18 Questions
What is the role of dipalmitoyl lecithin in the lungs?
It prevents the adherence of the inner surfaces of the lungs due to surface tension
What is the typical composition of phospholipids in terms of fatty acid radicals?
Saturated acyl radical in the sn-1 position and unsaturated radical in the sn-2 position
What is the role of phosphatidylserine in cellular processes?
It plays a role in apoptosis
What is unique about the structure of sphingomyelins compared to phospholipids?
They contain no glycerol
What is the term for the combination of sphingosine and a fatty acid?
Ceramide
Where are sphingomyelins particularly abundant in the cell membrane?
In lipid rafts
What is the main function of glycolipids in the plasma membrane?
To contribute to cell surface carbohydrates
What is the characteristic of galactosylceramide found in brain and other nervous tissue?
It contains a number of characteristic C24 fatty acids
What is the difference between galactosylceramide and glucosylceramide?
The head group of galactosylceramide is galactose, while glucosylceramide is glucose
What is the name of the carbohydrate-rich region on the cell surface contributed by glycolipids?
Glycocalyx
What is the name of the process by which galactosylceramide is converted to sulfogalactosylceramide?
Sulfation
What is a characteristic of glycerophospholipids and sphingolipids?
They have two long chain hydrocarbon tails
Where are glycolipids particularly found in the body?
Nervous tissue
What is the difference between glycerophospholipids and sphingolipids in terms of their hydrocarbon tails?
Glycerophospholipids have two fatty acid tails, while sphingolipids have one fatty acid and one sphingosine tail
Which of the following is a characteristic of sphingolipids?
Having one fatty acid tail and one sphingosine tail
What type of phospholipid is the most abundant in cell membranes?
Phosphatidylcholine
What is the role of glycerophospholipids and sphingolipids in cell membranes?
They form the lipid bilayer in cell membranes
Which of the following is a type of glycerophospholipid?
Phosphatidylcholine
Compare and contrast the structures of glycerophospholipids and sphingolipids, including their compositions and functions in forming the lipid bilayer in cell membranes.
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