Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

19. Enzymes

Enzyme Classification

GOB Chemistry

19. Enzymes

Enzyme Classification

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3:12 minutes

Problem 91b

Textbook Question

Does each of the following statements describe a simple enzyme (no cofactor or coenzyme necessary), an enzyme that requires a cofactor, or an enzyme that requires a coenzyme?
b. consists of one polypeptide chain in its active form

Verified step by step guidance

Understand the definitions: A simple enzyme consists only of a protein (polypeptide chain) and does not require any additional molecules like cofactors or coenzymes for its activity. An enzyme requiring a cofactor needs a non-protein molecule (often a metal ion) to function. An enzyme requiring a coenzyme needs an organic molecule (often derived from vitamins) to assist in its activity.

Analyze the statement: The problem states that the enzyme consists of one polypeptide chain in its active form. This suggests that the enzyme is functional without requiring additional molecules.

Relate the statement to the definitions: Since the enzyme is active with just its polypeptide chain, it matches the description of a simple enzyme, which does not require cofactors or coenzymes.

Confirm the reasoning: A simple enzyme is characterized by its ability to function independently of cofactors or coenzymes. The statement aligns with this definition.

Conclude: Based on the analysis, the enzyme described in the statement is a simple enzyme.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Simple Enzyme

A simple enzyme is a protein that functions as a catalyst in biochemical reactions without the need for any additional non-protein molecules, such as cofactors or coenzymes. These enzymes are typically composed solely of polypeptide chains and can catalyze reactions independently. An example of a simple enzyme is lysozyme, which breaks down bacterial cell walls.

Cofactor

A cofactor is a non-protein chemical compound that is required for the biological activity of an enzyme. Cofactors can be metal ions, such as zinc or magnesium, or small organic molecules that assist in enzyme function. They often help stabilize enzyme structure or participate in the catalytic process, making them essential for the enzyme's activity.

Coenzyme

A coenzyme is a specific type of cofactor that is an organic molecule, often derived from vitamins, which assists enzymes in catalyzing reactions. Coenzymes typically bind to the enzyme temporarily and are involved in the transfer of chemical groups during the reaction. Examples include NAD+ and coenzyme A, which play crucial roles in metabolic pathways.

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