Lipid Bilayer Structure: Glycerophospholipids vs. Sphingolipids

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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 (correct)
It enables the action of acetylcholine
It is a major component of the myelin sheath
It is involved in the synthesis of phosphatidylcholine

What is the typical composition of phospholipids in terms of fatty acid radicals?

Unsaturated acyl radical in the sn-1 position and saturated radical in the sn-2 position
Unsaturated acyl radical in both sn-1 and sn-2 positions
Saturated acyl radical in the sn-1 position and unsaturated radical in the sn-2 position (correct)
Saturated acyl radical in both sn-1 and sn-2 positions

What is the role of phosphatidylserine in cellular processes?

It is a component of the myelin sheath
It is a precursor to ω3 fatty acids
It is involved in the synthesis of triacylglycerols
It plays a role in apoptosis (correct)

What is unique about the structure of sphingomyelins compared to phospholipids?

They contain no glycerol (A) Signup and view all the answers

What is the term for the combination of sphingosine and a fatty acid?

Ceramide (D) Signup and view all the answers

Where are sphingomyelins particularly abundant in the cell membrane?

In lipid rafts (A) Signup and view all the answers

What is the main function of glycolipids in the plasma membrane?

To contribute to cell surface carbohydrates (A) Signup and view all the answers

What is the characteristic of galactosylceramide found in brain and other nervous tissue?

It contains a number of characteristic C24 fatty acids (A) Signup and view all the answers

What is the difference between galactosylceramide and glucosylceramide?

The head group of galactosylceramide is galactose, while glucosylceramide is glucose (B) Signup and view all the answers

What is the name of the carbohydrate-rich region on the cell surface contributed by glycolipids?

Glycocalyx (A) Signup and view all the answers

What is the name of the process by which galactosylceramide is converted to sulfogalactosylceramide?

Sulfation (B) Signup and view all the answers

What is a characteristic of glycerophospholipids and sphingolipids?

They have two long chain hydrocarbon tails (B) Signup and view all the answers

Where are glycolipids particularly found in the body?

Nervous tissue (C) Signup and view all the answers

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 (B) Signup and view all the answers

Which of the following is a characteristic of sphingolipids?

Having one fatty acid tail and one sphingosine tail (A) Signup and view all the answers

What type of phospholipid is the most abundant in cell membranes?

Phosphatidylcholine (D) Signup and view all the answers

What is the role of glycerophospholipids and sphingolipids in cell membranes?

They form the lipid bilayer in cell membranes (A) Signup and view all the answers

Which of the following is a type of glycerophospholipid?