humans is more
efficient than in fish.
How does the availability of milkweed plants affect the migration of monarch butterflies?
a. Without milkweed plants, the female monarch would starve. b. Without milkweed plants, the monarch larvae would starve. c. Without milkweed plants, the male monarch would starve. d. When milkweed plants are abundant, monarch predators would thrive e. When milkweed plants are abundant, the male monarch could not find a mate.
Parental care of offspring:a
for many animals has a lower cost than benefit. b. results in a decreased probability that each offspring will survive. c. is more common in species in which the female produces two or more times during a breeding season. d. is more common among male animals than among females. e. is more common among male fishes than among females.