A ____ mutation in snails can reverse the direction of shell coiling, which ____ mating
a. single; encourages
b. single; prohibits
c. double; encourages
d. double; prohibits
e. large deletion; encourages
ANSWER: b
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Which of the following is a list of the materials required for PCR?
A. Primers, Taq DNA polymerase, nucleotides B. Reverse transcriptase, Taq DNA polymerase, nucleotides C. Primers, Taq RNA polymerase, nucleotides D. Reverse transcriptase, Taq RNA polymerase, nucleotides
A denurated protein has lost its _____
a. hydrogen bonds c. function b. shape d. all of the above
How do prions, which are misfolded proteins, infect organisms?
a) Prions only arise through spontaneous mutation. They are not transmissible. b) Prions recruit ribosomes to make more copies of the wrong form of the protein. c) Prions enter brain cells and cause normal forms of the protein to refold into the prion form. d) Prions enter brain cells through the lymphatic system and make copies of themselves. e) None of the above.
Halophilic bacteria prefer environments with
A) High salt concentrations B) Acidic environments C) Humans cells D) Low oxygen