When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. This does not happen to plant cells, because _____.
a. certain gated channel proteins embedded in their plasma membranes open as osmotic pressure decreases, allowing excess water to leave the cell
b. they have cell walls, which prevent the entry of water by osmosis
c. they have large central vacuoles, which provide abundant space for storage of incoming water
d. they have cell walls, which provide pressure to counteract the pressure of the incoming water
Answer: d. they have cell walls, which provide pressure to counteract the pressure of the incoming water
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In this food web, the sunflower is __________
a. the primary producer b. the primary consumer c. the autotroph d. both the primary producer and autotroph
Botulinum toxin, or "botox", has become popular for cosmetic surgery. The toxin prevents neurosecretory vesicles from docking at the plasma membrane and releasing neurotransmitter. How would this toxin affect the neuromuscular junction?
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If the process of 'zipping up' of chromosomes before crossing over were impaired in germ cells, would all of the resulting sperm have the exact same DNA, with no diversity? Why or why not?
What will be an ideal response?
Scorpion muscle contraction is fueled directly by energy derived from
a. lactic acid. b. ADP. c. ATP. d. ethanol.