Question 19M.3.HL.TZ2.11
| Date | May 2019 | Marks available | [Maximum mark: 5] | Reference code | 19M.3.HL.TZ2.11 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Determine, Outline | Question number | 11 | Adapted from | N/A |
A segment of DNA is shown. Determine a possible open reading frame (ORF) segment in the DNA segment by completing the table.
[2]
a. correct starting point ✔
eg
OR
b. correct RNA nucleotides ✔
Most candidates had difficulty completing the diagram and/or used DNA nucleotides instead of RNA nucleotides.
In gene research, outline the use of open reading frames.
[1]
identify a sequence/gene «that has the potential to be transcribed» ✔
Knowledge of different tools in gene research seems to be fine, but gene knockout was less understood.
In gene research, outline the use of gene knockout.
[1]
silence gene to observe the effect when the gene is not expressed
OR
change in phenotype to deduce function of gene ✔
Knowledge of different tools in gene research seems to be fine, but gene knockout was less understood.
In gene research, outline the use of BLASTn.
[1]
to compare nucleotide/DNA sequence with other «nucleotide» sequences ✔