| Date | May 2016 | Marks available | 1 | Reference code | 16M.1.HL.TZ0.38 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Identify | Question number | 38 | Adapted from | N/A |
Question
Which process is part of the mechanism that controls muscle contraction?
A. Troponin enables actin heads to attach to ATP and slide along myosin.
B. Myosin heads attach to troponin and tropomyosin pulls on actin filaments.
C. Tropomyosin attaches to calcium and breaks the bond between actin and myosin.
D. Calcium frees actin filaments for myosin heads to attach.
Markscheme
D
Examiners report
This was one of the best discriminatory questions. Good candidates had obvious studied section 11.2 well.
