A polypeptide has the following amino acid sequence: Met-Ala-Gln-Arg-Glu-Leu. This polypeptide was mutated to produce the following mutant sequence: Met-Ala-Gln-Gly-Glu-Leu. Which describes the MOST likely type of mutation that occurred?
A. nonsense mutation
B. in-frame mutation
C. frameshift mutation
D. neutral mutation
E. missense mutation
Ans: E. missense mutation
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The depolarization phase of an action potential requires _____
A) opening of K+ channels in the membrane B) opening of Na+ channels in the membrane C) opening of Ca2+ channels in the membrane D) a K+ concentration gradient across the membrane E) a Ca2+ concentration gradient across the membrane
Which of the following countries is most likely to have a pyramid-shaped age structure?
a. Niger b. The United States c. Sweden d. Italy
Estuaries have very low bioproductivity and diversity
Indicate whether the statement is true or false
In the DNA isolation process, detergent was used to stabilize
a. the cellular and nuclear membranes. b. emulsify cellular and nuclear membranes. c. homogenize the cellular and nuclear membranes. d. neutralize the cellular and nuclear membranes. e. liquify the cellular and nuclear membranes.