When lifting a heavy object, the strength of leg muscle contractions is determined by the
A) amount of ATP used by each active sarcomere during muscle contraction.
B) number of calcium ions released by the sarcoplasmic reticulum.
C) frequency of action potentials and number of muscle fibers stimulated.
D) number of thick and thin filaments involved in each sarcomere during contraction.
C
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Which of the following enzymes is responsible for initiating certain types of base excision repair?
A. DNA polymerase B. DNA ligase C. AP endonuclease D. DNA uracil glycosylase E. None of the answer options is correct.
The primary site of photosynthesis in most plants is the:
A. stems. B. roots. C. shoots. D. buds. E. leaves.
Which of the following defines ecological resistance?
a. the ability of an ecosystem to remain at equilibrium despite disturbances b. the ability of a species or group of species to synthesize food molecules c. the speed at which an ecosystem recovers equilibrium after being disturbed d. the actions required for the species in a system to remain the same
All known organisms appear to translate genetic information to protein molecules via the same genetic code. This finding strongly supports the hypothesis that __________.
a. all organisms are descended from a single common ancestor b. there's only one possible way to encode information in a macromolecule c. the genetic code is of relatively recent evolutionary origin d. scientists have yet to accurately decipher the genetic code e. None of the listed responses are correct.