The bacterium Vibrio cholerae releases a toxin that blocks a channel protein in the membranes of cells that line the intestine. This toxin prevents the movement of sodium ions from the inside of the intestine into cells
If the sodium ions could not move into the cells, how would this affect the movement of water between the inside of the intestine and the cells?
A) Water would leave the cells and enter the intestines by facilitated diffusion.
B) Water would leave the intestines and enter the cells by osmosis.
C) Water would leave the cells and enter the intestines by osmosis.
D) The movement of water would not be affected.
E) Water would leave the intestines and enter the cells by facilitated diffusion.
C
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Ethylene has the effect of causing fruits to:
A. enlarge B. ripen C. shrink D. elongate E. increase in juice content
The carbon cycle revolves around
A. nitrogen. B. water. C. phosphorus. D. carbon dioxide.
Which biome occurs in the interiors of continents where winters are cold and snowy and summers are warm and fairly
dry?
a. tropical montane forests b. temperate grasslands c. chaparral d. dry savannas e. temperate forests
The role of arroworms in the pelagic ecosystem is to:
a. filter feed on small plankton. b. link primary and higher consumers in the food chain. c. prevent grazers from population explosions. d. scavenge nutrition from dying animals. e. recycle nutrients from detritus.