Only birds have _____
a. a cloaca c. feathers
b. a four-chambered heart d. amniote eggs
C
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Which of the following can cause double-stranded breaks in DNA?
A. ultraviolet radiation B. cosmic rays C. gamma rays D. microwaves E. All of the choices given are correct.
The results of Lederberg and Tatum’s experiments with E. coli auxotrophs indicated that ____
a. bacteria can be transformed when free DNA is available in their environment b. bacteria are able to exchange genetic material with eukaryotic organisms c. bacteria reproduce by sexual rather than asexual reproduction d. genetic recombination can occur in bacteria e. genetic recombination does not occur in bacteria since they do not undergo meiosis
In the human diet, linoleic and linolenic acids are the only essential fatty acid acids
Indicate whether the statement is true or false.
Blood pH is kept near a value of 7.3-7.5 because of
a. salts. b. buffers. c. acids. d. bases. e. water.