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Date November 2019 Marks available 2 Reference code 19N.3.sl.TZ0.10
Level SL Paper 3 Time zone TZ0
Command term Explain Question number 10 Adapted from N/A

Question

Vitamins are organic compounds essential in small amounts.

State the name of one functional group common to all three vitamins shown in section 35 of the data booklet.

[1]
a.

Explain the biomagnification of the pesticide DDT.

[2]
b.

Explain why maltose, C12H22O11, is soluble in water.

[2]
c.

Markscheme

hydroxyl ✔

NOTE: Accept “hydroxy” but not “hydroxide”.
Accept “alkenyl”.
Do not accept formula.

a.

accumulates in fat/tissues/living organisms
OR
cannot be metabolized/does not break down «in living organisms»
OR
not excreted / excreted «very» slowly ✔

passes «unchanged» up the food chain
OR
increased concentration as one species feeds on another «up the food chain» ✔

NOTE: Accept “lipids” for “fat”.

b.

«solubility depends on forming many» H-bonds with water ✔
maltose has many hydroxyl/OH/oxygen atom/O «and forms many H-bonds» ✔

NOTE: Reference to “with water” required.
Accept “hydroxy” for “hydroxyl” but not “hydroxide/OH”.
Reference to many/several OH groups/O atoms required for M2.

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Options » B: Biochemistry » B.6 Biochemistry and the environment
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