Phospholipids

Phopholipids

Q. 1 Glycerol  is  the  backbone  of  all  of  the following phospholipids EXCEPT
 A Phosphatidylethanolamine
 B Cardiolipin
 C Phosphatidylcholine
 D Sphingomyelin
Q. 1 Glycerol  is  the  backbone  of  all  of  the following phospholipids EXCEPT
 A Phosphatidylethanolamine
 B Cardiolipin
 C Phosphatidylcholine
 D Sphingomyelin
Ans. D

Explanation:

Sphingomyelin   = phosphorylcholine + ceramide

Ceramide            = fatty acid + sphingosine

Sphingosine        = condensing palmitic acid with a decarboxylated   serine   and   then   reducing   the product

Glycerol  never  is  involved  in  the  structure  of sphingomyelin. Phosphatidylethanolamine, cardiolipin, phosphatidylcholine, and phosphatidylinositol are synthesized using phosphatidic acid as the basic building block  Phosphatic acid  is  diacylglycerol with a phosphate  ester on carbon three; therefore, glycerol is the backbone of all of these compounds. FAQ Sphingomyelin :-

–  Membranous myelin sheath that surrounds nerve cell axons.

–    It is the only sphingolipid NOT derived from Glycerol.

–       Associated  with  increased  accumulation  in Niemann-Pick  Disease.


Q. 2

Function of phospholipid in cell membrance is:

 A

Cell to cell variation

 B

Transduction of Signals

 C

Transmembrane preparation of protein

 D

DNA replication

Q. 2

Function of phospholipid in cell membrance is:

 A

Cell to cell variation

 B

Transduction of Signals

 C

Transmembrane preparation of protein

 D

DNA replication

Ans. B

Explanation:

B i.e. Transduction of signals


Q. 3

Which of the following phospholipid has antigenic acitivity ‑

 A

Plasmalogen

 B

Cardiolipin

 C

Phosphatidylcholine

 D

Sphingomyelin

Q. 3

Which of the following phospholipid has antigenic acitivity ‑

 A

Plasmalogen

 B

Cardiolipin

 C

Phosphatidylcholine

 D

Sphingomyelin

Ans. B

Explanation:

Ans. is ‘b i.e., Cardiolipin 

  • Cardiolipin is the only human glycerophospholipid that possess antigenic properties”
  • Cardiolipin is the major lipid of inner mitochondrial membrane.

Q. 4

Which of the following is not a phospholipid ‑

 A

Lecithine

 B

Plasmalogen

 C

Cardiolipin

 D

Ganglioside

Q. 4

Which of the following is not a phospholipid ‑

 A

Lecithine

 B

Plasmalogen

 C

Cardiolipin

 D

Ganglioside

Ans. D

Explanation:

Ans. is ‘d’ i.e., Ganglioside

Phospholipids are :

  1. Glycerophospholipids (glycerol containing) :- Phosphatidylcholine (lecithin), phosphatidylethanolamine (cephaline), phosphatidylserine, phosphatidylinositol, plasmalogens, lysophospholipids, cardiolipin.
  2. Sphingophospholipids (sphingosine containing) :- Sphingomyeline

Quiz In Between



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