______ prevents another sperm from binding to the sperm receptors on the oocyte's plasma membrane

Question

BlackTom AI · Accepted Answer

The prompt asks about a process at fertilization related to preventing multiple sperm from fertilizing the same oocyte.
Option 1: Meiosis. This is the cell division that produces gametes with half the number of chromosomes, not a mechanism that blocks additional sperm from binding. Therefore this choice does not address sperm binding or polyspermy prevention.
Option 2: Allurin. Allurin is a protein involved in sperm chemotaxis in some species, guiding sperm toward the egg, not in the blockade of extra sperm binding. Hence this option does not pertain to preventing polyspermy.
Option 3: Blocking of polyspermy. This phrase directly describes the mechanism by which the egg prevents more than one sperm from binding or fusing with the oocyte, ensuring monospermy. This fits the concept of preventing multiple fertilizations.
Option 4: Fusion. Fusion refers to the merging of membranes or cytoplasmic contents, which occurs after sperm binding in the fertilization process, but it is not the mechanism that prevents additional sperm from binding to the oocyte’s receptors. Therefore it does not describe the block against polyspermy.
In summary, the statement that captures the protective step preventing another sperm from binding to the sperm receptors on the oocyte’s plasma membrane is the action described as blocking of polyspermy, while the other options either describe different fertilization stages or processes not related to preventing polyspermy.

Anatomy and Physiology Systems I (1016MSC_NA_3251) EOT Practice Exam (ONLINE)

______ prevents another sperm from binding to the sperm receptors on the oocyte's plasma membrane

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