Questions: Name the type of bond that holds amino acids together in a protein molecule. Peptide bond Hydrogen bond Ionic bond Phosphodiester bond

The answer is the first one: Peptide bond.

Explanation for each option:

• Peptide bond: This is the correct answer. Peptide bonds are the covalent chemical bonds that link amino acids together in a protein. They form between the carboxyl group of one amino acid and the amino group of another, releasing a molecule of water in the process.

• Hydrogen bond: This is incorrect in this context. Hydrogen bonds are weak interactions that can occur between molecules or within different parts of a single molecule, such as in the secondary structure of proteins (e.g., alpha helices and beta sheets), but they do not link amino acids together.

• Ionic bond: This is incorrect. Ionic bonds occur between oppositely charged ions, which is not the primary type of bond that links amino acids in proteins.

• Phosphodiester bond: This is incorrect. Phosphodiester bonds are found in nucleic acids, such as DNA and RNA, linking nucleotides together, not in proteins.

In summary, the type of bond that holds amino acids together in a protein molecule is a peptide bond.