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 is NOT attached to the central (alpha) carbon atom in a standard amino acid?

A carboxyl group ($-COOH$)

A phosphate group ($-PO_4^{3-}$)

A hydrogen atom ($-H$)

An amino group ($-NH_2$)

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Verified step by step guidance

Step 1: Begin by recalling the general structure of a standard amino acid. Amino acids are the building blocks of proteins and share a common structure consisting of a central (alpha) carbon atom.

Step 2: Identify the four groups typically attached to the alpha carbon in a standard amino acid. These include: (1) a carboxyl group ($-COOH$), (2) an amino group ($-NH_2$), (3) a hydrogen atom ($-H$), and (4) a variable side chain (R group).

Step 3: Examine the options provided in the question. Compare each group listed to the standard structure of an amino acid to determine which one is not typically attached to the alpha carbon.

Step 4: Note that a phosphate group ($-PO_4^{3-}$) is not part of the standard structure of an amino acid. Phosphate groups are commonly found in nucleotides and other biomolecules, but they are not attached to the alpha carbon in amino acids.

Step 5: Conclude that the correct answer is the phosphate group ($-PO_4^{3-}$), as it is not one of the four groups attached to the alpha carbon in a standard amino acid.