The purpose of the basic unit of DNA on a chromosome is to a. encode instructions for making a particular protein molecule.
What does DNA do?
The basic unit in DNA is known to carry instructions which is used to make a particular protein.
That protein is the gene which then decides the different characteristics that a human being has.
In conclusion, option A is correct.
Find out more on deoxyribonucleic acid at https://brainly.com/question/26529107.
