Question

Which four elements occur in virtually all biological molecules?

Short answer

The four elements in all living organisms are carbon, oxygen, nitrogen, and hydrogen.

Step-by-step solution

Biomolecules

Protein, fats, and carbohydrates are called biomolecules. In various proportions, these biomolecules are all made of carbon, hydrogen, oxygen, and nitrogen.

Use of elements in biomolecules

Carbon, hydrogen, and oxygen are major components of carbohydrates, energy-giving molecules. Nitrogen is an essential protein component, along with the other three elements. Protein is a building block of organisms; it is also used in growth, development, and repair.

Thus, carbon, hydrogen, and oxygen are the four elements found in all biological molecules.