Which of the following is true of sphingolipids? sphingerbrosipidsine 96. 100. T

Question

Which of the following is true of sphingolipids? sphingerbrosipidsine 96. 100. The inner (plasma) membrane of E. coli is about 75% lipid and 25% protein by weight. How many molecules of membrane lipid are there for each molecule of protein? (Assume that the average protein is 50,000 g/mol and the average lipid is 750 g/mol.) Cerebrosides and gangliosides are sphingolipids. Phosphatidylcholine is a typical sphingolipid. They always contain glycerol and fatty acids. They contain two esterified fatty acids. They may be charged, but are never amphipathic A. B. C. is a A. 1 B. 50 C. 200 D. 10,000 E. 50,000 D. E. 97. Sphingosine is not a component of A. cardiolipin. B. ceramide C. cerebrosides. D. gangliosides. E. sphingomyelin. Which of the following statements about sterols is true? 98. A. B. C. All sterols share a fused-ring structure with four rings. Sterols are found in the membranes of all living cells. Sterols are soluble in water, but less so in organic solvents such as chloroform. Sterols are derived from glycerol and fatty acids. Cholesterol esters are more soluble than cholesterol. D. E. 99. Fatty acids are a component of: A. carotenes. B. cerebrosides. C. sterols. D. vitamin D. E. vitamin K.

Explanation / Answer

Question 96

A) Cerebrosides and gangliosides are sphingolipids. .---------------------answer

Cerebrosides : They are group of complex lipids present in the sheaths of nerve fibres.

ganglioside : It is a molecule composed of a glycosphingolipid

remaining options doensnot show sphingolipids.

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Question 97

Sphingosine is not a component of:

A) cardiolipin.---------------------answer

Cardiolipin : It is a component of the inner mitochondrial membrane.

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b)ceramide –

it is composed of sphingosine and a fatty acid

C) cerebrosides. . –wrong answer

D) gangliosides. . –wrong answer.

it is composed of glycosphingolipid.

E) sphingomyelin. . –wrong answer.

It is sphingolipid found in cell membranes.

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Question 98

Which of the following statements about sterols is true?

A) All sterols share a fused-ring structure with four rings. .---------------------answer

B) Sterols are found in the membranes of all living cells. –wrong answer

It is not part of membranes of all living cells

C) Sterols are soluble in water, but less so in organic solvents such as chloroform. –wrong answer

Sterols are soluble in organic solvents

D) Stigmasterol is the principal sterol in fungi. –wrong answer

Stigmasterol; It is a plant sterol.
E) The principal sterol of animal cells is ergosterol. –wrong answer

ergosterol : It is a sterol found in cell membranes of fungi and protozoa,

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Question 99

Fatty acids are a component of:

A) carotenes. –wrong answer

carotene is unsaturated hydrocarbon substances having the formula CH

C) sterols. –wrong answer

Sterols, are steroid alcohols,

D) vitamin D. –wrong answer

Vitamin D ------------- fat-soluble secosteroids

E) vitamin K. –wrong answer

vitamin K. -------Phytomenadione

B) cerebrosides. .---------------------answer

Cerebrosides : they are group of glycosphingolipids

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