What happens when a resting neuron's membrane depolarizes?
A) There is a net diffusion of Na+ out of the cell.
B) The equilibrium potential for K+ (EK) becomes more positive.
C) The neuron's membrane voltage becomes more positive.
D) The neuron is less likely to generate an action potential.
E) The cell's inside is more negative than the outside.
Answer: C
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One surprise from comparative genome projects is that
A) all species examined so far have the same genes. B) we do not know the function of a great many genes. C) small organisms can have large genomes. D) large organisms can have small genomes.
Georges Cuvier proposed catastrophism and the principle of superposition after observing
A. the similarities and differences among closely related species. B. anatomical differences. C. fossil similarities in the fossil records. D. variability in populations of islands. E. observed genetic patterns of inheritance among plants and animals.
Which best describes the class Halobacteria?
A) archaeans that require highly saline environments B) archaeans that require methane-rich environments C) bacteria that require highly arid environments D) bacteria that require highly saline environments
Please choose the answers that correctly describe the virulence factors of Staphylococcus aureus.
> Coagulase enzyme causes blood plasma to clot. > Staphylokinase enzyme destroys red blood cells. > Penicillinase enzyme allows S. aureus to grow in the presence of penicillin. > Hyaluronidase enzyme promotes invasion of host tissues. > Lipase enzyme causes a fever in the host.