Domanda del libro di testo
The enzyme sucrase catalyzes the hydrolysis of the disaccharide sucrose but not the disaccharide lactose. Does the induced-fit or lock-and-key model explain the action of sucrase better? Explain.
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Ch.10 Proteins Workers of the Cell
Frost4th EditionGeneral, Organic and Biological ChemistryISBN: 9780134988696
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TOC.tableOfContents
- Ch.4 Introduction to Organic Compounds75
- Ch.5 Chemical Reactions19
- Ch.6 Carbohydrates Life's Sweet Molecules62
- Ch.7 States of Matter and Their Attractive Forces8
- Ch.8 Solution Chemistry Sugar and Water Do Mix4
- Ch.10 Proteins Workers of the Cell89
- Ch.11 Nucleic Acids Big Molecules with a Big Role69
- Ch.12 Food as Fuel An Overview of Metabolism65
Frost4th EditionGeneral, Organic and Biological ChemistryISBN: 9780134988696Non è quello che usi tu?Cambia libro di testo
Capitolo 6, Problema 91b
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
Guida verificata passo dopo passo1
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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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.
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Percorso guidato
2:14
Intro to Enzymes Concept 1
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.
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2:39Intro to Cofactors Concept 1
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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1:02Coenzyme A Concept 4
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What type of interactions between an enzyme and its substrate help to stabilize ES?
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A substrate is held in the active site of an enzyme by attractive forces between the substrate and the amino acid side chains. For the outlined regions A, B, and C on the following substrate molecule:
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The enzyme trypsin catalyzes the breakdown of many structurally diverse proteins in foods. Does the induced-fit or lock-and-key model explain the action of trypsin better? Explain.
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If each of the following amino acid side chains is present in the active site of an enzyme, indicate whether it would (a) serve a catalytic function, (b) serve to hold the substrate, or (c) both.
a. aspartate
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Domanda del libro di testo
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?
c. contains vitamin B6 in its active site
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