Spontaneous mutation occurs when
A) a DNA base is in an unstable tautomeric form as the replication fork arrives and a mismatched base is inserted.
B) a person smokes cigarettes or is exposed to a teratogen for many years.
C) the sugars and phosphates in the DNA double helix exchange places.
D) thymine temporarily becomes uracil.
A) a DNA base is in an unstable tautomeric form as the replication fork arrives and a mismatched base is inserted.
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A microbial cell's membrane is considered ________, because its internal constituents are maintained within the cell. However, it also imports and exports other molecules in response to its environment
A) differential B) microselective C) rigid D) semipermeable
Action potential propagation is the fastest in ____
a. a myelinated axon with a small diameter b. an unmyelinated axon with a small diameter c. a myelinated axon with a large diameter d. an unmyelinated axon with a large diameter e. all myelinated axons regardless of diameter
One disadvantage of a simulation model of an ecosystem is that it
a. does not take into effect interactions between organisms. b. does not take into effect nutrient availability. c. does not take into effect water availability. d. may not be accurate. e. may predict disastrous consequences.
In science, all results
a. are accepted as fact. b. are only hypotheses. c. have a probability of being incorrect. d. must be consistent with previous knowledge. e. are uncritically accepted by other scientists