Dental Admissions Test (DAT) Practice Test

During human fertilization, sperm cells bind to the zona pellucida, which is a thick membrane that surrounds the egg. This is the only correct answer out of the options provided because the zona pellucida serves as a protective barrier for the egg and allows only one sperm to enter and fertilize it.

Option B, the blastocyst, is incorrect because this is the term used to describe the fertilized egg after it has divided into many cells and is ready to implant into the uterus.

Option C, the endometrium, is incorrect because this is the lining of the uterus where the fertilized egg will eventually implant and grow into a fetus.

Option D, the corpus luteum, is incorrect because this is a structure that forms in the ovary after the egg has been released during ovulation and is responsible for producing hormones to support pregnancy.

Only option A, the zona pellucida, is the correct answer for where sperm cells actually bind to the egg during human fertilization.