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

3. Amino Acids

Amino Acid Groups

Biochemistry

3. Amino Acids

Amino Acid Groups

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Multiple Choice

Which of the following functions requires thiamin (vitamin B$_1$) as a coenzyme?

Transamination of amino acids

Carboxylation of acetyl-CoA to malonyl-CoA

Oxidative decarboxylation of pyruvate to acetyl-CoA

Hydroxylation of proline residues in collagen

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Verified step by step guidance

Step 1: Understand the role of thiamin (vitamin B₁) as a coenzyme. Thiamin is a precursor for thiamin pyrophosphate (TPP), which is an essential coenzyme in enzymatic reactions involving oxidative decarboxylation of alpha-keto acids.

Step 2: Analyze the given options. Transamination of amino acids involves the transfer of amino groups and does not require thiamin as a coenzyme. Instead, it typically involves pyridoxal phosphate (vitamin B₆).

Step 3: Consider the carboxylation of acetyl-CoA to malonyl-CoA. This reaction is catalyzed by acetyl-CoA carboxylase and requires biotin as a coenzyme, not thiamin.

Step 4: Evaluate the oxidative decarboxylation of pyruvate to acetyl-CoA. This reaction is catalyzed by the pyruvate dehydrogenase complex, which requires thiamin pyrophosphate (TPP) as a coenzyme for the decarboxylation step.

Step 5: Examine the hydroxylation of proline residues in collagen. This reaction is catalyzed by prolyl hydroxylase and requires vitamin C (ascorbic acid) as a cofactor, not thiamin.