Give the enzyme, substrate and product for amylase, protease and lipase.
Reveal answer
Amylase: starch → maltose. Protease: protein → amino acids. Lipase: lipids → fatty acids + glycerol.
Key words: maltose · amino acids · glycerol
2(e) NUTRITION · RECALL
2.29 Digestive enzymes
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Where is each made: amylase, protease, lipase?
Reveal answer
Amylase: salivary glands, pancreas, small intestine. Protease: stomach, pancreas, small intestine. Lipase: pancreas, small intestine.
Key words: salivary glands · pancreas · stomach
What does maltase do?
Reveal answer
Breaks maltose into glucose in the small intestine.
Key words: maltose · glucose
Does protease work in the mouth?
Reveal answer
No protease is released in the mouth; protein digestion starts in the stomach.
Key words: stomach
Brief CORMMSS for pH and amylase.
Reveal answer
C: 5 pH buffers; O: same amylase; R: ×3 and mean; M1: iodine test every 30 s; M2: time to no blue-black; S1: 37 °C water bath; S2: same volumes of starch and amylase.
Key words: buffer · iodine · water bath
What is meant by the term chemical digestion?
Reveal answer
Enzyme-catalysed hydrolysis of large molecules into smaller molecules.
Key words: chemical digestion
What is meant by the term amylase?
Reveal answer
A carbohydrase that hydrolyses starch to maltose.
Key words: amylase
What is meant by the term maltase?
Reveal answer
An enzyme that hydrolyses maltose to glucose.
Key words: maltase
What is meant by the term protease?
Reveal answer
An enzyme that hydrolyses proteins or peptides.
Key words: protease
What is meant by the term lipase?
Reveal answer
An enzyme that hydrolyses lipids to fatty acids and glycerol.
Key words: lipase
Digestive enzyme map, Amylase. Substrate? Product and main site?
Reveal answer
Substrate: Starch Product and main site: Maltose; mouth and small intestine.
Key words: Amylase
Digestive enzyme map, Maltase. Substrate? Product and main site?
Reveal answer
Substrate: Maltose Product and main site: Glucose; small-intestine surface.
Key words: Maltase
Digestive enzyme map, Proteases. Substrate? Product and main site?
Reveal answer
Substrate: Proteins/peptides Product and main site: Amino acids; stomach and small intestine.
Key words: Proteases
Digestive enzyme map, Lipases. Substrate? Product and main site?
Reveal answer
Substrate: Lipids Product and main site: Fatty acids and glycerol; mainly small intestine.
Key words: Lipases
True or false, and why? “Amylase turns starch directly into glucose.”
Reveal answer
False. At this level, amylase produces maltose and maltase then produces glucose.
True or false, and why? “Protease digests protein into sugar.”
Reveal answer
False. Proteases ultimately produce amino acids.
True or false, and why? “Bile is a lipase.”
Reveal answer
False. Bile contains no digestive enzyme; it emulsifies lipid and affects pH.
True or false, and why? “Enzymes are used up in digestion.”
Reveal answer
False. They catalyse reactions and can act repeatedly.