Which one of the following is not a constituent d cell membrane? [AIPMT(Prelims)-2007) (1)Phospholipids (2)Cholesterol (3)Glycolipids (4)Proline
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Answer:
4. proline is not the part of cell membrane.
Explanation:
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Answer:
Proline
Explanation:
The biological membranes are essentially made up of lipids and proteins. The three main lipid constituents of cell membranes are phospholipids, glycolipids and sterols. The phospholipids contain a phosphate moiety in the hydrophilic head. They can be distinguished into glycerophospholipids with a glycerol backbone and a sphingophospholipids based on 4 sphingosine.
Glycolipids contain one or more monosaccharide residues and are based on 4-sphingosine or ceramide. The steroids are sterol alcohols which contain a cyclopentanone perhydrophenanthrene nucleus. Cholesterol is the most common sterol in animal cell membranes. Proline is an amino acid. It is generally not present in the biological membranes.
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