DP Biology (last assessment 2024)

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Question 19M.3.SL.TZ2.c

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.SL.TZ2.c
Level SL Paper 3 Time zone TZ2
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.3.SL.TZ2.c

The diagram shows a method of production of transgenic plants and some of their uses.

[Source: Jian Yao, et al., (2015), International Journal of Molecular Science, 2015, 16(12),
28549–28565; https://doi.org/10.3390/ijms161226122]

Another method of plant transformation can be used to produce the hepatitis B vaccine. Outline the production of hepatitis B vaccine in tobacco plants.

[2]

Markscheme

a. tobacco mosaic virus/TMV modified to carry gene of hepatitis B «surface antigen/HBsAg» ✔

b.«tobacco mosaic» virus infects tobacco plants 
OR 
its genetic material is incorporated into plant cells ✔

c. tobacco plants produce hepatitis B antigen ✔

d. «antigen» induces formation of antibodies/immune response «in humans» ✔

Examiners report

Parts (a) and (c) proved difficult due to lack of specific vocabulary.

Syllabus sections