Digestive enzymes and their functions — KCSE Biology
KCSE Biology · 100 practice questions · 3 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Name digestive enzymes and state where they are produced
State the substrates and products of key digestive enzymes
Digestive enzymes and their functions
Sample Questions
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The process of digestion involves various substances that play crucial roles in breaking down food and facilitating nutrient absorption. Understanding the functions of these substances and their interactions within the digestive system is essential for comprehending overall metabolic health. (a) State two functions of bile juice in the digestion of food. (two marks) (b) Explain why blood from the gut must pass through the liver before joining general circulation. (2 marks)
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Name the enzyme responsible for each of the following reactions: (a) Digestion of lactose into glucose and galactose. (1 mark) (b) Conversion of proteins into peptides in the stomach. (1 mark) (c) Breakdown of hydrogen peroxide in living tissues. (1 mark)
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Enzymes play a crucial role in the biochemical processes of digestion, facilitating the breakdown of complex food substances into simpler forms. Understanding their function and interaction with substrates is essential for comprehending the overall digestive system. (a) Define the term enzyme. (2 marks) (b) Name the model that explains how enzymes interact with their substrates. (1 mark) (c) Name the part of the enzyme molecule where the substrate binds. (1 mark)
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