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 is a protein catalyst that facilitates chemical reactions?

Enzyme

Substrate

Cofactor

Inhibitor

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Verified step by step guidance

Step 1: Begin by understanding the term 'protein catalyst.' A protein catalyst is a type of protein that speeds up chemical reactions without being consumed in the process. This is a key feature of enzymes.

Step 2: Review the definition of an enzyme. Enzymes are biological molecules, typically proteins, that act as catalysts to accelerate biochemical reactions. They are highly specific to the reactions they facilitate.

Step 3: Examine the other options provided: 'Substrate,' 'Cofactor,' and 'Inhibitor.' A substrate is the molecule upon which an enzyme acts, not the catalyst itself. A cofactor is a non-protein molecule that assists enzymes in their function, and an inhibitor is a molecule that decreases enzyme activity.

Step 4: Compare the definitions of all the options to identify which one matches the description of a protein catalyst. Based on the definitions, the correct answer is 'Enzyme.'

Step 5: Conclude that enzymes are the protein catalysts responsible for facilitating chemical reactions in biological systems, distinguishing them from substrates, cofactors, and inhibitors.