The arrival of an action potential at a synaptic terminal causes voltage-gated potassium channels to open
____________________ Indicate whether the statement is true or false.
False - calcium
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Reinforcement is most likely to drive the evolution of
A. prezygotic isolating mechanisms, because selection favors alleles that prevent hybridization. B. postzygotic isolating mechanisms, because selection acts after the formation of hybrids. C. prezygotic isolating mechanisms, because selection favors alleles that promote hybridization. D. postzygotic isolating mechanisms, because hybrids have low fitness relative to the parents.
Which of the following is NOT a primary taste
sensation?
a. sweet b. sour c. bitter d. umami e. all of these are primary taste sensations
The warmest area of a lake during the summer is the ________.
A. limnion B. hypolimnion C. thermocline D. epilimnion E. benthic zone
A new mutation that arose in one copy of gene X in a somatic cell resulted in the formation of a tumor. Which of the following pieces of evidence best describes how the new mutation directly caused the tumor?
A) Protein X normally stimulates cell division, and the mutation created an overactive version of protein X B) Protein X normally activates a growth hormone receptor, and the mutation decreased the stability of protein X. C) Protein X normally prevents passage through the cell cycle, and the mutation created an overactive version of protein X. D) Protein X normally regulates gene expression, and the mutation created an underactive version of protein X that blocked the cell cycle.