Question

level 4 q3
what is a gene?
a. a protein within dna
b. a set of homologous chromosomes
c. a molecule within dna
d. a segment of dna that codes for a protein

Explanation:

A gene is defined as a specific segment of deoxyribonucleic acid (DNA) that contains the genetic instructions to synthesize a functional product, typically a protein (or in some cases, a functional RNA molecule). Option A is incorrect because genes are not proteins; DNA contains genes, and proteins are encoded by genes. Option B is wrong as homologous chromosomes are pairs of chromosomes, not genes. Option C is inaccurate because a gene is a segment of the DNA molecule, not a separate molecule within DNA.

Answer:

D. A segment of DNA that codes for a protein