How does DNA polymerase differ from RNA polymerase?
A. Only RNA polymerase adds new nucleotides to the 3' end of a growing chain.
B. Only RNA polymerase requires a primer.
C. Only DNA polymerase uses a template DNA strand to direct synthesis of a new nucleotide strand.
D. Only DNA polymerase has a proofreading ability.
D. Only DNA polymerase has a proofreading ability.
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A farmer decides to plant his crops in a desert. What adaptation would give them the greatest advantage in this climate?
A. C3 photosynthesis B. Mycorrhizal association C. C4 photosynthesis D. Mycoheterotrophy E. Symbiosis
Imagine you conduct a parabiosis experiment with two strains of mice, one of which lacks a functional leptin gene (ob strain) while the other lacks a functional receptor for this hormone (db strain). Which of the following outcomes would you observe?
A. no weight change in the db mouse B. decreased body weight in the db mouse C. decreased body weight in the ob mouse D. no weight change in the ob mouse E. increased body weight in the ob mouse
Which of the following is not true of bacterial conjunctivitis?
A. It can be transmitted through both direct and indirect contact. B. Infection produces a clear discharge from the eye. C. Treatment is with a broad-spectrum topical antibiotic. D. It can be caused by S. pyogenes or S. pneumoniae.
Which of the following will result when 1% to 5% agar is added to nutrient broth, boiled and cooled?
A. a liquid medium B. a mixed culture C. a solid medium D. a pure culture E. a contaminated medium