Plasma membrane

Front

Which of the following statements about the fluid mosaic model of the plasma membrane is false?

Back

Proteins embedded in the membrane are fixed and immobile

Front

The plasma membrane's selective permeability is primarily due to:

Back

The hydrophobic core created by phospholipid tails

Front

Which of the following describes the role of cholesterol in the plasma membrane?

Back

Regulates membrane fluidity by preventing phospholipids from packing too closely together

Front

Which of the following phosphoglycerides is most commonly found in the inner leaflet of the plasma membrane?

Back

Phosphatidylserine

Front

Which of the following is a major difference between phosphoglycerides and sphingolipids in the plasma membrane?

Back

Phosphoglycerides have a glycerol backbone, while sphingolipids have a sphingosine backbone

Front

Which of the following phosphoglycerides is preferentially targeted for apoptosis signaling when externalized to the outer leaflet of the plasma membrane?

Back

Phosphatidylserine

Front

How do sphingolipids contribute to the formation of lipid rafts in the plasma membrane?

Back

By their ability to interact with cholesterol and form ordered microdomains

Front

In which region of the plasma membrane is cholesterol most likely to be found?

Back

Preferentially associated with lipid rafts in both leaflets

Front

Which of the following explains why cholesterol is critical in the formation of lipid rafts in the plasma membrane?

Back

 Cholesterol stabilizes the thicker, more ordered regions of the membrane where sphingolipids and saturated lipids are concentrated

Front

Membrane fluidity is crucial for various cellular functions. Which of the following best describes the relationship between temperature and membrane fluidity?

Back

Lower temperatures reduce membrane fluidity due to increased fatty acid tail interaction