Question

atoms of carbon, oxygen, and hydrogen are found in all biological macromolecules. which macromolecules are made only of these three elements? (a) carbohydrates only (b) carbohydrates and lipids (c) carbohydrates, lipids, and nucleic acids (d) lipids, proteins, and nucleic acids (e) carbohydrates, proteins, and nucleic acids

Explanation:

Carbohydrates are composed of carbon, hydrogen, and oxygen. Lipids are made up of carbon, hydrogen, and oxygen (with a higher ratio of hydrogen to oxygen compared to carbohydrates). Proteins contain carbon, hydrogen, oxygen, and nitrogen (and sometimes sulfur). Nucleic acids have carbon, hydrogen, oxygen, nitrogen, and phosphorus. So, only carbohydrates and lipids are made solely of carbon, oxygen, and hydrogen.

Answer:

B. carbohydrates and lipids