Question

Which of the following statements best explains the fact that a mutation in a cell's DNA does not always result in an error in the polypeptide produced from that DNA sequence? (A) Some polypeptides are produced by a code other than a nucleic acid code. (B) The nucleolus can repair damaged DNA. (C) More than one codon code for the same amino acid. (E) Scientists have no idea why this phenomenon occurs.

Name: Problem 45, Chapter 1: SAT Biology E/M
Uploaded: 2020-01-18T19:49:54-08:00
Duration: 18 s
Channel: Anna Miller

   Which of the following statements best explains the fact that a mutation in a cell's DNA does not always result in an error in the polypeptide produced from that DNA sequence?
(A) Some polypeptides are produced by a code other than a nucleic acid code.
(B) The nucleolus can repair damaged DNA.
(C) More than one codon code for the same amino acid.
(E) Scientists have no idea why this phenomenon occurs.

SAT Biology E/M

Deborah Goldberg 5th Edition

Chapter 1, Problem 45

Instant Answer

Solved by Expert Anna Miller

01/18/2020

Step 1

In this process, the DNA sequence is transcribed into mRNA, which is then translated into a polypeptide chain. Each three-nucleotide sequence (codon) in the mRNA corresponds to a specific amino acid in the polypeptide chain. Show more…

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Which of the following statements best explains the fact that a mutation in a cell's DNA does not always result in an error in the polypeptide produced from that DNA sequence? (A) Some polypeptides are produced by a code other than a nucleic acid code. (B) The nucleolus can repair damaged DNA. (C) More than one codon code for the same amino acid. (E) Scientists have no idea why this phenomenon occurs.

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Key Concepts

Genetic Code Degeneracy

The genetic code is redundant, meaning that most amino acids are encoded by more than one codon. This redundancy allows certain changes in the DNA to occur without altering the amino acid that is inserted during protein synthesis, as different codons can specify the same amino acid.

Silent Mutation

A silent mutation is a change in a DNA sequence that does not lead to a change in the amino acid sequence of the resulting protein. This often happens because of the genetic code's degeneracy, ensuring that the mutation does not affect the overall structure or function of the protein.

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