The following describes a difference between ceramide and sphingomyelin. a. Cera

Question

The following describes a difference between ceramide and sphingomyelin. a. Ceramide doesn't contain a phosphate while sphingomyelin does. b. Ceramide is a glycerophospholipid while sphingomyelin is a sphingosine based lipid. c. Ceramide is a sphingomyelin is a glycerol based lipid. d. Ceramide doesn't contain a phosphocholine while sphingomyelin does. Waxes are made of a. Glycerol and fatty acid b. Long chain fatty acid & long chain polyalcohol c. Long chain fatty acid & long chain monoalcohol d. Glycerol & long chain alcohol 35. The following is a function of a Leukotriene. a. Vasoconstriction b. Bronchoconstriction c. Blood clot formation d. All of the above

Explanation / Answer

A sphingomyelin consists of a phosphocoline or phosphoethanolamine and ceramide, therefore a ceramide is part of sphingomyelin

A ceramide by definition does not contain phosphocoline but esphingomielin doesn´t necessary have phosphocoline

We can say sphingomyelin is a sphingosine base lipid but we cannot say ceramides are glycerolphospholid.

Glycerolphospholipids are formed by glycerol, fat acids and esther and a OH group. These are not related to ceramides.

The most suitable choice is A, ceramides doesn´t contain phospates , they can get phosphate groups at some point but these are not part of the ceramide esential structure, also if we say that ceramides doesn´t contain phosphates then they cannot be glycerophospolips or sphingophospholipids

Ceramides doesn´t contain phosphate, esphingomielin does but can be phosphocoline or phosphoetanolamined

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