Y1s2 Biochem at University Of Medicine And Pharmacy Of Iasi | Flashcards & Summaries

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2. Complex lipids

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= esters of fatty acids with an alcohol + additional groups
• Phospholipids 

- glycerophospholipids (the alcohol = glycerol)
- sphingophospholipids (the alcohol = sphingosine)
• Glycolipids 

- sphingoglycolipids (the alcohol = sphingosine)

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classification of lipids

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  1. storage lipids: triacylglycerols nonpolar
  2. membrane lipids: phospholipids, glycolipids and cholesterol amphipathic
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Carboxylic acids with hydrocarbon chains ranging from

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4 to 28 carbon atoms

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Most naturally occurring fatty acids have a/n ???? number of C atoms

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even

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Most naturally occurring fatty acids have an even number of C atoms
- at one end
- at the other end
- the hydrocarbon chain is hydro...?

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- at one end - the carboxyl group (ionized at physiologic pH), attached to carbon α
- at the other end - a methyl group (the ω-carbon)
- the hydrocarbon chain is hydrophobic

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When are FA saturated? When unsaturated?

What are "enoic acids"?

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FA may be saturated (containing no double bonds) or unsaturated (containing one
or
more double bonds - these are colectively named „enoic acids”)

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Roles of fatty acids:

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  • source of energy: triglycerides
  • structural components of membrane lipids
  • in the plasma 
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FA used as a source of energy

  1. storage as what
  2. storage where
  3. appearance
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  • stored in the form of triglycerides (TG)
  • in the adipose tissue 
  • TGs are formed of 3 fatty acids esterified with
    glycerol
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2. FA are structural components of

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membrane lipids

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how many percent of the FA are in what form in the plasma?

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more than 90% of the FA are in the form of fatty acid esters
(triglycerides, cholesterol esters, and phospholipids) 

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in the plasma: 

the appearance of free fatty acids 

how are they transported?

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  • free fatty acids (unesterified with glycerol)
  • present in the circulation are transported by albumin
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lipids are soluble in...

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nonpolar solvents,

they have a low solubility in water

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Q:

2. Complex lipids

A:

= esters of fatty acids with an alcohol + additional groups
• Phospholipids 

- glycerophospholipids (the alcohol = glycerol)
- sphingophospholipids (the alcohol = sphingosine)
• Glycolipids 

- sphingoglycolipids (the alcohol = sphingosine)

Q:

classification of lipids

A:
  1. storage lipids: triacylglycerols nonpolar
  2. membrane lipids: phospholipids, glycolipids and cholesterol amphipathic
Q:

Carboxylic acids with hydrocarbon chains ranging from

A:

4 to 28 carbon atoms

Q:

Most naturally occurring fatty acids have a/n ???? number of C atoms

A:

even

Q:

Most naturally occurring fatty acids have an even number of C atoms
- at one end
- at the other end
- the hydrocarbon chain is hydro...?

A:

- at one end - the carboxyl group (ionized at physiologic pH), attached to carbon α
- at the other end - a methyl group (the ω-carbon)
- the hydrocarbon chain is hydrophobic

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Q:

When are FA saturated? When unsaturated?

What are "enoic acids"?

A:

 

FA may be saturated (containing no double bonds) or unsaturated (containing one
or
more double bonds - these are colectively named „enoic acids”)

Q:

Roles of fatty acids:

A:
  • source of energy: triglycerides
  • structural components of membrane lipids
  • in the plasma 
Q:

FA used as a source of energy

  1. storage as what
  2. storage where
  3. appearance
A:
  • stored in the form of triglycerides (TG)
  • in the adipose tissue 
  • TGs are formed of 3 fatty acids esterified with
    glycerol
Q:

2. FA are structural components of

A:

membrane lipids

Q:

how many percent of the FA are in what form in the plasma?

A:

more than 90% of the FA are in the form of fatty acid esters
(triglycerides, cholesterol esters, and phospholipids) 

Q:

in the plasma: 

the appearance of free fatty acids 

how are they transported?

A:
  • free fatty acids (unesterified with glycerol)
  • present in the circulation are transported by albumin
Q:

lipids are soluble in...

A:

nonpolar solvents,

they have a low solubility in water

y1s2 biochem

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