In which cell division do the DNA's of mom and dad match up?
A. Meisosis
B. Mitosis
Answer: A. Meisosis
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Secondary disinfection of drinking water is necessary to
A) maintain sufficient residual in the water distribution system to inhibit microbial growth. B) prevent the formation of biofilms on pipes in the water distribution system. C) neutralize taste- and odor-producing organic compounds. D) kill Cryptosporidium and other resistant pathogens.
Natural selection is limited in its effectiveness in preserving new favorable mutations in an environment that
Populations of hospital microbes contain mutations that protect them from specific antibiotics, that is, they are antibiotic resistant. The selecting agent in this situation is
A. antibiotics. B. the patients. C. the physicians. D. nurses.
What is meant by “redundancy” in gene expression?
(A) all tRNA molecules can carry more than one amino acid (B) each amino acid can have more than one codon (C) one codon can code for more than one amino acid incorrect (D) mRNA is copied twice in the nucleus (E) none of these are true