Biology · 2006 · November · Paper 2 · HL · Question paper
BiologyQuestion paper2006HLNovember
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This question paper is listed under Biology in the 2006 examination archive. Its catalogue level is HL. The catalogue session is November. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.
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8806-6002 9 pages
N06/4/BIOLO/HP2/ENG/TZ0/XX
Thursday 16 November 2006 (afternoon)
biology
HigHER lEvEl
PaPER 2
IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI
INSTRUCTIONS TO CANDIDATES
• Write your session number in the boxes above.
• Do not open this examination paper until instructed to do so.
• Section A: answer all of Section A in the spaces provided.
• Section B: answer two questions from Section B. Write your answers on answer sheets. Write
your session number on each answer sheet, and attach them to this examination
paper and your cover sheet using the tag provided.
• At the end of the examination, indicate the numbers of the questions answered in the candidate box
on your cover sheet and indicate the number of sheets used in the appropriate box on your cover
sheet.
2 hours 15 minutes
[Personal identifier removed]
0109
88066002
8806-6002
– 2 – N06/4/BIOLO/HP2/ENG/TZ0/XX
SEction a
Answer all the questions in the spaces provided.
1. Plants native to warm climates sometimes suffer injuries when exposed to relatively low
temperatures. For example, temperatures in the range of 10 °C to 15 °C can cause “chilling
injuries” to some sub-tropical plants that normally grow between 20 °C and 25 °C. These
“chilling injuries” may affect gene expression and reduce the rates of photosynthesis and
protein synthesis. Some plants are more resistant to “chilling injuries” than others.
These injuries could be due to damaged membranes. Membrane lipids consist of a mixture of
saturated fatty acids (no double bonds) and unsaturated fatty acids (one or more double bonds).
Saturated fatty acids have a higher melting point than unsaturated fatty acids.
The table below shows the main fatty acid composition (as a percentage of the total fatty acid
content) of mitochondrial membranes in various plants and the ratio of unsaturated/saturated
fatty acids.
Fatty acid composition / %
chill-resistant plants chill-sensitive plants
Fatty acid Number of
double bonds Cauliflower Turnip Pea Bean Sweet
potato Maize
Palmitic 0 21.3 19.0 12.8 24.0 24.9 28.3
Stearic 0 1.9 1.1 2.9 2.2 2.6 1.6
Oleic 1 7.0 12.2 3.1 3.8 0.6 4.6
Linoleic 2 16.4 20.6 61.9
File information
Subject
Biology
Document type
Question paper
Year
2006
Session
November
Level
HL
Paper
2
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
249 KB
Pages
9
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