Which of the following is a sterilizing agent?
A. ozone
B. hydrogen peroxide
C. peracetic acid
D. dish soap
E. peracetic acid and hydrogen peroxide
Answer: E
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Some protist cell surfaces have __________, including silica or calcium carbonate.
Fill in the blank(s) with the appropriate word(s).
The hormone ACTH stimulates hormone production by the adrenal medulla.
a. true b. false
What subphylum do woodpeckers and shrews belong to?
A. Animalia B. Cephalochordata C. Chordata D. Urochordata E. Vertebrata
lacI–d mutations
a. can inactivate the repressor even if only one of the four subunits is mutant. b. occur in the region of the gene encoding the inducer binding site. c. are cis-acting. d. can only inactivate the repressor if all four subunits are mutant. e. result in the lac operon being permanently repressed.