Symptoms of secondary syphilis include
a. generalized skin rash.
b. lesions.
c. fatal cardiovascular infections.
d. both a and c.
Answer: A
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Measuring its costs and benefits in terms of energy spent and/or gained, mutualism
A. is a lose-lose interaction. B. results in gain for both individuals. C. results in a gain for one individual and a loss for the other. D. results in a gain for one individual and neither a gain nor a loss for the other. E. none of these
Cotransduction establishes the general order of genes on a bacterial chromosome, while conjugation is more specific and thus may be used to establish precise distances
Indicate whether the statement is true or false
A new DNA strand elongates only in the 5' to 3' direction because
A) DNA polymerase begins adding nucleotides at the 5' end of the template. B) Okazaki fragments prevent elongation in the 3' to 5' direction. C) the polarity of the DNA molecule prevents addition of nucleotides at the 3' end. D) replication must progress toward the replication fork. E) DNA polymerase can only add nucleotides to the free 3' end.
Synthesis of an inducible enzyme requires
A. substrate bound to repressor. B. corepressor and repressor binding to operator. C. repressor alone bound to operator. D. substrate bound to promoter.