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 enzymes is least likely to be functional within a mammalian organism?

Hexokinase

Cellulase

DNA polymerase

Pepsin

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Verified step by step guidance

Step 1: Understand the function of each enzyme listed. Hexokinase is involved in glycolysis, catalyzing the phosphorylation of glucose to glucose-6-phosphate. DNA polymerase is essential for DNA replication and repair. Pepsin is a digestive enzyme that breaks down proteins in the stomach. Cellulase, on the other hand, breaks down cellulose, a component of plant cell walls.

Step 2: Consider the physiological environment of a mammalian organism. Mammals do not produce cellulose as part of their diet, and their digestive systems are not adapted to break down cellulose efficiently. This is why cellulase is not naturally produced in mammals.

Step 3: Evaluate the presence of these enzymes in mammalian systems. Hexokinase, DNA polymerase, and pepsin are all naturally occurring and functional enzymes in mammals, as they play critical roles in metabolism, genetic processes, and digestion, respectively.

Step 4: Analyze why cellulase is least likely to be functional. Mammals lack the genetic coding to produce cellulase, and their digestive systems do not have the necessary conditions (such as symbiotic microorganisms) to utilize cellulase effectively.

Step 5: Conclude that cellulase is the enzyme least likely to be functional within a mammalian organism, as it is not naturally produced or required for mammalian physiology.