A bacterial allele that provides resistance to the antibiotic streptomycin is
A) neither beneficial nor detrimental to the cell.
B) beneficial to the cell in the presence of any antibiotic.
C) beneficial to the cell in the presence of streptomycin.
D) always detrimental to the cell.
E) always beneficial to the bacterial cell.
C
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The "threshold" potential of a membrane is the _____
A) point of separation from a living to a dead neuron B) lowest frequency of action potentials a neuron can produce C) minimum hyperpolarization needed to prevent the occurrence of action potentials D) minimum depolarization needed to operate the voltage-gated sodium and potassium channels E) peak amount of depolarization seen in an action potential
True or False: Microorganisms dominated Earth's ecosystems for most of the planet's history
A. true B. false
The part of the eye that may be colored (e.g., brown, blue, green, or gray) is the
a. retina. b. sclera. c. choroid. d. cornea. e. iris.
A monophyletic group has how many common ancestors?
A. One B. Two C. Three D. Many E. It is variable