DP Chemistry (last assessment 2024)

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Question 18N.3.hl.TZ0.c.ii

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.hl.TZ0.c.ii
Level hl Paper 3 Time zone TZ0
Command term Outline Question number c.ii Adapted from N/A
c.ii.
[Maximum mark: 2]
18N.3.hl.TZ0.c.ii

Lactose, found in milk and dairy products, is a disaccharide formed from two different monosaccharides. The structure of lactose is shown with numbered carbon atoms.

Starch and cellulose are both formed from glucose and have similar structures.

Outline why cellulose is an essential part of human diet.

[2]

Markscheme

Any two of:

helps food pass through intestine

OR

adds bulk/dietary fibre ✔

 

reduces appetite

OR

helps prevent obesity ✔

 

prevents constipation

OR

reduces risk of hemorrhoids/diverticulosis/Crohn’s disease/irritable bowel syndrome/bowel cancer ✔

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