A phage that can carry a larger piece of a bacterial chromosome would have what type of effect on cotransduction frequencies?
A. Raise the cotransduction frequency
B. Lower the cotransduction frequency
C. Have no effect on the cotransduction frequency
A
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Allelochemicals are active in preventing
(a) herbivore feeding. (b) germination of plant competitors. (c) infection by pathogens. (d) all of the above.
The hallmark feature of peroxisomal diseases is the presence of
A) hydrolases. B) very long chain fatty acids. C) long chain gangliosides. D) an abundance of myelin. E) amyloid plaques.
Would you expect the number of virions to be the same if you measured them by the plaque assay or by counting using the electron microscope? Why?
A. Yes-both methods measure the total number of virus particles in a solution. B. No-the plaque assay only measures viable virus particles, while the electron microscope cannot distinguish between defective and viable virus. C. No-you cannot count virus particles by using a plaque assay. You can only get a relative difference in quantity from one preparation of virus particles to another with this method. D. Yes-only fully functioning viruses will be released from a host cell, so the quantified number of virus particles in a plaque assay should be identical to the number of free virus particles counted by electron microscopy within a given preparation.
Sister taxa are defined as those that __________.
a. are each other's closest relatives b. reproduce only asexually c. are members of the same family d. occupy the same geographic location e. make up a lineage in which one is descended from the other