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 of the following best describes the role of a ligase enzyme?

It catalyzes the transfer of functional groups between molecules.

It catalyzes the oxidation-reduction reactions between molecules.

It catalyzes the joining of two molecules using energy derived from ATP hydrolysis.

It catalyzes the hydrolysis of chemical bonds.

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Verified step by step guidance

Step 1: Begin by understanding the role of ligase enzymes. Ligases are a class of enzymes that catalyze the joining (ligation) of two molecules, typically requiring energy input from ATP hydrolysis.

Step 2: Compare the given options to the definition of ligase enzymes. Eliminate options that do not align with the function of ligases. For example, transferring functional groups or catalyzing oxidation-reduction reactions are roles of transferases and oxidoreductases, respectively.

Step 3: Focus on the correct description of ligase activity. Ligases facilitate the formation of new chemical bonds between molecules, often coupling this process with the hydrolysis of ATP to provide the necessary energy.

Step 4: Evaluate the remaining options. The correct answer should explicitly mention the joining of two molecules and the involvement of ATP hydrolysis, which is characteristic of ligase enzymes.

Step 5: Confirm your understanding by recalling examples of ligase enzymes, such as DNA ligase, which joins DNA strands during replication and repair, using ATP as an energy source.