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 best describes a characteristic of NAD$^+$?

NAD$^+$ is a structural component of DNA.

NAD$^+$ directly encodes genetic information.

NAD$^+$ is a protein enzyme involved in catalysis.

NAD$^+$ acts as an electron carrier by accepting electrons during redox reactions.

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Verified step by step guidance

Step 1: Begin by understanding what NAD$^+$ (Nicotinamide Adenine Dinucleotide) is. NAD$^+$ is a coenzyme found in all living cells and plays a crucial role in metabolic processes, particularly in redox reactions.

Step 2: Clarify the role of NAD$^+$ in redox reactions. NAD$^+$ acts as an electron carrier, meaning it accepts electrons during oxidation reactions and becomes reduced to NADH. This is essential for energy production in cellular respiration.

Step 3: Eliminate incorrect options based on the properties of NAD$^+ as a coenzyme. It is not a structural component of DNA, does not encode genetic information, and is not a protein enzyme. These statements are inconsistent with the biochemical role of NAD$^+$.

Step 4: Focus on the correct statement: NAD$^+$ acts as an electron carrier by accepting electrons during redox reactions. This aligns with its biochemical function in processes like glycolysis, the citric acid cycle, and oxidative phosphorylation.

Step 5: Conclude that the correct answer is based on the fundamental role of NAD$^+$ in energy metabolism, emphasizing its importance in transferring electrons to support ATP synthesis.