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

1. Introduction to Biochemistry

Nucleic Acids

Biochemistry

1. Introduction to Biochemistry

Nucleic Acids

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Multiple Choice

Which of the following statements regarding NADPH and NADH is true?

NADPH is primarily involved in anabolic reactions, while NADH is mainly involved in catabolic reactions.

NADPH and NADH have identical roles in cellular metabolism.

NADH is the main reducing agent in biosynthetic pathways.

Both NADPH and NADH are used exclusively in the electron transport chain.

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Verified step by step guidance

Step 1: Begin by understanding the roles of NADPH and NADH in cellular metabolism. NADPH is primarily involved in anabolic reactions, which are biosynthetic processes that build complex molecules, such as fatty acids and nucleotides. NADH, on the other hand, is mainly involved in catabolic reactions, which break down molecules to release energy.

Step 2: Analyze the first statement: 'NADPH is primarily involved in anabolic reactions, while NADH is mainly involved in catabolic reactions.' This aligns with the known roles of NADPH and NADH in metabolism, as described in Step 1.

Step 3: Evaluate the second statement: 'NADPH and NADH have identical roles in cellular metabolism.' This is incorrect because NADPH and NADH have distinct roles; NADPH is used in biosynthetic pathways, while NADH is used in energy production processes such as the electron transport chain.

Step 4: Assess the third statement: 'NADH is the main reducing agent in biosynthetic pathways.' This is incorrect because NADPH, not NADH, is the primary reducing agent in biosynthetic (anabolic) pathways.

Step 5: Examine the fourth statement: 'Both NADPH and NADH are used exclusively in the electron transport chain.' This is incorrect because NADPH is not primarily used in the electron transport chain; it is involved in anabolic reactions, whereas NADH is used in the electron transport chain during energy production.