Question

a gene is best described as a segment of dna that: codes for the synthesis of a specific carbohydrate. contains the instructions for building a specific protein. determines the overall size of a chromosome.

Explanation:

Genes are segments of DNA that carry the genetic information necessary to synthesize specific proteins through the processes of transcription and translation. They do not code for carbohydrates directly and do not determine chromosome size.

Answer:

Contains the instructions for building a specific protein.