Which of the following can act as opsonins on bacteria, thus enhancing phagocytosis?
What will be an ideal response?
antibodies and complement proteins
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A single motor neuron and the population of muscle fibers that it innervates is called the:
A. motor unit. B. motor endplate. C. neuromuscular junction. D. excitation-contraction coupling. E. twitch fiber.
Which of the following statements best describes the benefit of lichens for humans?
A. Lichens can be used to monitor levels of chemical pollutants in the air. B. Lichens can be used to monitor radiation levels. C. Lichens begin soil formation by breaking down parent rock. D. Lichens fix nitrogen. E. all of the choices provided
Histones are the ____
a. major class of proteins in chromatin b. initiators of DNA replication c. cause of SARS d. genes that encode for deoxyribose e. molecules that prevent strong hydrogen bonding
Scientists have discovered that when they provide supplemental food for hares, their density tripled. The figure above shows cycles of lynx and hare populations over a century's time. What do you predict would happen to the lynx and hare populations in an area where hares were provided supplemental food for one year?
A. The lynx population and the hare population would increase simultaneously, and stay at a stable high level permanently.
B. The hare population would increase, but the lynx population would be unaffected.
C. The lynx population would decrease as hares increased due to exploitative competition, then slowly rise back to the original level.
D. The lynx population would increase 1-2 years after the hares increased, then both would continue cycling down and up.