Quiz 12 2006 key - Quiz 12 Key, Fall 2006 Bio 181, Sections...

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Quiz 12 Key, Fall 2006 Bio 181, Sections 7, 8H Once inside a plant cell, viruses spread by a. diffusion. b. Brownian motion. c. plasmodesmata. d. attaching to a shared endoplasmic reticulum. e. the movement of water each time it rains. Answer: c When a met bio strain of bacteria is mixed with a thr leu strain, wild-type bacteria result at a rate of one in every 10 7 cells. Why is it not possible that this is the result of mutation? a. The wild type would have to be a double mutation, which is extremely rare. b. The wild type would have to be a mutation in four genes, which is extremely rare. c. The wild type would have to be a deletion, which is extremely rare. d. Mutations can occur only in response to a mutagen. e. Bacterial genes do not mutate. Answer: a In transduction, a. only a particular part of the bacterial chromosome can be transferred. b. a part of the bacterial chromosome may be transferred. c. only the F plasmid can be transferred. d. only the part of the bacterial chromosome near the F plasmid can be transferred. e. None of the above Answer: b What is the difference between a plasmid and a transposable element? a. Plasmids exist in many copies in the cell, whereas a transposable element exists in a single copy. b. A plasmid replicates independently of the cell; a transposable element does not. c. A plasmid has an origin of replication; a transposable element does not. d. A plasmid exists independently in the cell cytoplasm, whereas a transposable element is integrated into another larger DNA molecule. e. None of the above
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Quiz 12 2006 key - Quiz 12 Key, Fall 2006 Bio 181, Sections...

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