Membrane Fluidity and Fatty Acids Quiz

What is the effect of unsaturated fatty acids on membrane fluidity?

• They decrease fluidity by increasing viscosity.

• They increase fluidity by decreasing viscosity.

• They have no effect on fluidity.

• They make membranes more rigid.

How do saturated fatty acids affect the melting point of cell membranes?

• They lower the melting point.

• They have no effect on the melting point.

• They raise the melting point.

• They make the melting point fluctuate.

What role does cholesterol play in membrane fluidity at high temperatures?

• It decreases fluidity by stabilizing the membrane.

• It increases fluidity by destabilizing the membrane.

• It has no effect on fluidity.

• It makes the membrane more permeable.

Which type of fatty acids do fish in cold Antarctic waters have more of in their membranes?

• Saturated fatty acids

• Unsaturated fatty acids

• Trans fatty acids

• Polyunsaturated fatty acids

What is the function of desaturase enzymes in certain organisms?

• To increase the proportion of saturated fatty acids.

• To decrease the proportion of unsaturated fatty acids.

• To increase the proportion of unsaturated fatty acids.

• To stabilize the membrane at high temperatures.

What is the process called when materials move into the cell via vesicular formation?

• Exocytosis

• Phagocytosis

• Endocytosis

• Pinocytosis

Which type of transport involves the movement of two molecules in the same direction?

• Uniport

• Symport

• Antiport

• Exocytosis

What is the role of cell adhesion molecules (CAMs)?

• To transport ions across membranes

• To join cells together or connect them to the extracellular matrix

• To facilitate vesicular transport

• To change membrane potential

What type of ion channels are potassium channels?

• Ligand-gated

• Voltage-gated

• Mechanically-gated

• Chemically-gated

What is the process called when vesicles fuse with the plasma membrane to expel contents?

• Endocytosis

• Phagocytosis

• Exocytosis

• Pinocytosis