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Biology · 2011 · November · Paper 2 · HL · Question paper

BiologyQuestion paper2011HLNovember

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This question paper is listed under Biology in the 2011 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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20 pages N11/4/BIOLO/HP2/ENG/TZ0/XX Wednesday 16 November 2011 (afternoon) BIOLOGY HIGHER LEVEL PAPER 2 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 questions. • Section B: answer two questions. • Write your answers in the boxes provided. 2 hours 15 minutes [Personal identifier removed] © International Baccalaureate Organization 2011 Examination code 8 8 1 1 – 6 0 0 2 0 1 2 0 8 8 1 1 6 0 02 – 2 – N11/4/BIOLO/HP2/ENG/TZ0/XX SECTION A Answer all questions. Write your answers in the boxes provided. 1. Stem cells in the bone marrow can be forced into blood vessels in a process called mobilization. Mobilization of stem cells from the bone marrow into the blood vessels represents the basis for modern bone marrow transplantation procedures. To test the effect of light on the mobilization of stem cells, mice were subjected to a simulated “jet lag” by advancing the light-dark cycle by 12 hours. This was done by subjecting mice to a 24-hour light period before the results shown in the graph were recorded. The results were compared to the stem cells in control mice under normal conditions of 12 hours of light ( ) and 12 hours of darkness ( ). Key: Control Jet lag Stem cells per ml blood 100 80 60 40 20 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 Control Jet lag Time / hours Nature by Nature Publishing Group. Reproduced with permission of Nature Publishing Group in the format Journal via Copyright Clearance Center. ( a) (i) State the maximum number of stem cells per ml blood in the control mice. [1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ( ii) Determine the number of hours of light needed to release the maximum number of stem cells in blood in control mice. [1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (This question continues on the following page) 0 2 2 0
File information
Subject
Biology
Document type
Question paper
Year
2011
Session
November
Level
HL
Paper
2
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
2.1 MB
Pages
20
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