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

Which of the following best describes the function of protein phosphatases?

They remove phosphate groups from proteins.

They synthesize proteins from amino acids.

They add phosphate groups to proteins.

They hydrolyze peptide bonds in proteins.

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Verified step by step guidance

Understand the role of protein phosphatases: Protein phosphatases are enzymes that catalyze the removal of phosphate groups from proteins, a process known as dephosphorylation. This is crucial for regulating protein activity and signaling pathways.

Compare the function of protein phosphatases with protein kinases: Protein kinases add phosphate groups to proteins (phosphorylation), while protein phosphatases remove them. These opposing actions help maintain cellular homeostasis.

Eliminate incorrect options: 'They synthesize proteins from amino acids' refers to ribosomes and translation, not protein phosphatases. 'They add phosphate groups to proteins' describes protein kinases, not phosphatases. 'They hydrolyze peptide bonds in proteins' refers to proteases, not phosphatases.

Focus on the correct description: Protein phosphatases specifically remove phosphate groups from proteins, which can deactivate or alter the function of the protein depending on the signaling pathway.

Conclude with the correct answer: The best description of protein phosphatases is 'They remove phosphate groups from proteins.' This aligns with their biological role in dephosphorylation.