DP Biology (last assessment 2024)

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Question 22M.2.HL.TZ2.6c

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Date May 2022 Marks available [Maximum mark: 4] Reference code 22M.2.HL.TZ2.6c
Level HL Paper 2 Time zone TZ2
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 4]
22M.2.HL.TZ2.6c
(c)

Humans rely on carbohydrates for much of their energy. Outline the process of digestion and absorption of starch in the human digestive system.

[4]

Markscheme
  1. salivary amylase breaks down starch in the mouth
    OR
    pancreatic amylase breaks down starch in small intestine;
  2. product is disaccharides / maltose;
  3. maltase digest disaccharides into monosaccharides / glucose / simple sugars;
  4. monosaccharides/glucose absorbed in the small intestine;
  5. villi increase the surface area of the intestinal epithelium for greater absorption;
  6. (monosaccharides are) absorbed by co-transport/active transport (into intestinal cell) / absorbed byfacilitated diffusion into blood (from intestinal cell);

Do not accept glucose or sugars for mpb.

Examiners report

Most candidates presented full and correct answers regarding the enzymes and molecules involved in starch digestion. The main recommendation here was to watch the accuracy of statements.

Syllabus sections