Question

which of the following best describes a gene?
a. a region of dna that codes for a protein product
b. a chain of proteins that make up a dna sequence
c. a sequence of amino acids that codes for a protein product
d. an expressed trait that makes up a dna sequence

Explanation:

A gene is a segment of DNA that contains the instructions for building a specific protein product. Proteins are made up of amino - acids which are encoded by the DNA sequence in genes. Option B is incorrect as DNA is made of nucleotides, not proteins. Option C is wrong because amino - acids are the building blocks of proteins, not what codes for them in the context of genes. Option D is incorrect as expressed traits are the result of gene expression, not what makes up a DNA sequence for a gene.

Answer:

A. a region of DNA that codes for a protein product