The loss of wild relatives to crops also threatens breeders' abilities to create new varieties.
a. true
b. false
Ans: a. true
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Which of the following is not true about energy stored and released in cells?
A. The free energy stored in the phosphodiester bonds of ATP can be used to drive biosynthetic reactions of metabolism. B. ATP can be hydrolyzed to ADP and Pi and the energy released used to form chemical bonds. C. The hydrolysis of ATP results in a large negative change in the free energy. D. ATP can be hydrolyzed to AMP and PPi but the energy released is not used to form chemical bonds. E. All of these statements are true.
Which of the following involves a subjective judgment?
a. A fact b. A theory c. An hypothesis d. An opinion e. A control
What happens when Ras proteins become stuck in their “on” state?
a. Cellar responses are slowed. b. Additional ions are catalyzed. c. There is unregulated cell division. d. There is an increase in protein synthesis. e. Ligand-gated channels close off the membrane.
Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?
A) Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. B) Bright sunlight destroys photosynthetic pigments. C) Oxygen given off during photosynthesis interferes with the absorption of light. D) Other pigments absorb light in addition to chlorophyll a. E) Aerobic bacteria take up oxygen, which changes the measurement of the rate of photosynthesis.