The nervous system of fish is
A) well developed
B) non developed at all
Ans: A) well developed
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Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish Many scientists think that this wide range of functions indicates that prolactin _____
A) is a nonspecific hormone B) has a unique mechanism for eliciting its effects C) is an evolutionarily conserved hormone D) is derived from two separate sources E) interacts with many different receptor molecules
Which medium can be described as containing bile salts and dyes (e.g., bromothymol blue and acid fuchsin) to slow selectively the growth of most nonpathogenic gram-negative bacilli found in the gastrointestinal tract and allow Salmonella spp. and Shigella spp. to grow?
a. Thayer-Martin agar b. MacConkey agar c. Phenylethyl alcohol (PEA) d. Hektoen enteric agar
Why does a phospholipid on the cytoplasmic side of the cell membrane rarely flip to the extracellular side if both environments are polar?
a. The cholesterol does not allow lipids to move. b. The polar head group cannot pass through the nonpolar interior. c. The two sides have different functions and thus the phospholipid would not function properly. d. The cytoplasmic phospholipid is too big to pass through the membrane.
In female gamete development in humans and other vertebrates, the net result of meiosis is the production of one large egg and three small cells with very little cytoplasm. These three small cells:
a. degrade almost immediately. b. fertilize the egg. c. divide to form secondary egg cells. d. fuse together to form the placenta. e. act to nurse the egg cell.