Which of the following are not topoisomers?
A. two molecules having the same number of base pairs but different linking numbers
B. two molecules having a different number of base pairs but the same linking number
C. two molecules having the same number of base pairs, but one is positively supercoiled and the other is negatively supercoiled
D. two molecules having the same number of base pairs, but one is underwound and the other is overwound
E. All of these choices are topoisomers.
B
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Which one of the following Gram-positive bacteria is most likely to be the cause of a nosocomial infection?
A) Clostridium difficile B) Staphylococcus aureus C) Streptococcus pneumoniae D) Streptococcus pyogenes
Based on the figure, which of the following statements is most likely accurate?
A. HIV arose more than once.
B. HIV and SIV are not genetically related.
C. The SIV strains will all have more sequence similarity with each other than with any of the HIV groups.
D. SIV only arose once.
E. HIV groups M, N, and O will be more similar to each other than to SIV.
Birds use specific songs, coloring, and mating dances to attract mates of their species (sexual selection). This is an example of reproductive isolation.
A. postzygotic B. parapatric C. sympatric D. prezygotic E. allopatric
A decrease in cortisol triggers a negative
feedback loop and causes release of a. adrenocorticotropin. b. cortisol. c. corticotropin releasing hormone. d. insulin. e. thyroxine