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

Did the enzymes from Claire's small intestine break down the protein at a low pH, and why?

No, because small intestinal enzymes function optimally at a neutral to slightly basic pH.

Yes, because all digestive enzymes are most active at low pH.

No, because proteins are not digested in the small intestine.

Yes, because the small intestine is highly acidic.

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Verified step by step guidance

Step 1: Understand the role of enzymes in protein digestion. Proteins are broken down into smaller peptides and amino acids by enzymes such as pepsin in the stomach and proteases in the small intestine. Each enzyme has an optimal pH range for activity.

Step 2: Recall the pH environment of the small intestine. The small intestine has a neutral to slightly basic pH (approximately 7.4 to 8.0), which is maintained by bicarbonate secreted by the pancreas to neutralize stomach acid.

Step 3: Identify the enzymes active in the small intestine. Enzymes like trypsin and chymotrypsin, secreted by the pancreas, are responsible for protein digestion in the small intestine. These enzymes function optimally at the neutral to slightly basic pH of the small intestine.

Step 4: Evaluate the statement 'Did the enzymes from Claire's small intestine break down the protein at a low pH?' Small intestinal enzymes do not function optimally at low pH; they require a neutral to slightly basic environment for activity.

Step 5: Analyze the provided answer choices. Based on the physiological pH of the small intestine and the optimal pH range of its enzymes, the correct answer is: 'No, because small intestinal enzymes function optimally at a neutral to slightly basic pH.'