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 is an enzyme required for the process of rephosphorylation of ADP to ATP during cellular respiration?

Lactate dehydrogenase

ATP synthase

Pepsin

Hexokinase

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Verified step by step guidance

Understand the process of rephosphorylation of ADP to ATP: This is a critical step in cellular respiration where ADP (adenosine diphosphate) is converted back to ATP (adenosine triphosphate) by adding a phosphate group. This process is essential for energy storage in cells.

Identify the enzyme responsible for ATP synthesis: The enzyme that catalyzes the rephosphorylation of ADP to ATP is ATP synthase. This enzyme is located in the inner mitochondrial membrane and plays a key role in oxidative phosphorylation.

Eliminate incorrect options: Lactate dehydrogenase is involved in anaerobic glycolysis, converting pyruvate to lactate. Pepsin is a digestive enzyme that breaks down proteins in the stomach. Hexokinase catalyzes the phosphorylation of glucose to glucose-6-phosphate in glycolysis. None of these enzymes are involved in ATP synthesis.

Focus on ATP synthase: ATP synthase uses the proton gradient generated by the electron transport chain in the mitochondria to drive the synthesis of ATP from ADP and inorganic phosphate (Pi). This process is powered by the flow of protons (H⁺) through the enzyme.

Conclude that ATP synthase is the correct answer: Based on its role in cellular respiration and the rephosphorylation of ADP to ATP, ATP synthase is the enzyme required for this process.