A.
B.
C.
D.
参考答案:
A
本题详细解析:
Arrow A is pointing to the acrosome, which is found at the front of the sperm head. The acrosome contains enzymes that break down the zona pellucida around the egg. Choice A is correct.
Choice B is pointing to the mid-piece, the site of the mitochondria which produce ATP to power the movement of the cell. Choice C is pointing to the nucleus, which contains the genetic information. Choice D is pointing to the tail of the sperm cell which propells the cell forward.
