You notice that water is running off the feathers of a bird in the rain. The reason is probably that the bird has coated the feathers with ________, which keeps the water out of them
A) lipids B) proteins C) nucleic acids D) polysaccharides
Answer: A
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Which of the following can be a transdominant mutation in partial diploid cells?
A) lacZ- B) PlacI- C) lacIS D) lacY- E) lacI-
Which of the following can be mutated to result in constitutive expression from the lac operon?
A) lacZ and lacP B) lacZ and lacI C) lacO and lacI D) lacO and lacZ E) lacI and lacY
A(n) ________ organism require(s) oxygen for growth.
A. anaerobic B. facultative anaerobic C. aerotolerant D. obligate aerobic E. aerotolerant and an anaerobic
The discrepancy between the number of microbial cells observed by microscopic examination and the number of colonies that can be cultivated from the same natural sample may be due to ________.
A. microbial motility B. incorrect culture conditions C. nonviable organisms D. nonviable organisms and incorrect culture conditions