Lederberg and Tatum's experiments demonstrated that
A. the genetic transfer occurred when the bio+, met+ phe-thr- strain transferred DNA to the bio-met- strain.
B. bacteria must be in physical contact in order for bacteria to exchange genetic material.
C. bacteria do not release DNA into the environment for other bacteria to take up.
D. bacteria can acquire genetic material from each other.
E. All of these observations were made by Lederberg and Tatum.
Answer: D
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Aflatoxins
A. are produced by Aspergillus. B. are possible carcinogens. C. may be found in peanuts. D. are toxins. E. All of the choices are correct.
All of the following methods are employed to identify pathogens in clinical specimens EXCEPT
A. biochemical tests. B. special stains and microscopy. C. culture on a variety of all-purpose, selective, and/or differential media. D. molecular testing for nucleic acids. E. immunoassays. F. There are no exceptions here. All of these methods are used to identify pathogens.
Condensation reactions are also referred to as
a. hydrolysis. b. dehydration synthesis. c. lytic reactions. d. recombination. e. transmutation.
Missense mutations are a type of frameshift mutation.
a. true b. false