| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.HL.TZ2.40 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Outline | Question number | 40 | Adapted from | N/A |
Question
Which event takes place during normal fertilization?
A. The acrosome fuses with the egg membrane.
B. The entire sperm cell enters the egg cytoplasm.
C. The egg divides to form a blastocyst.
D. The cortical granules fuse with the egg membrane.
Markscheme
D
Examiners report
The acrosome reaction is in the guide in section 11.4.9 so candidates should have known that it is the cortical granules and not the acrosome that fuse with the membrane.
