Lesson: Chapter 1 — The Chemical Basis of Life

1.2. Proteins 1 of 12 Reset answers

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Question 1

Which elements are always present in a protein?

A Carbon, hydrogen, oxygen and phosphorus B Carbon, nitrogen and sulphur C Carbon, hydrogen and oxygen D Carbon, hydrogen, oxygen and nitrogen

The right answer is the one marked above.

Carbon (C), hydrogen (H), oxygen (O) and nitrogen (N) are always there.

Nitrogen is the one that separates a protein from a carbohydrate, which has only C, H and O. Phosphorus points to a nucleic acid instead.

Answer the question to continue.