A mutation has occurred during DNA replication while the cell was preparing to divide.  As a result of this, the codon ACU of mRNA has now become ACC.  Interestingly, there is no change to the protein being made.  Why not?

A. This is not a mutation that causes a big change, so there is no change to the protein being made.
B. This is a silent mutation.
C. The original amino acid isoleucine was changed to leucine, but they are the same variation of amino acid so no change to the protein.
D. The mutation was fixed, and even though the codon is now ACC the correct amino acid is put into place for the normal protein.


Answer: B

Biology & Microbiology

You might also like to view...

Most E. coli antisense RNAs work with a protein called ________ to regulate their target mRNAs.

A. Hfq B. MicF C. CAP D. None of the choices are correct.

Biology & Microbiology

Vacuoles for ingesting food and regulating their water balance are characteristic of 

A. sporozoans. B. trypanosomes. C. ciliates. D. algae. E. spirochetes.

Biology & Microbiology

A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage

a. fermentation b. photosynthesis c. sexual reproduction d. aerobic respiration e. anaerobic respiration

Biology & Microbiology

Which of the following is NOT a factor that

contributed to the production of coal from the remains of Carboniferous vegetation? a. heat b. pressure c. drying d. decomposition e. compaction

Biology & Microbiology