DP Biology (last assessment 2024)
Question 19N.3.SL.TZ0.9c
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.SL.TZ0.9c |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Deduce | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
19N.3.SL.TZ0.9c
A study was carried out in Brazil on the transfer of pollen (cross-pollination) from transgenic strains to non-transgenic strains of soybean (Glycine max). The transgenic crop was resistant to the herbicide glyphosate. The graph below shows the percentage of cross-pollination between transgenic and non-transgenic crops in fields separated by different distances.
[Source: S Abud, et al., (2007), Gene flow from transgenic to nontransgenic soybean plants in the Cerrado region of Brazil,
Genetics and Molecular Research, 6 (2), pages 445–452]
(c)
Agrobacterium tumefaciens stains pink or red with the Gram stain. Deduce from this result what type of bacterium A. tumefaciens is.
[1]
Markscheme
«Gram» negative ✔
