Color changes in leaves Leaves of many plants change colors in the fall because
a) the cooler weather causes plants to produce more of the accessory photosynthetic pigments.
b) chlorophyll in the leaves degrades with shorter days and cooler temperatures.
c) the decrease in daylight hours causes the plant to produce more of the accessory photosynthetic pigments.
d) plants produce more chlorophyll.
e) All answers are correct.
Answer: b) chlorophyll in the leaves degrades with shorter days and cooler temperatures.
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Retinal in prokaryotes is part of
A) photosynthesis. B) phototaxis. C) light-driven ATP synthesis. D) light-driven ATP synthesis and phototaxis.
Which of the following is not a type of natural selection?
A. disruptive selection B. directional selection C. artificial selection D. All of the answer choices are correct. E. stabilizing selection
The associated figure provides support for which of the following processes?
a. secondary succession
b. competitive exclusion
c. coevolution
d. mutualism
e. resource partitioning
How are Cryptosporidium sporozoites able to evade the immune system?
A) They attach to host cells and build a protective membrane from modified host cell membrane materials. B) Special proteins bind and inhibit antibodies from adhering to them. C) They escape from phagocytes. D) They reside inside the host cells. E) They evade phagocytosis by using a capsule.