I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "The vast majority of living organisms encode their genes in long strands of DNA (deoxyribonucleic acid). DNA consists of a chain made from four types of nucleotide subunits, each composed of: a five-carbon sugar (2'-deoxyribose), a phosphate group, and one of the four bases adenine, cytosine, guanine, and thymine.:2.1"?
A:
What can be found in living organisms' genes?