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Egg coat

Egg coat

a layer of glycoproteins and other stuff which surrounds an egg (ovum), just outside of the eggs cell membrane. The coat protects the egg, and for organisms which practice external fertilization (fertilization outside of the parents bodies) it can help prevent the sperm of other species from entering the egg. For the eggs of mammals, the egg coat is called the zona pellucida and for sea urchins (a popular study organism for developmental biologists) it is called the vitelline layer.


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help with some questions

... develop in every seed -the fertilized antipodals develop into the seed coat Which most closely represents the male gametophyte of seed-bearing plants? -ovule -microspore mother cell -pollen grain -embryo sac -fertilized egg thanks!

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by nile_opeth
Thu May 03, 2007 12:56 am
 
Forum: Botany Discussion
Topic: help with some questions
Replies: 2
Views: 2389

The Fiber Disease

... When I was at work on this past Thursday, there was a mass exodus of eggs from my feet and legs due to the application of sulfa to both the feet ... olive oil to keep the pure tea tree oil from burning the skin and to coat the skin) acts as pyrethrins and remove the parasite from your skin ...

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by reliefseeker
Sun Sep 24, 2006 3:48 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5410415

Why I think Neo-darwinism is dead

... materialize regardless of mutations or genes? Are they afraid the coat color of the offspring will change? Limb length might grow or shrink? ... soul is that excitable little something that awakens when the sperm and egg embrace In the early embryo, forces are activated that evoke the form ...

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by supersport
Sat Aug 26, 2006 11:56 pm
 
Forum: Evolution
Topic: Why I think Neo-darwinism is dead
Replies: 26
Views: 20275

I have to write an essay!

... structure etc) -part of cell structure. here you have: -glycocalix(cell coat); clasifications(glicolipids, glicoproteins, proteoglucans) -terminal ... -intercellular binding(mention selectines, binding of sperm cell to egg cell) And that is only for the role of sugars in the body(AND THEY AR ...

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by MrMistery
Sun Nov 27, 2005 5:23 pm
 
Forum: Molecular Biology
Topic: I have to write an essay!
Replies: 16
Views: 6045


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