A mutation that changes a normal codon to a stop codon is called a

A. back mutation.
B. point mutation.
C. silent mutation.
D. missense mutation.
E. nonsense mutation.


Answer: E

Biology & Microbiology

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Biomagnification is a significant problem in aquatic communities. Levels of chemicals magnify (increase or accumulate) at each new link in a food chain. Use the following information to estimate the level of chemical X in a large-mouth bass. One alga can accumulate 1 unit of chemical X. Eachcopepod eats 15 algae. A minnow consumes 10 copepods, each large-mouth bass consumes 20 minnows.  

A.  15 units B.  20 units C.  30 units D.  150 units E.  300 units F.  3,000 units G.  20,000 units Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about biomagnification? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

Carbon 14 radioisotopes decay into stable

a. carbon 13 isotopes. b. nitrogen atoms. c. carbon atoms. d. nitrogen 15 isotopes. e. sodium atoms.

Biology & Microbiology

For geneticists, why is it important that genetic variability exist in the population under study?

What will be an ideal response?

Biology & Microbiology

Binding of the activating nucleotide di- or triphosphate causes the Ras protein to (first)

a. separate into subunits. b. split the terminal phosphate from the nucleotide-phosphate. c. undergo a conformational change. d. attach a farnesyl tail.

Biology & Microbiology