The correct answer is: The acrosomal process extends through the egg's vitelline envelope to the egg's plasma membrane to allow the sperm nucleus to pass through to the egg.

Here's why:

1. In sea urchins, the sperm first comes into contact with the egg's jelly coat, triggering the acrosomal reaction.

2. The acrosomal reaction involves the release of enzymes from the acrosome, a specialized vesicle in the head of the sperm.

3. These enzymes digest a path through the jelly coat, and the acrosomal process, a long filament, extends from the sperm.

4. The acrosomal process penetrates the egg's vitelline envelope, a protective layer outside the plasma membrane.

5. The acrosomal process then binds to receptors on the egg's plasma membrane. This binding triggers changes in the egg that block other sperm from entering, a process called the fast block to polyspermy.

6. The plasma membranes of the egg and sperm fuse, allowing the sperm nucleus to pass into the egg cytoplasm.

The second option is incorrect because it describes the process in mammals, not sea urchins. In mammals, the sperm does burrow through the zona pellucida, a thick extracellular matrix that surrounds the egg. However, this is not the case in sea urchins.

Question

The correct answer is: The acrosomal process extends through the egg's vitelline envelope to the egg's plasma membrane to allow the sperm nucleus to pass through to the egg.

Here's why:

1. In sea urchins, the sperm first comes into contact with the egg's jelly coat, triggering the acrosomal reaction.

2. The acrosomal reaction involves the release of enzymes from the acrosome, a specialized vesicle in the head of the sperm.

3. These enzymes digest a path through the jelly coat, and the acrosomal process, a long filament, extends from the sperm.

4. The acrosomal process penetrates the egg's vitelline envelope, a protective layer outside the plasma membrane.

5. The acrosomal process then binds to receptors on the egg's plasma membrane. This binding triggers changes in the egg that block other sperm from entering, a process called the fast block to polyspermy.

6. The plasma membranes of the egg and sperm fuse, allowing the sperm nucleus to pass into the egg cytoplasm.

The second option is incorrect because it describes the process in mammals, not sea urchins. In mammals, the sperm does burrow through the zona pellucida, a thick extracellular matrix that surrounds the egg. However, this is not the case in sea urchins.

Knowee AI · Accepted Answer

The correct answer is: The acrosomal process extends through the egg's vitelline envelope to the egg's plasma membrane to allow the sperm nucleus to pass through to the egg.

Here's why:

1. In sea urchins, the sperm first comes into contact with the egg's jelly coat, triggering the acrosomal reaction.

2. The acrosomal reaction involves the release of enzymes from the acrosome, a specialized vesicle in the head of the sperm.

3. These enzymes digest a path through the jelly coat, and the acrosomal process, a long filament, extends from the sperm.

4. The acrosomal process penetrates the egg's vitelline envelope, a protective layer outside the plasma membrane.

5. The acrosomal process then binds to receptors on the egg's plasma membrane. This binding triggers changes in the egg that block other sperm from entering, a process called the fast block to polyspermy.

6. The plasma membranes of the egg and sperm fuse, allowing the sperm nucleus to pass into the egg cytoplasm.

The second option is incorrect because it describes the process in mammals, not sea urchins. In mammals, the sperm does burrow through the zona pellucida, a thick extracellular matrix that surrounds the egg. However, this is not the case in sea urchins.

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