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

7. Enzyme Inhibition and Regulation

Enzyme Inhibition

Biochemistry

7. Enzyme Inhibition and Regulation

Enzyme Inhibition

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Multiple Choice

The synthesis of an inducible enzyme requires which of the following?

A permanently active repressor protein

The absence of all regulatory proteins

The presence of a specific inducer molecule

Constant high levels of substrate regardless of environmental conditions

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Verified step by step guidance

Understand the concept of an inducible enzyme: Inducible enzymes are enzymes whose expression is regulated by the presence or absence of specific molecules, often called inducers. These enzymes are typically involved in metabolic pathways that respond to environmental changes.

Review the role of a repressor protein: In inducible systems, a repressor protein binds to the operator region of the DNA, preventing transcription of the enzyme. The repressor is typically active unless an inducer molecule is present to deactivate it.

Examine the role of an inducer molecule: An inducer molecule binds to the repressor protein, causing a conformational change that prevents the repressor from binding to the operator. This allows RNA polymerase to transcribe the gene encoding the enzyme.

Analyze why constant high levels of substrate are not sufficient: While substrate presence may be necessary for enzyme activity, it does not directly regulate the synthesis of inducible enzymes. The synthesis is controlled by the interaction between the inducer and the repressor protein.

Conclude that the presence of a specific inducer molecule is required: The inducer molecule is essential for deactivating the repressor protein, enabling transcription and synthesis of the inducible enzyme.