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

How many ionizable groups are present in the peptide Leucine-Valine-Aspartate-Tryptophan-Lysine?

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Verified step by step guidance

Step 1: Understand the concept of ionizable groups. Ionizable groups in peptides are functional groups that can gain or lose protons depending on the pH. Common ionizable groups include the amino group (N-terminus), carboxyl group (C-terminus), and side chains of certain amino acids such as Aspartate, Glutamate, Lysine, Arginine, Histidine, Tyrosine, and Cysteine.

Step 2: Identify the ionizable groups in the peptide sequence. The peptide Leucine-Valine-Aspartate-Tryptophan-Lysine has the following amino acids: Leucine, Valine, Aspartate, Tryptophan, and Lysine. Check the side chains of each amino acid to determine if they are ionizable.

Step 3: Analyze the N-terminus and C-terminus. The N-terminus (amino group) of the peptide is ionizable, and the C-terminus (carboxyl group) is also ionizable. These are always present in peptides.

Step 4: Examine the side chains of the amino acids. Aspartate has a carboxyl group in its side chain that is ionizable. Lysine has an amino group in its side chain that is ionizable. Tryptophan, Leucine, and Valine do not have ionizable side chains.

Step 5: Count the total number of ionizable groups. Add the ionizable groups from the N-terminus, C-terminus, and the side chains of Aspartate and Lysine. This will give the total number of ionizable groups in the peptide.