Question:
Fertilizin receptor proteins necessary for attraction of sperms to the egg in mammals are present on ---------.
Fertilizin receptor proteins necessary for attraction of sperms to the egg in mammals are present on ---------.
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Sperm-binding receptor glycoproteins sit on the glycoprotein coat that directly surrounds the mammalian ovum.
Updated On: Nov 12, 2026
- vitelline membrane
- corona radiata
- zona pellucida
- perivitelline space
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The mammalian egg is covered by a thick glycoprotein layer called the zona pellucida. Cells of the corona radiata lie outside it.
Step 2: Role of Fertilizin
Fertilizin is the sperm-receptor glycoprotein of the egg (ZP3 in mammals). It binds antifertilizin on the sperm head, which attracts and holds sperm of the same species.
Step 3: Locating the Receptors
These receptor proteins are part of the zona pellucida itself, and binding there triggers the acrosome reaction.
Final Answer:
The fertilizin receptor proteins are present on the zona pellucida. \[ \boxed{\text{(C) }\text{zona pellucida}} \]
The mammalian egg is covered by a thick glycoprotein layer called the zona pellucida. Cells of the corona radiata lie outside it.
Step 2: Role of Fertilizin
Fertilizin is the sperm-receptor glycoprotein of the egg (ZP3 in mammals). It binds antifertilizin on the sperm head, which attracts and holds sperm of the same species.
Step 3: Locating the Receptors
These receptor proteins are part of the zona pellucida itself, and binding there triggers the acrosome reaction.
Final Answer:
The fertilizin receptor proteins are present on the zona pellucida. \[ \boxed{\text{(C) }\text{zona pellucida}} \]
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