The glycosidic bonds in peptidoglycan are cleaved by
a. ampicillin.
b. lysozyme.
c. tetracycline.
d. Proteinase K.
Answer: B
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Experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal. Based on your knowledge of the function of statoliths, what would they observe?
A. The crayfish stayed upright. B. The crayfish lay on its side. C. The crayfish turned upside down. D. The crayfish attempted to escape by rapidly swimming backwards. E. None of these choices are correct.
Which cell junction type creates a barrier between two cells?
a. anchoring junctions only b. gap junctions only c. tight junctions only d. both anchoring junctions and gap junctions e. both anchoring junctions, tight junctions and gap junctions
When sodium ions diffuse into the axon’s
cytoplasm, the cytoplasm becomes
a. more positively charged. b. more negatively charged. c. neutrally charged. d. impermeable to more sodium ions. e. more than one of these
Assume that having three nostrils is inherited as a sex-linked trait on the Y chromosome. A man with three nostrils has a daughter who has a son with a man who has only two nostrils. What is the probability that the three-nostril man's grandson has three nostrils?
A. 25% B. 0% C. 100% D. 50%