Muscle cells shorten because
A. they get bigger in diameter.
B. sodium ions flow along the surface of the actin molecule.
C. myosin molecules shorten.
D. actin molecules slide by myosin molecules.
D. actin molecules slide by myosin molecules.
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The Neanderthal Genome Project discovered that some humans likely interbred with Neanderthals. Which group of humans probably did not?
Home-canned foods should be boiled before consumption to prevent botulism. Considering that this treatment does NOT destroy endospores, why would it be helpful in preventing the disease?
A. Because it would destroy the vegetative cells, and only the vegetative cells cause the disease. B. Because it would at least weaken the endospores, making them more susceptible to elimination by our immune system. C. Because the heat would denature the botulism exotoxin and inactivate it. The exotoxin is what leads to the disease symptoms, so this would make the food safer. D. Because the heat would denature the botulism endotoxin and inactivate it. The endotoxin is what leads to the disease symptoms, so this would make the food safer.
Which of the following does NOT characterize most
prokaryotes? a. no nucleus b. a single circular chromosome c. cell wall d. complex internal membranes e. great metabolic diversity
C4 plants
What will be an ideal response?