Why do aquatic plants frequently have broad, floating leaves?
a. The byproducts of photosynthesis, such as glucose, are naturally buoyant.
b. Beneath a certain depth, insufficient oxygen exists to support photosynthesis.
c. To maximize their opportunities for photosynthesis.
d. Broad floating leaves provide shelter for fish that protect them from herbivores.
c. To maximize their opportunities for photosynthesis.
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Which of the following is true of enzymes?
A) Enzyme function is increased if the 3-D structure or conformation of an enzyme is altered. B) Enzyme function is independent of physical and chemical environmental factors such as pH and temperature. C) Enzymes increase the rate of chemical reaction by lowering activation energy barriers. D) Enzymes increase the rate of chemical reaction by providing activation energy to the substrate.
Which sequence reflects the locations that a secretory protein will visit on its way from its production to its secretion outside the cell?
A) rough ER, secretory vesicle, Golgi complex, ER vesicle B) rough ER, Golgi complex, smooth ER, ER vesicle C) nucleus, Golgi complex, rough or smooth ER, secretory vesicle D) smooth ER, rough ER, Golgi complex, secretory vesicle E) rough ER, ER vesicle, Golgi complex, secretory vesicle
Where do the light-dependent reactions take place?
a. stroma b. intermembrane space c. thylakoid membrane d. thylakoid lumen
What is one difference between ubiquinones and cytochromes?
a. Ubiquinones can only be reduced; cytochromes can only be oxidized. b. Ubiquinones are not made of protein; cytochromes are. c. Ubiquinones cannot carry electrons; cytochromes can. d. Ubiquinones can only be oxidized; cytochromes can only be reduced.