How many different kinds of amino acids are used to make up proteins in the human body?

• A. 15
• B. 25
• C. 20
• D. 30

Answer: (C)

Verified step by step guidance

1. Understand that proteins are made up of building blocks called amino acids.
2. Recognize that there are 20 standard amino acids that are used to build proteins in the human body.
3. These 20 amino acids are encoded by the genetic code and are essential for protein synthesis.
4. Each amino acid has a specific side chain, which gives it unique properties and functions in proteins.
5. Remember that while there are more than 20 amino acids in nature, only these 20 are directly involved in the synthesis of proteins in humans.