MHT CET 202621 AprilEvening Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 21 April
- Shift
- Evening Shift
- Subject
- Biology
- Chapter
- Human Reproduction
MHT CET 2026 · 21 April · Evening Shift · Biology · Human Reproduction
Identify the INCORRECT statement about zona pellucida.
Identify the INCORRECT statement about zona pellucida.
Options
- AIt has fertilizin receptor proteins (ZP 3, ZP 2)
- BThe fertilizin binds to specific protein- antifertilizin of sperm.
- CIt brings about attraction of sperms to the egg to enhance fertilization.
- DIt stimulates acrosome to release Trypsin and Pepin
Correct answer
D. It stimulates acrosome to release Trypsin and Pepin
Step-by-step solution
The zona pellucida contains glycoproteins such as ZP1, ZP2, and ZP3. ZP3 acts as a primary sperm receptor and binds to specific proteins on the sperm head, which triggers the acrosome reaction.
The fertilizin-antifertilizin interaction is a species-specific reaction where fertilizin (secreted by the egg) binds to antifertilizin (present on the sperm), facilitating the attraction and agglutination of sperms to enhance fertilization.
During the acrosome reaction, the acrosome releases sperm lysins, which include hyaluronidase, corona penetrating enzyme, and acrosin (a trypsin-like enzyme). It does not release trypsin and pepsin (gastric enzymes). Therefore, the statement that it stimulates the acrosome to release trypsin and pepsin is incorrect.
Answer: It stimulates acrosome to release Trypsin and Pepin
The fertilizin-antifertilizin interaction is a species-specific reaction where fertilizin (secreted by the egg) binds to antifertilizin (present on the sperm), facilitating the attraction and agglutination of sperms to enhance fertilization.
During the acrosome reaction, the acrosome releases sperm lysins, which include hyaluronidase, corona penetrating enzyme, and acrosin (a trypsin-like enzyme). It does not release trypsin and pepsin (gastric enzymes). Therefore, the statement that it stimulates the acrosome to release trypsin and pepsin is incorrect.
Answer: It stimulates acrosome to release Trypsin and Pepin