An example of ligand-gated ion channels is _____
A) the spreading of action potentials in the heart
B) acetylcholine receptors at the neuromuscular junction
C) cAMP-dependent protein kinases
D) action potentials on the axon
B
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Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of _____
A) purines is always larger than the number of pyrimidines B) pyrimidines is always larger than purines C) cytosines is always the same as adenines D) guanines is always the same as thymines E) purines is always the same as pyrimidines
In which phase does the centromere break?
What will be an ideal response?
Consider a nerve cell with an internal Cl- concentration of 50 mM, a membrane potential of 60 mV and an external Cl- concentration of 100 mM. Each of the following is true for Cl- import into the cell except
A) import is down a concentration gradient. B) import is down an electrochemical concentration gradient. C) import ?G is positive. D) import requires energy input. E) All are true.
The statement "The virulence of many pathogens in humans may not be a target of selection itself, but rather an accidental by-product of selection on other traits" describes ________
A) the coincidental evolution hypothesis B) the shortsighted evolution hypothesis C) the trade-off hypothesis D) the energy-balance hypothesis