cell membrane

Which statement is TRUE about the asymmetry of the lipid bilayer?

• A. Both leaflets have the same lipid composition
• B. Asymmetry is due to the different types of lipids in each leaflet
• C. Only proteins contribute to membrane asymmetry
• D. Carbohydrates are evenly distributed on both leaflets

What property allows membranes to self-seal if punctured?

• A. Hydrophobic interactions
• B. Covalent bonding
• C. Membrane rigidity
• D. Presence of cholesterol

Which type of protein is involved in facilitating the movement of substances across the membrane?

• A. Peripheral proteins
• B. Integral proteins
• C. Glycoproteins
• D. Lipoproteins

The Fluid Mosaic Model of the plasma membrane was proposed by:

• A. Watson and Crick
• B. Singer and Nicolson
• C. Davson and Danielli
• D. Hooke and Leeuwenhoek

What effect does increasing the proportion of unsaturated fatty acids have on membrane fluidity?

• A. Decreases fluidity
• B. Increases fluidity
• C. Has no effect
• D. Makes the membrane more rigid

Which component acts as a fluidity buffer, maintaining membrane fluidity across various temperatures?

• A. Proteins
• B. Glycolipids
• C. Cholesterol
• D. Carbohydrates

How does temperature affect membrane fluidity?

• A. Higher temperatures decrease fluidity
• B. Lower temperatures increase fluidity
• C. Higher temperatures increase fluidity
• D. Temperature has no effect

Which type of fatty acid chain increases membrane fluidity?

• A. Long-chain saturated fatty acids
• B. Short-chain saturated fatty acids
• C. Unsaturated fatty acids
• D. Trans fatty acids

How do organisms adapt their membrane composition in response to cold environments?

• A. By increasing the saturation of fatty acids
• B. By decreasing the cholesterol content
• C. By increasing the proportion of unsaturated fatty acids
• D. By thickening the membrane