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 forms the backbone of all protein molecules?

Disulfide bond

Hydrogen bond

Peptide bond

Ionic bond

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Verified step by step guidance

Step 1: Understand the structure of proteins. Proteins are composed of amino acids linked together in a chain. The bond that connects these amino acids is crucial to forming the backbone of the protein molecule.

Step 2: Recall the type of bond that links amino acids. Amino acids are joined by peptide bonds, which are covalent bonds formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid.

Step 3: Learn how peptide bonds are formed. Peptide bonds are created through a dehydration synthesis reaction, where a molecule of water is removed as the carboxyl group and amino group react.

Step 4: Compare peptide bonds to other types of bonds mentioned in the problem. Disulfide bonds, hydrogen bonds, and ionic bonds are important in protein structure but do not form the backbone. Disulfide bonds stabilize tertiary structure, hydrogen bonds contribute to secondary structure, and ionic bonds help stabilize interactions between charged side chains.

Step 5: Conclude that peptide bonds are the correct answer because they form the primary structure and backbone of all protein molecules.