The structures of Lipid molecules

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mistique
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The structures of Lipid molecules

Post by mistique » Mon Feb 26, 2007 11:32 am

Hey everyone out there.

Does anyone know what the answer to this question could possibly be:

"Note the structures of the three steroid lipid molecules (in this case, cholesterol, testosterone and oestrogen). Compare their structure with the general structures of fat and phospholipid molecules."

It would be very helpful if someone could help me with this question as i have a SAC coming up soon..
Thanks :) [color=blue]

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victor
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Post by victor » Fri Mar 02, 2007 2:09 pm

Compare? okay then...
Well, as far as I know that cholesterol, estrogen and testosterone have one thing in common, which is steroid ring. This steroid ring is a lipid, which is formed as a cyclic ring.
Whicle those whom you call fat, have an aliphatic (open) form as a chain. Fat is a triacyl glycerol, which consist of three acyl molecules and one glycerol. In phospolipid, commonly this acyl is the main component of the hydrophobic tail, whicle the phosphate group act as a hydrophilic head.
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Dr.Stein
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Post by Dr.Stein » Sat Mar 03, 2007 2:00 am

Both testosterone and estrogen are derived from cholesterol. Steroid has a special characteristic, which is a cyclo-pentano-perhydro-phenanthren nucleus. Cholesterol will undergo many pathways of enzymatic reaction a.k.a. steroidogenesis to derive its steroid hormones, i.e. gonad hormones and cortex adrenal hormones.
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