Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

4. Protein Structure

Peptide Bond

Biochemistry

4. Protein Structure

Peptide Bond

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Multiple Choice

Which type of bond is responsible for linking amino acids together in a polypeptide chain?

Disulfide bond

Ionic bond

Hydrogen bond

Peptide bond

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Verified step by step guidance

Understand the structure of amino acids: Amino acids are the building blocks of proteins, and each amino acid contains an amino group (-NH₂), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain (R group) attached to a central carbon atom.

Learn how amino acids link together: Amino acids are joined through a condensation reaction (also called a dehydration synthesis reaction), where the carboxyl group (-COOH) of one amino acid reacts with the amino group (-NH₂) of another amino acid.

Recognize the bond formed: During the condensation reaction, a molecule of water (H₂O) is removed, and a covalent bond called a peptide bond is formed between the carbon atom of the carboxyl group and the nitrogen atom of the amino group.

Understand the role of peptide bonds in polypeptides: Peptide bonds link amino acids together in a linear sequence, forming a polypeptide chain, which is the primary structure of a protein.

Differentiate peptide bonds from other bonds: Disulfide bonds, ionic bonds, and hydrogen bonds are important in stabilizing the three-dimensional structure of proteins, but they do not link amino acids together in the primary sequence. Only peptide bonds are responsible for this linkage.