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Membrane Structure and Cholesterol Function Quiz

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Membrane Structure and Cholesterol Function Quiz

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Questions and Answers

What is the main function of cholesterol in the cell membrane?

Enhance membrane deformability

Decrease membrane permeability to small molecules (correct)

Promote aggregation of hydrocarbon chains

Increase membrane fluidity

In what way do glycolipids contribute to cell function?

Provide structural support to the cell membrane

Increase cell stickiness

Enhance cell recognition and adhesion (correct)

Act as receptors for external molecules

What is a characteristic of integral membrane proteins?

Easily extracted from the membrane

Extend across the bilayer as a single alpha helix exclusively

Only associated with one monolayer of the bilayer

Interact with hydrophobic tails of lipid molecules (correct)

What is the purpose of sphingolipids in the cell membrane?

Serve as receptor sites Signup and view all the answers

How do peripheral membrane proteins differ from integral membrane proteins?

peripheral proteins are temporarily associated with the bilayer Signup and view all the answers

What is the main characteristic of lipid molecules in cell membranes?

Being amphiphilic with a hydrophilic end and a hydrophobic end Signup and view all the answers

How do unsaturated bonds in phospholipids affect membrane structure?

Cause more disorder making it harder to freeze Signup and view all the answers

Why is the transition temperature lower in membranes with more double bonds in their phospholipids?

To accommodate the increased disorder due to unsaturated bonds Signup and view all the answers

How does tail length and saturation of phospholipids affect membrane fluidity?

Influence how phospholipids pack and thus affect fluidity Signup and view all the answers

What is the role of phospholipids in the structure of a lipid bilayer?

Function as a barrier to protect the cell Signup and view all the answers