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

6. Enzymes and Enzyme Kinetics

Enzymes

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzymes

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Multiple Choice

Which type of reaction is catalyzed by DNA ligase?

Hydrolysis of peptide bonds in proteins

Unwinding of the DNA double helix

Addition of methyl groups to DNA bases

Formation of phosphodiester bonds between DNA fragments

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Verified step by step guidance

Understand the role of DNA ligase: DNA ligase is an enzyme that plays a critical role in DNA replication and repair by joining DNA fragments together.

Identify the type of bond formed: DNA ligase catalyzes the formation of phosphodiester bonds, which are covalent bonds between the phosphate group of one nucleotide and the hydroxyl group of another nucleotide.

Clarify the context of DNA fragments: During processes like DNA replication, Okazaki fragments are generated on the lagging strand. DNA ligase is responsible for sealing these fragments into a continuous strand by forming phosphodiester bonds.

Compare the given options: Hydrolysis of peptide bonds in proteins is catalyzed by proteases, unwinding of the DNA double helix is performed by helicases, and addition of methyl groups to DNA bases is carried out by methyltransferases. None of these are functions of DNA ligase.

Conclude the correct answer: DNA ligase specifically catalyzes the formation of phosphodiester bonds between DNA fragments, making it the correct answer.