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

6. Enzymes and Enzyme Kinetics

Enzymes

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzymes

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Multiple Choice

Protein phosphorylation is commonly involved with all of the following except:

Regulation of enzyme activity

Protein degradation by proteasomes

Cell cycle control

Signal transduction pathways

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Verified step by step guidance

Step 1: Understand the concept of protein phosphorylation. Protein phosphorylation is a biochemical process where a phosphate group is added to a protein, typically on serine, threonine, or tyrosine residues. This modification can alter the protein's function, activity, or interactions.

Step 2: Review the roles of protein phosphorylation. Protein phosphorylation is commonly involved in regulating enzyme activity, controlling the cell cycle, and mediating signal transduction pathways. These processes rely on reversible phosphorylation to modulate cellular functions dynamically.

Step 3: Examine the exception provided in the question: 'Protein degradation by proteasomes.' Proteasomes are protein complexes responsible for degrading unneeded or damaged proteins, typically marked by ubiquitination, not phosphorylation. Phosphorylation does not directly play a role in protein degradation by proteasomes.

Step 4: Compare the listed options. Protein phosphorylation is integral to regulation of enzyme activity, cell cycle control, and signal transduction pathways, but it is not directly involved in protein degradation by proteasomes.

Step 5: Conclude that the correct answer is 'Protein degradation by proteasomes,' as it is the exception to the common roles of protein phosphorylation.