| Date | November 2017 | Marks available | 1 | Reference code | 17N.1.SL.tz0.3 |
| Level | Standard Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | What | Question number | 3 | Adapted from | N/A |
Question
What is the structure labelled X on the sarcomere in the diagram below?
[Source: © International Baccalaureate Organization 2017]
A. Z line
B. Myofibril
C. Myosin filament
D. Actin filament
Markscheme
C
Examiners report
The 3rd most difficult question on the paper. This question had a good discrimination index with A, B, and C as evenly strong distractors. This was also surprising given that students had been exposed to this area and performed well in the past.
Syllabus sections
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22M.2.SL.tz0.3c:
The diagram shows skeletal muscle.
[Source: HENNING DALHOFF/SCIENCE PHOTO LIBRARY.]
Identify the parts labelled A and B.
A:
B:
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19N.2.HL:.tz0.3b.i:
The diagram shows a skeletal muscle.
[Source: adapted from sportsinjuryclinic.net]
Identify the structures X and Y in the diagram.
X:
Y:
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19N.1.HL:.tz0.2:
The diagram shows a sarcomere. What are the structures labelled X?
[Source: used with permission of Wiley & Sons – Books, adapted from Principles of anatomy and physiology,
by Tortora, Gerard J., Grabowski, Sandra Reynolds, 2003, permission conveyed through Copyright Clearance Center, Inc.]A. Myofibril
B. Endomysium
C. Actin
D. Myosin
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16N.2.SL.tz0.5a:
Outline the structural components of skeletal muscle.
