| Date | November 2009 | Marks available | 3 | Reference code | 09N.3.SL.TZ0.17 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Outline | Question number | 17 | Adapted from | N/A |
Question
The electron micrograph below shows a pathogen.
Identify the type of pathogen shown in the electron micrograph, giving reasons for your answer.
[2]
a.
Outline the use of viral vectors in gene therapy.
[3]
b.
Markscheme
virus;
protein coat;
RNA/riboprotein;
a.
removal of white blood cells / bone marrow cells;
using a vector; insert gene into chromosome;
cells are replaced in the body of the patient;
the normal gene can be expressed;
e.g. SCID where the replaced gene allows for the production of ADA/Adenosine deaminase;
b.
Examiners report
Candidates could successfully state which pathogen was shown, but few gave correct reasons.
a.
Candidates either answered this correctly or did not answer it at all.
b.
Syllabus sections
Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Additional higher level topics) » B.4 Medicine
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