Organic acids are widely used in the preservation of food. They promote spore germination and prevent bacterial and fungal growth.
a. true
b. false
Answer: b. false
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Ectomycorrhizae, associations in which the fungal hyphae surround but do not penetrate the cell walls of the plant roots, usually involve
A. ascomycetes. B. basidiomycetes. C. zygomycetes. D. ascomycetes and basidiomycetes. E. ascomycetes and zygomycetes.
In which of the following tissues would one expect to see a lot of tight junctions?
a. red blood cells b. kidney glomeruli c. epithelial tissue of the urinary bladder d. alveoli in the lungs
An action potential begins in a neuron's trigger zone, the part of the axon adjacent to the cell body. When a neuron is at rest, this region's gated channels for sodium and potassium are ____
a. closed b. both open c. both open but inactive d. open only at gated sodium channels e. open only at gated potassium channels
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.