Which of the following is not one of the major transmembrane proteins in tight junctions?
a. Claudin
b. JAM (junctional adhesion molecule)
c. Occludin
d. Thrombospondin
Ans: d. Thrombospondin
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Increasing the flow of Na+ ions into a neuron at rest (-70 mV initially) would trigger
A. hyperpolarization. B. depolarization. C. repolarization. D. active transport. E. None of the choices are correct.
An unscrupulous dog breeder has been selecting for dogs that have very large litters, with the goal of maximizing profits. Why might this strategy be counterproductive?
A. It will cost too much money to feed all those puppies. B. Litter size is not influenced by genetics. C. The puppies from large litters are likely to be malnourished, and the mother will have few resources to devote to future litters. D. Intrauterine cannibalism will reduce the number of puppies. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about the risks versus benefits of producing a large little of puppies? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following microorganisms associated with food poisoning thrives in cold storage?
A) Salmonella spp. B) Shigella spp. C) Clostridium botulinum D) Escherichia coli E) Listeria monocytogenes
During cell division a piece of a chromosome breaks off and reattaches to the same chromosome, but the piece is now in reverse order. How would this abnormality affect the chromosome?
a. An extra copy of the chromosome will be made to ensure normal function. b. The inverted section will be deleted to prevent problems. c. The chromosome will take on a circular configuration. d. Genes in the section that was inverted could lose normal function.