Question

question 24 of 25
which sentence describes how the structure of dna determines the
expression of genes?

a. a gene is a sequence of nucleotides in dna that codes for a
protein with a specific function.

b. a gene is expressed when two strands of dna are combined to
form a macromolecule with a specific function.

c. a gene is expressed when amino acids are combined to build a
molecule of dna with a specific function.

d. a gene is a sequence of amino acids in a polypeptide that codes
for a dna molecule with a specific function.

Explanation:

A gene is a DNA nucleotide sequence. DNA's structure (nucleotide sequence) determines gene expression. Through transcription (DNA to RNA) and translation (RNA to protein), the nucleotide sequence codes for a specific - function protein.

• Option B is wrong as DNA is double - stranded already, and gene expression isn't about combining two DNA strands to form a macromolecule.
• Option C is incorrect because amino acids build proteins, not DNA. DNA is made of nucleotides.
• Option D is wrong since genes are in DNA (nucleotide sequences), not polypeptides (amino - acid sequences).

Answer:

A. A gene is a sequence of nucleotides in DNA that codes for a protein with a specific function.