The nerve impulse moves along the neuron because
A. a current flows along the cell.
B. sodium ions flow from one end of the cell to the other.
C. there is a high concentration of sodium ions at one end of the cell and a high concentration of potassium ions at the other end of the cell.
D. depolarization of one portion of the nerve cell membrane changes the permeability of the adjacent portion of the membrane, allowing it to depolarize as well.
D. depolarization of one portion of the nerve cell membrane changes the permeability of the adjacent portion of the membrane, allowing it to depolarize as well.
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Cytological examination of resting and contracted muscle provides important support for our current model for how skeletal muscle contracts. This evidence includes the observation that during contraction the
A) Z lines move farther apart. B) lengths of the thick and thin filaments change significantly. C) microtubules disassemble. D) muscle fibers change color. E) H zone becomes smaller.
What type of procedure is appropriate to isolate revertants from a population of threonine auxotrophic cells?
A. Threonine auxotrophic revertants could not be isolated on any type of media. B. Grow the auxotrophic cells on an agar plate without threonine; any colonies that form are presumed revertant. C. Grow the auxotrophic cells on and agar plate with threonine; any colonies that form are presumed revertant. D. Grow the auxotrophic cells in broth with threonine; if the broth becomes cloudy, revertants are presumed present.
Humans have different blood types, including AB, A, B, and O. Human blood type AB is a trait that is the result of what pattern of inheritance?
A) sex-linked inheritance B) dominance C) codominance D) incomplete dominance
What is the main sugar used by cells for energy?
A. sucrose B. glucose C. aspartame D. any polysaccharide