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cholesterol problem!easy please help!

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cholesterol problem!easy please help!

Postby shiu1 » Sat May 08, 2010 11:48 pm

Cholesterol is an important component of cell membranes in animals. Different
animals have different average concentrations of cholesterol in their membranes.
Provides a few examples and explain how increasing the concentration of cholesterol in a
membrane affects the physical properties of the membrane.

thanks in advance
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another cholesterol problem! help!

Postby shiu1 » Sat May 08, 2010 11:49 pm

What is meant by the term "good cholesterol" and the term "bad cholesterol" in the
context of preventative medicine?
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Postby JackBean » Sun May 09, 2010 6:30 am

if is it so easy, why don't you find it on the internet? :roll:
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re: cholesterol problem!easy please help!

Postby Streaker87 » Sun May 09, 2010 3:27 pm

Hi!

"Bad" cholesterol ist also called "HDL" (high density lipoprotein) und "good" is used for "LDL" (low density lipoprotein).

Provides a few examples and explain how increasing the concentration of cholesterol in a
membrane affects the physical properties of the membrane.

Because Cholesterol is such a big molecule, it needs more space than normal membraneproteins. This makes the membrane more fluid and smooth, even the quantity of cholesterol, of course. The more, the smoother. For example, in cold regions bacteria have more cholesterol in their membrane, otherwise they would freeze.
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Re: cholesterol problem!easy please help!

Postby JackBean » Thu May 13, 2010 9:50 am

Streaker87 wrote:"Bad" cholesterol ist also called "HDL" (high density lipoprotein) und "good" is used for "LDL" (low density lipoprotein).


Better HDL is also called "bad" ch. and LDL "good" cholesterol.

Streaker87 wrote:Because Cholesterol is such a big molecule, it needs more space than normal membraneproteins. This makes the membrane more fluid and smooth, even the quantity of cholesterol, of course. The more, the smoother. For example, in cold regions bacteria have more cholesterol in their membrane, otherwise they would freeze.


Cholesterol is definitely not a big molecule, especially not bigger than proteins!!!
Contrary, it's rigid and thus in higher concentrations makes the membranes less fluid!
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby Streaker87 » Fri May 14, 2010 6:35 pm

You are right! Sorry.

Of course, it's not as big as other proteins. I meant membranelipids (phospholipids).

Probably I mixed the functions with unsaturated phophsolipids.
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Postby JackBean » Sat May 15, 2010 7:21 am

well, it's not even bigger than phospholipids. At least when talking about length. Just the tail is into the middle, where are the flexible ends of other fatty acids. Anyway, not even all fatty acids (phospholipids, if you want) are of the same length ;)
http://www.biolib.cz/en/main/

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Re: cholesterol problem!easy please help!

Postby Streaker87 » Sun May 16, 2010 12:04 pm

Streaker87 wrote:"Bad" cholesterol ist also called "HDL" (high density lipoprotein) und "good" is used for "LDL" (low density lipoprotein

Aehm, it's the other way round:

LDL = "bad"
HDL = "good"

Sry, again :-/ Shame on me.
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