Which of the following is true of a codon?
a. It never codes for the same amino acid as another codon.
b. It can code for more than one amino acid.
c. It can be either in DNA or in RNA
d. It is the basic unit of protein structure

검증된 단계별 안내

Understand the definition of a codon: A codon is a sequence of three nucleotides in RNA that corresponds to a specific amino acid or a stop signal during protein synthesis.

Recall that codons are found in messenger RNA (mRNA) and are read during the process of translation to assemble amino acids into a polypeptide chain.

Analyze option (A): This is incorrect because multiple codons can code for the same amino acid due to the redundancy of the genetic code (e.g., both UUU and UUC code for phenylalanine).

Analyze option (B): This is incorrect because each codon specifies only one amino acid or a stop signal; codons do not code for multiple amino acids.

Analyze option (C): This is incorrect because codons are specifically found in RNA, not DNA. DNA contains triplets, which are transcribed into codons in RNA.

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Codon Definition

A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid or a stop signal during protein synthesis. Codons are essential for translating genetic information into proteins, as they dictate the order in which amino acids are assembled.

Genetic Code

The genetic code is the set of rules by which information encoded in genetic material is translated into proteins. It is nearly universal among organisms and consists of 64 codons that specify 20 amino acids, allowing for redundancy where multiple codons can code for the same amino acid.

Difference Between DNA and RNA Codons

Codons can be found in both DNA and RNA, but they play different roles in the two types of nucleic acids. In DNA, codons are transcribed into mRNA, which then carries the genetic information to ribosomes for translation into proteins. This distinction is crucial for understanding the flow of genetic information.