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 the primary substrate for the enzyme amylase?

Lactose

Cellulose

Sucrose

Starch

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Verified step by step guidance

Understand the role of the enzyme amylase: Amylase is a hydrolase enzyme that catalyzes the breakdown of polysaccharides into simpler sugars. Specifically, it acts on α-1,4 glycosidic bonds in polysaccharides.

Review the chemical structure of the given options: Lactose is a disaccharide composed of glucose and galactose, cellulose is a polysaccharide with β-1,4 glycosidic bonds, sucrose is a disaccharide composed of glucose and fructose, and starch is a polysaccharide composed of glucose units linked by α-1,4 glycosidic bonds.

Identify the substrate specificity of amylase: Amylase specifically targets polysaccharides with α-1,4 glycosidic bonds, which are present in starch but not in lactose, cellulose, or sucrose.

Eliminate incorrect options: Lactose and sucrose are disaccharides, which are not the primary substrates for amylase. Cellulose has β-1,4 glycosidic bonds, which amylase cannot hydrolyze.

Conclude that starch is the correct answer: Starch is the primary substrate for amylase because it contains α-1,4 glycosidic bonds that the enzyme can hydrolyze into maltose and glucose.