In a ribbon model of a polypeptide, broad arrows indicate:
A. -sheets.
B. -helices.
C. disulfide linkages.
D. -sheets and -helices.
E. All of these choices are correct.
Answer: A
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The result obtained in Jacob and Monod's merodiploid analysis that suggested the lacI region acts in trans to regulate the lac operon was:
A. a nonfunctional lacI mutant is rescued by a wild-type lacI allele. B. a nonfunctional lacI mutant cannot be rescued by a wild-type lacI allele. C. a nonfunctional lacO mutant is rescued by a wild-type lacO allele. D. a nonfunctional lacO mutant cannot be rescued by a wild-type lacO allele.
Which is true of MRSA strains?
A. They are all resistant to vancomycin. B. They carry the R plasmid. C. They may be susceptible to linezolid. D. The carry the R plasmid AND they may be susceptible to linezolid.
Scientists may change how an organism is classified for various reasons. Which of the following would be the most likely reason for the classification of an organism to change?
A) The organism could no longer interbreed with members of its own species. B) The organism grew significantly larger. C) The organism changed its habitat from a warmer to colder climate. D) The organism produced several offspring
In terms of number of species, the most successful terrestrial vertebrates that invaded the air are
A. birds. B. insects. C. flying monkeys. D. bats. E. pterosaurs.