The polysaccharide chains of the bacterial cell walls are made of alternating N-_______ and N-_______ acid.
a. acetylgalactose; acetylmuramic
b. acetylglucosamine; acetylmuramic
c. acetylglucosamine; acetylneuraminic
d. acetyl galactose; acetylneuraminic
Ans: b. acetylglucosamine; acetylmuramic
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A patient develops a high fever due to a Gram-negative pathogen. Which of the following is a certain mediator of illness in this case?
A. Exotoxin B. Endotoxin C. Both endotoxin and exotoxin D. Neither endotoxin nor exotoxin
Evidence that exposure to song is important in white-crowned sparrows learning to sing includes which of the following?
A. They need to hear songs from other male white-crowned sparrows from 10–50 days after hatching. B. They need to hear songs from any sparrow from 10–50 days after hatching to sing properly. C. White-crowned sparrows raised in a laboratory cannot learn how to sing properly. D. They must imprint on their father to learn how to sing their song properly. E. They will not produce any song at all if they do not hear other birds sing.
Steroid hormones bind with G-protein linked receptors in plasma membranes of target cells. Indicate whether the statement is true or false
It is FALSE that
A. coenzymes are needed in many reactions to enable the enzyme to function as a catalyst. B. water-soluble vitamins like thiamine, riboflavin, and niacin can be converted to coenzymes. C. coenzymes are nonprotein molecules. D. coenzymes remain unchanged during a reaction.