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Yolk

yolk

1. The yellow part of an egg; the vitellus.

2. (Science: zoology) An oily secretion which naturally covers the wool of sheep.

(Science: anatomy) Yolk cord, the umbilical vesicle. See Unbilical.

Origin: OE. Yolke, yelke, yolke, yelke, AS. Geoloca, geoleca, fr. Geolu yellow. See Yellow

Alternative forms: yelk. Nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg).The part of eggs that contains nutrients, primarily consisting of protein and fat molecules which provide the basic building blocks of life. Evolutionary change has resulted in changes in mammal eggs, where the embryo obtains food from the placenta as opp.


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Humans are Deuterostomes. Right?..

... no archenteron in human embryo at all. In fact, there are primitive node/streak/groove. Besides, that primitive groove is somehow connected to the yolk-sac by means of blastopore (again, wiki says). So how did blastopore end up between yolk-sac and primitive groove? And the initial question that ...

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by Siroggak
Tue Aug 12, 2014 4:46 pm
 
Forum: Human Biology
Topic: Humans are Deuterostomes. Right?..
Replies: 0
Views: 188

Stem Cells

... cell-ness. Two factors- one which induces tumor for example, and other which makes an animal immune to a X pathogen, can both be injected into yolk sac or bone marrow. If the tumor developed and animal is protected against infection upon exposure to that X pathogen, we can say vaguely that ...

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by Shaanu
Thu May 09, 2013 3:00 pm
 
Forum: Molecular Biology
Topic: Stem Cells
Replies: 0
Views: 1308

Stem Cells

... cell-ness. Two factors- one which induces tumor for example, and other which makes an animal immune to a X pathogen, can both be injected into yolk sac or bone marrow. If the tumor developed and animal is protected against infection upon exposure to that X pathogen, we can say vaguely that ...

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by Shaanu
Thu May 09, 2013 9:45 am
 
Forum: Genetics
Topic: Stem Cells
Replies: 5
Views: 4549

Re: Please help with my work

...  False  if carbohydrate supply is very low, the body will automatically use your proteins  as an energy source.  4d. False found in membrane not yolk 4g False an example of anabolism is the formation of muscle proteins from amino acids. 5 Sodium and Calcium Calcium- needed to maintain strong ...

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by Olympic
Tue Jul 24, 2012 6:47 pm
 
Forum: General Discussion
Topic: Please help with my work
Replies: 6
Views: 8763

Diet Of Laying Birds

the inner liquid is mainly water, proteins (egg white and yolk) and lipids (yolk), nothing that special, what the bird could not produce by itself. But the calcium is more important (or rather more needed to obtain from environment).

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by JackBean
Mon Jan 30, 2012 4:46 pm
 
Forum: Zoology Discussion
Topic: Diet Of Laying Birds
Replies: 13
Views: 6783
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