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Which one of the following is not a constituent of cell membrane?
A
glycolipids
B
proline
C
phospholipids
D
cholesterol
Detailed Solution
The cell membrane is composed mainly of lipids and proteins, with some carbohydrates.
The lipids are arranged in a bilayer and are mainly phospholipids (phosphoglycerides).
Cholesterol is also present in the membranes of animal cells, where it regulates the fluidity of the membrane.
Carbohydrates are present as glycolipids and glycoproteins on the outer surface.
Proline is a free amino acid. It is a building block of proteins (for example collagen), but as such it is not a structural constituent of the cell membrane.
So the one that is not a constituent of the cell membrane is proline.
The lipids are arranged in a bilayer and are mainly phospholipids (phosphoglycerides).
Cholesterol is also present in the membranes of animal cells, where it regulates the fluidity of the membrane.
Carbohydrates are present as glycolipids and glycoproteins on the outer surface.
Proline is a free amino acid. It is a building block of proteins (for example collagen), but as such it is not a structural constituent of the cell membrane.
So the one that is not a constituent of the cell membrane is proline.