Leaving Certificate Biology Practice Test

A gene is a defined stretch of DNA that contains the instructions to make a functional product, usually a protein. This specific sequence is transcribed into RNA and then translated to form the protein, so the region of DNA that carries that information is called a gene. It sits at a particular position on a chromosome, known as its locus, and there can be different versions at that position called alleles. A chromosome is the larger structure that carries many genes. So the term that best fits a section of DNA coding for a protein is gene.