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
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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?
Carbon 14 radioisotopes decay into stable
a. carbon 13 isotopes. b. nitrogen atoms. c. carbon atoms. d. nitrogen 15 isotopes. e. sodium atoms.
For geneticists, why is it important that genetic variability exist in the population under study?
What will be an ideal response?
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.