Question

in addition to carbon, which elements are found in all biological macromolecules?
calcium and hydrogen
nitrogen and oxygen
calcium and oxygen
hydrogen and oxygen
hydrogen and nitrogen

Explanation:

Biological macromolecules include carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates have elements C, H, O. Lipids mainly have C, H, O. Proteins have C, H, O, N. Nucleic acids have C, H, O, N, P. So in addition to carbon, hydrogen and oxygen are present in all. Calcium is not in all (e.g., not in most carbohydrates, lipids etc.). Nitrogen is not in carbohydrates and many lipids.

Answer:

hydrogen and oxygen