A concept presented by Charles Lyell, called ____, contendsthe geological processes that sculpted Earth’s surface
over long periods of time are exactly the same as the processes observed today
a. catastrophism
b. sedimentation
c. orthogenesis
d. gradualism
e. uniformitarianism
ANSWER: e
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Which best describes the source of B. cepacia infections?
a. Rice paddies b. Medical devices c. Oropharynx of animals d. Rodents
When a neuron undergoes a change in membrane potential that is proportional to (i.e., varies depending on) the strength of the stimulus given to that neuron, this is referred to as a/an
A. equilibrium potential. B. action potential. C. resting potential. D. reversal potential. E. graded potential.
What powers ATP synthase directly?
a. electron transfer b. NADH and FADH2 c. carbohydrate metabolism
d. the proton gradient e. protein complexes
An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. B) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy. C) Without this treatment, the mother's immune system will attack only her own blood cells. D) Without this treatment, antibodies will be formed in breast milk, which could harm the baby.