重要！❤️中三Bio 大考 消化系統難題 (a) (ii) Explain the differences in the results of Tube A and Tube B. (3 marks) (a) (iii) Explain the result of Tube C. (2 marks) (b) Based on the result of the above experiment and your biological knowledge, predict how the digestion of lipids would be affected if a person has high-fat meals after his gall bladder is removed. (3 marks) 入group 下載全部題目答案！
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朗林生物
2024 HKDSE 5** 達標率 87%
中三Bio大考
消化系統難題精解
專為HKDSE而設的高頻考題拆解 + 膽囊切除後脂質消化影響
陳同學 (中三)
“消化系統由原本只識得背書，變成真正明白enzyme作用機制，校內測驗由C升到A。”
林同學 (中三)
“Don Sir的題解超清晰！特別係gall bladder removal題，考試原題幾乎一樣，穩5**。”
黃同學 (中三)
“Miss Maggie 講bile salt作用好生動，現在我終於明白lipid digestion的全過程。”
消化系統高頻難題精解（5題）
Q1.
Explain the differences in the results of Tube A and Tube B. (3 marks)
Explain the differences in the results of Tube A and Tube B. (3 marks)
Tube A (with bile salts) showed faster lipid digestion than Tube B (without bile salts).
Bile salts emulsify large fat droplets into smaller ones, increasing surface area for lipase action.
Therefore, more fatty acids were released in Tube A, leading to a greater drop in pH.
Bile salts emulsify large fat droplets into smaller ones, increasing surface area for lipase action.
Therefore, more fatty acids were released in Tube A, leading to a greater drop in pH.
Q2.
Explain the result of Tube C. (2 marks)
Explain the result of Tube C. (2 marks)
Tube C contained boiled lipase. The enzyme was denatured by high temperature, losing its specific active site.
Therefore, no lipid digestion occurred and pH remained unchanged.
Therefore, no lipid digestion occurred and pH remained unchanged.
Q3.
Predict how lipid digestion would be affected if a person has high-fat meals after gallbladder removal. (3 marks)
Predict how lipid digestion would be affected if a person has high-fat meals after gallbladder removal. (3 marks)
Without the gallbladder, bile cannot be stored and released in large amounts when needed.
This leads to insufficient emulsification of fats. Lipid digestion and absorption will be significantly reduced,
causing symptoms like steatorrhea and fat-soluble vitamin deficiency.
This leads to insufficient emulsification of fats. Lipid digestion and absorption will be significantly reduced,
causing symptoms like steatorrhea and fat-soluble vitamin deficiency.
Q4.
What is the role of bile in lipid digestion?
What is the role of bile in lipid digestion?
Bile contains bile salts that act as emulsifiers. They break large fat globules into tiny droplets,
greatly increasing the surface area for pancreatic lipase to work on.
greatly increasing the surface area for pancreatic lipase to work on.
Q5.
Why is pH used as an indicator in lipid digestion experiments?
Why is pH used as an indicator in lipid digestion experiments?
Lipid digestion produces fatty acids which lower the pH of the solution.
Monitoring pH change allows us to measure the rate of digestion quantitatively.
Monitoring pH change allows us to measure the rate of digestion quantitatively.
English Version
Q1. Tube A showed faster digestion because bile salts emulsify fats, increasing surface area for lipase activity.
Q3. Removal of gallbladder leads to inadequate bile release, resulting in poor emulsification and reduced lipid absorption after high-fat meals.
#HKDSEBiology
#消化系統
#LipidDigestion
#BileSalts
#GallbladderRemoval
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