At rest, neurons exhibit a negative membrane potential. This is most DIRECTLY due to
A. movements of negatively charged proteins and nucleic acids across the membrane.
B. passive leakage of Na+ions across the membrane.
C. passive leakage of K+ions across the membrane.
D. movement of Na+ ions through voltage-gated Na+ channels.
E. movement of K+ ions through voltage-gated K+ channels.
C. passive leakage of K+ions across the membrane.
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The key characteristic of third-generation sequencing is the ability to sequence single molecules of DNA
Indicate whether the statement is true or false.
Antiviral drugs are often difficult to develop, largely because
A. viruses are more abundant in the body than bacterial cells. B. viruses are obligate intracellular parasites so the drugs must enter the host cell and often cause toxic side effects in order to destroy the virus. C. viruses are more pathogenic than bacterial cells. D. viruses are much smaller than bacterial cells.
A marsupial is a(n)
A) mollusk. B) reptile. C) amphibian. D) bird. E) mammal.
Which of the following characteristics indicates that two organisms are closely related?
A) Both are cocci. B) Both ferment lactose. C) Their DNA can hybridize together. D) Both normally live in clams. E) Both are motile.