DP Chemistry (last assessment 2024)

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Question 23M.3.SL.TZ1.5

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Date May 2023 Marks available [Maximum mark: 5] Reference code 23M.3.SL.TZ1.5
Level SL Paper 3 Time zone TZ1
Command term Identify, Outline, State, Suggest Question number 5 Adapted from N/A
5.
[Maximum mark: 5]
23M.3.SL.TZ1.5

Vitamins are micronutrients necessary for the correct functioning of the body.

(a)

Outline why vitamins usually need to be obtained from food sources.

[1]

Markscheme

cannot be synthesized «by the human body» ✓

(b)

The structures of three vitamins are given in section 35 of the data booklet.

(b.i)

Identify one functional group present in all three vitamins.

[1]

Markscheme

hydroxyl
OR
alkene ✓

 

Accept −OH/alcohol.

Accept C=C/carbon-carbon double bond.

(b.ii)

Identify one functional group only present in vitamin C.

[1]

Markscheme

ester/-CO-O-R ✓

 

Do not accept carbonyl.

(c.i)

State two factors, other than concentration, that must be controlled for correct metabolic functioning in the cytoplasm of a cell.

[1]

Markscheme

temperature AND pH ✓

(c.ii)

Suggest one reason why it is necessary for cells to have a high water content.

[1]

Markscheme

«aqueous environment» for chemical reactions
OR
reactants/products water-soluble ✓

 

Accept to transport ions/molecules «in/out of cell».