Table of contents

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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 Configuration

Biochemistry

3. Amino Acids

Amino Acid Configuration

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Multiple Choice

Which of the following shows an L-amino acid?

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Understand the structure of an L-amino acid: In L-amino acids, the amino group (NH3+) is on the left when the molecule is drawn in the Fischer projection with the carboxyl group (COO-) at the top.

Identify the chiral center: The central carbon atom (alpha carbon) is bonded to four different groups: an amino group, a carboxyl group, a hydrogen atom, and a variable side chain (R group).

Determine the configuration: In the Fischer projection, if the amino group is on the left, it is an L-amino acid. If it is on the right, it is a D-amino acid.

Analyze the images: Look at each image to see the position of the NH3+ group relative to the COO- group. The correct L-amino acid will have the NH3+ group on the left in a Fischer projection.

Select the correct image: Based on the analysis, choose the image where the NH3+ group is on the left when the COO- group is at the top, indicating an L-amino acid.