Which of the following best describes the interaction between the sperm and the egg in the case of the sea urchin?a)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg→ exocytosis of the sperm acrosomal vesicle to release its enzymes → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.b)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg→exocytosis of the sperm acrosomal vesicle to release its enzymes → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.c)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → exocytosis of the sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.d)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → passage of sperm through this extracellular matrix → binding of the sperm to the extracellular matrix of the egg → exocytosis of the a sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.Correct answer is option 'A'. Can you explain this answer?

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Which of the following best describes the interaction between the sperm and the egg in the case of the sea urchin?

a)
Chemoattraction of sperm to the egg by soluble molecules secreted by the egg→ exocytosis of the sperm acrosomal vesicle to release its enzymes → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.
b)
Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg
→
exocytosis of the sperm acrosomal vesicle to release its enzymes → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.
c)
Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → exocytosis of the sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.
d)
Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → passage of sperm through this extracellular matrix → binding of the sperm to the extracellular matrix of the egg → exocytosis of the a sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.

Correct answer is option 'A'. Can you explain this answer?

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Which of the following best describes the interaction between the sper...

Concept:

In many species, the meeting of sperm and egg is not a simple matter.
Many marine organisms release their gametes into the environment.
That environment may be as small as a tide pool or as large as an ocean.
Moreover, it is shared with other species that may shed their sex cells at the same time.
These organisms are faced with two problems: sperm and eggs need to meet in such a dilute concentration, and sperm be prevented from trying to fertilize eggs of another species

Explanation:

Sea urchin fertilization is external.
The sperm is activated by and chemotactically attracted to the egg.

Five important events of fertilization in the sea urchin are:

The chemo-attraction of the sperm to the egg by soluble molecules secreted by the egg
The exocytosis of the acrosomal vesicle to release its enzymes
The binding of the sperm to the extracellular envelope (vitelline layer or zona pellucida) of the egg
The passing of the sperm through this extracellular envelope
Fusion of egg and sperm cell plasma membranes

Fig 1:

Five important events of fertilization in the sea urchin

The acrosome reaction is triggered by contact of the sperm with the jelly coat, a complex extracellular matrix surrounding the egg.
This causes rapid fluxes of ions, fusion of the acrosome membrane with the plasma membrane, and extension of the acrosomal filament.
The acrosome membrane inserted into the sperm plasma membrane covers the acrosomal filament and contacts the plasma membrane of the egg to initiate sperm-egg fusion.
One consequence of sperm-egg fusion is insertion of the sperm plasma membrane into the egg plasma membrane, producing a mosaic patch.
The sperm components inserted persist in development and can be identified by quantitative methods after gastrulation.
Another consequence of sperm-egg fusion is the cortical reaction in which thousands of vesicles fuse with the egg surface, thereby adding their membranes to the egg plasma membrane and releasing their contents upon the egg surface.
This results in an approximate doubling of the amount of membrane on the egg surface in a few seconds and produces a mosaic topography.
The excess surface membrane is accommodated by elongation of egg microvilli.
The cortical reaction causes a detachment of the egg glycocalyx or vitelline membrane, and this layer is elevated from the egg surface.
Contents of the cortical granules combine with and alter the vitelline membrane by a hardening reaction to produce the fertilization coat.
Hardening involves a peroxidase-mediated tyrosine crosslinking, requiring a burst of oxygen consumption by the egg to generate hydrogen peroxide and resulting in chemiluminescence.
These events are followed by activation of metabolic processes in the egg and changes which protect the egg against polyspermy.

Hence the correct answer is option 1.

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Which of the following best describes the interaction between the sperm and the egg in the case of the sea urchin?a)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg→ exocytosis of the sperm acrosomal vesicle to release its enzymes → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.b)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg→exocytosis of the sperm acrosomal vesicle to release its enzymes → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.c)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → exocytosis of the sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.d)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → passage of sperm through this extracellular matrix → binding of the sperm to the extracellular matrix of the egg → exocytosis of the a sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.Correct answer is option 'A'. Can you explain this answer?

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Which of the following best describes the interaction between the sperm and the egg in the case of the sea urchin?a)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg→ exocytosis of the sperm acrosomal vesicle to release its enzymes → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.b)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg→exocytosis of the sperm acrosomal vesicle to release its enzymes → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.c)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → exocytosis of the sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.d)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → passage of sperm through this extracellular matrix → binding of the sperm to the extracellular matrix of the egg → exocytosis of the a sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.Correct answer is option 'A'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Which of the following best describes the interaction between the sperm and the egg in the case of the sea urchin?a)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg→ exocytosis of the sperm acrosomal vesicle to release its enzymes → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.b)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg→exocytosis of the sperm acrosomal vesicle to release its enzymes → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.c)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → exocytosis of the sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.d)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → passage of sperm through this extracellular matrix → binding of the sperm to the extracellular matrix of the egg → exocytosis of the a sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following best describes the interaction between the sperm and the egg in the case of the sea urchin?a)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg→ exocytosis of the sperm acrosomal vesicle to release its enzymes → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.b)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg→exocytosis of the sperm acrosomal vesicle to release its enzymes → passage of sperm through this extracellular matrix → fusion of egg and sperm cell membranes.c)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → binding of the sperm to the extracellular matrix of the egg → passage of sperm through this extracellular matrix → exocytosis of the sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.d)Chemoattraction of sperm to the egg by soluble molecules secreted by the egg → passage of sperm through this extracellular matrix → binding of the sperm to the extracellular matrix of the egg → exocytosis of the a sperm acrosomal vesicle to release its enzymes → fusion of egg and sperm cell membranes.Correct answer is option 'A'. Can you explain this answer?.

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