Question

question 4 (0.5 pts) a specific stretch of dna that programs the amino acid sequence of a polypeptide is a ______. options: gene, protein, nucleic acid, enzyme.

Explanation:

To solve this, we analyze each option:

• A gene is a specific DNA segment that codes for a polypeptide (by programming the amino acid sequence).
• A protein is a polypeptide or polymer of amino acids, not the DNA segment coding for it.
• Nucleic acid is a broader category (DNA/RNA), not a specific stretch coding for a polypeptide.
• An enzyme is a type of protein (or RNA) with catalytic activity, not the DNA segment coding for a polypeptide.

So the correct option is the one that matches the definition of a gene.

Answer:

A. gene