National 5 Biology Unit 1 Proteins and Enzymes Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

National 5 Biology Unit 1 Proteins and Enzymes Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What type of bond links amino acids together in proteins? Peptide bonds What determines the shape and function of a protein? The sequence of amino acids What happens to an enzyme when it is denatured? Its active site changes shape and it no longer works What name is given to the part of the enzyme where the substrate fits? Active site What is meant by enzyme specificity? Each enzyme works with only one substrate 2 What effect does high temperature have on enzyme activity? It can denature the enzyme and stop its activity What is the optimum temperature for most human enzymes? Around 37°C What happens to the rate of an enzyme reaction if the temperature is too low? It slows down because particles move less What happens to enzymes at very high temperatures? They become denatured What is the result of a synthesis reaction catalysed by an enzyme? A larger molecule is made from smaller molecules What is the result of a degradation reaction catalysed by an enzyme? A larger molecule is broken down into smaller molecules 3 What is the enzyme that breaks down hydrogen peroxide? Catalase What are the products of the catalase reaction? Water and oxygen What enzyme breaks down starch? Amylase What is the product of the amylase reaction? Maltose What enzyme breaks down proteins? Pepsin What are the products of the pepsin reaction? Amino acids