Resistance to tripping and falling seems to be most directly correlated to a person's
a. age.
b. speed of reaction.
c. strength of hip and trunk muscles.
d. number of slow-twitch muscle fibers.
e. amount of exercise.
B; The resistance to falling is associated with how fast a person can respond, which is in turn correlated with the proportion of fast-twitch muscle fibers (not slow-twitch, choice d). Age, strength, and amount of exercise all correlate with resistance to some degree, but because they are related to the number of fast-twitch fibers, which is the real issue.
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A. the 16S rRNA B. tRNA. C. mRNA. D. snRNA. E. aminoacyl-tRNA synthetase.
Thomas Malthus proposed that ____
a. the food supply increases faster than the population b. the population increases faster than the food supply c. the food supply and population increase at the same rate d. artificial selection is the key to evolution e. natural selection is the key to evolution
Which pair of organelles is responsible for supplying energy (in the form of ATP) to eukaryotic cells?
A) Ribosomes and mitochondria B) Chloroplasts and mitochondria C) Chloroplasts and ribosomes D) Mitochondria and lysosomes E) Golgi apparatus and ribosomes
________ occurs when an external signal does NOT directly enter the cell but instead is detected by a sensor that transmits it to the rest of the regulatory machinery
a. Quorum sensing b. Sensory transduction c. Signal transduction d. Two-component regulation