memb class test

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1. Which of the following is the most abundant lipid found in the plasma membrane?

• a) Sphingolipids
• b) Cholesterol
• c) Phospholipids
• d) Glycolipids

What is the role of cholesterol in the plasma membrane?

• a) It acts as a carrier protein for transport.
• b) It stabilizes the membrane's fluidity across temperature ranges.
• c) It binds to glycolipids for cell signaling.
• d) It facilitates passive diffusion of ions.

In biological membranes, the hydrophobic tails of phospholipids are composed of:

• a) Glycerol and phosphate groups
• b) Fatty acid chains
• c) Sphingosine backbone
• d) Carbohydrate moieties

Which of the following statements about membrane proteins is true?

• a) Integral proteins are only found on the inner surface of the membrane.
• b) Peripheral proteins are embedded within the lipid bilayer.
• c) Integral proteins span across the membrane, often functioning as channels.

Glycolipids in the plasma membrane are primarily located:

• a) On the inner leaflet of the bilayer
• b) On the outer leaflet of the bilayer
• c) Equally distributed between inner and outer leaflets
• d) Within membrane protein channels

Which of the following phospholipids is predominantly located on the inner leaflet of the plasma membrane?

• a) Phosphatidylserine
• b) Phosphatidylcholine
• c) Sphingomyelin
• d) Glycolipids

Which of the following molecules can freely diffuse across the lipid bilayer without the need for transport proteins?

• a) Glucose
• b) Na+ ions
• c) O2 and CO2
• d) Amino acids