Question

a gene can be defined as which of the following?
○ a specific chemical found in the nucleus of a cell that governs all aspects of its structure and function
○ a foreign protein that causes the immune system to create an antibody
○ an identifiable portion of a strand of dna that contains the instructions for a single structure or function
○ a small, nontoxic amount of a foreign substance

Explanation:

A gene is a segment of DNA that contains the instructions for a particular trait or function. It is not a chemical governing all - cell aspects, nor a foreign protein for antibody - creation, nor a small non - toxic foreign substance.

Answer:

an identifiable portion of a strand of DNA that contains the instructions for a single structure or function