How are facilitated diffusion and active transport different from each other?
a. Active transport requires a transport protein, while facilitated diffusion does not.
b. Facilitated diffusion requires a transport protein, while active transport does not.
c. Facilitated diffusion occurs against the gradient, while active transport does not.
d. Active transport occurs against the gradient, while facilitated diffusion does not.
Answer: d. Active transport occurs against the gradient, while facilitated diffusion does not.
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Referring to the illustration as a guide, if you were to put a stalk of celery into a mixture of water and food coloring, in which tissue would you expect to see the food coloring show later?
a. phloem
b. both xylem and phloem
c. xylem
d. none of these
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Organisms that evolved the ability to use H2O as a donor of electrons and hydrogen for the photosynthesis conversion of CO2 to organic compounds radically changed Earth by producing
a. sugar. b. cellulose. c. O2. d. H2.