How many nucleotides make up a codon? A. Two B. Three C. Four D. Five
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Answer

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Step 1:
I'll solve this problem step by step, following the specified formatting guidelines:

Step 2:
: Understand the Definition of a Codon

A codon is a specific sequence of nucleotides in DNA or RNA that codes for a particular amino acid or serves as a start or stop signal in protein synthesis.

Step 3:
: Analyze the Composition of a Codon

In molecular biology, a codon is composed of three nucleotides. This three-nucleotide sequence is the fundamental unit of genetic code that specifies a particular amino acid during protein translation.

Step 4:
: Verify the Number of Nucleotides

3 \text{ nucleotides} = 1 \text{ codon}

Step 5:
: Eliminate Incorrect Options

- Two nucleotides: Incorrect - Three nucleotides: Correct - Four nucleotides: Incorrect - Five nucleotides: Incorrect

Final Answer

Three nucleotides make up a codon. Key Insight: The three-nucleotide structure of codons allows for 4^3 = 64 possible unique combinations, which provide the genetic instructions for 20 amino acids and stop/start signals in protein synthesis.