DP Biology (last assessment 2024)
Question 19M.3.HL.TZ2.a
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.HL.TZ2.a |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
19M.3.HL.TZ2.a
Biopharming is the use of genetically modified plants or animals as a source of pharmaceutical products.
Outline how a named vector is used to introduce a new gene into a plant.
[2]
Markscheme
ALTERNATIVE 1
a. Agrobacterium tumefaciens contains a tumour-inducing/Ti plasmid ✔
b. required/target gene inserted into plasmid ✔
c. bacterium injects modified plasmid into plant cell and DNA becomes incorporated into plant cell nucleus ✔
ALTERNATIVE 2
d. tobacco mosaic virus/TMV is the vector ✔
e. required/target gene inserted into TMV ✔
f. TMV injects modified DNA into plant cell «and DNA becomes incorporated into plant cell nucleus» ✔
Examiners report
Most had some knowledge about the usage of vectors to introduce genes, but their difficulty was in structuring their answer.
