What type of bond joins amino acids into proteins?

• A. Peptide bond
• B. Ionic bond
• C. Hydrogen bond
• D. Covalent bond

Answer: (A)

Verified step by step guidance

1. Understand that proteins are made up of amino acids linked together in a chain.
2. Recognize that the bond formed between amino acids is a specific type of covalent bond.
3. Learn that this bond is called a peptide bond, which is formed during a dehydration synthesis reaction.
4. In a dehydration synthesis reaction, the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water.
5. The resulting bond, the peptide bond, is a strong covalent bond that links the amino acids together in a protein chain.