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 Configuration

Biochemistry

3. Amino Acids

Amino Acid Configuration

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Multiple Choice

Which of the following statements is true?

Life predominantly uses D-amino acids to build proteins.

Except for Ser, life predominantly uses S-amino acids to build proteins.

All L-amino acids have an S configuration.

Life almost exclusively uses L-amino acids to build proteins.

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Verified step by step guidance

Understand the concept of chirality in amino acids: Amino acids, except glycine, have a chiral center at the alpha carbon, which means they can exist in two enantiomeric forms, L and D.

Recognize the biological preference: In biological systems, proteins are almost exclusively composed of L-amino acids. This is a fundamental aspect of biochemistry.

Clarify the configuration: The L and D nomenclature is based on the molecule's similarity to the structure of L-glyceraldehyde. It is important to note that L-amino acids do not necessarily have an S configuration; the configuration depends on the specific side chain.

Evaluate the given statements: Analyze each statement based on the above concepts. The statement 'Life predominantly uses D-amino acids to build proteins' is incorrect as proteins are made from L-amino acids.

Identify the correct statement: The statement 'Life almost exclusively uses L-amino acids to build proteins' is true, aligning with the biological preference for L-amino acids in protein synthesis.