The release of testosterone requires
a. GnRH.
b. luteinizing hormone.
c. Sertoli cells.
d. GnRH and luteinizing hormone.
e. GnRH, luteinizing hormone, and Sertoli cells.
Answer: d
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Because most herbivores do not produce cellulase, they have specialized compartments in their digestive tracts that (select all correct choices):
A. provide appropriate temperature and pH for breaking down plant material. B. house large populations of bacteria and other single-celled symbionts that do produce cellulase. C. grind up the plant material using muscular gizzards or other structures. D. secrete alternative enzymes that carry out the same function as cellulase. E. ferment nutrients in the hindgut.
The collars on the cells of choanoflagellates have the function of:
A. protecting the flagellum B. filtering bacterial food from the water C. directing currents away from the flagellum D. storing waste materials of the cell E. attaching to the substrate
Which of the following is NOT true regarding
coenzymes?
a. they are cofactors. b. ATP is an example of a coenzyme. c. NaCl is an example of a coenzyme. d. They are often modified in chemical reactions. e. They may carry electrons
What is the genotype of “B”?
a. aa b. Aa c. AA d. either aa or Aa e. either Aa or AA