The damage caused by main-chain scission, cross-linking, and point lesions is permanent.
a. true
b. false
Ans: b. false
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The brain controls organ system function only through direct contact with sympathetic or parasympathetic nerves.
Answer the following statement true (T) or false (F)
Species interactions within a community rarely involve only two species
Indicate whether the statement is true or false
In producing Dolly, the first cloned sheep, how many different sheep were involved, either contributing cells or acting as a surrogate mother?
A) three B) four C) six D) two
Voltage-gated channels contain charged protein domains, which are sensitive to changes in membrane potential. By responding to a threshold in the membrane potential, these voltage sensors trigger the opening of the channels
Which of the following best describes the behavior of a population of channels exposed to such a threshold? (a) Some channels remain closed and some open completely. (b) All channels open completely. (c) All channels open partly, to the same degree. (d) All channels open partly, each to a different degree.