Testosterone is produced and secreted by
a) spermatogonia
b) sustentacular cells
c) seminiferous tubules
d) interstitial cells
Ans: d) interstitial cells
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An aquatic ecosystem that may include protists and bacteria as producers in a well-lit zone and detritus feeders in a
deeper dark zone is a(n) ____.
a. estuary b. stream c. lake d. coral reef e. hydrothermal vent
Species such as mice have a better chance of surviving sudden environmental change than elephants because
A. elephants reproduce much more slowly than mice. B. elephants require larger habitats than mice. C. elephants eat more than mice. D. elephants live longer than mice. E. elephants have a more selective diet than mice.
When you hear, the ________ vibrates. I) eardrum II) hammer III) stirrup
A) I B) II C) III D) I, II, and III
Some complement proteins
A) induce antibody formation by phagocytic cells. B) help trigger the inflammatory response. C) are released by natural killer cells to attack cancer and virus-infected cells. D) replace T cells in the cell-mediated response.