Membrane Fluidity and Fatty Acids Quiz

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

• They decrease membrane fluidity.

• They increase membrane fluidity.

• They have no effect on membrane fluidity.

• They make the membrane rigid.

How do saturated fatty acids affect the viscosity of cell membranes?

• They increase viscosity and decrease fluidity.

• They decrease viscosity and increase fluidity.

• They have no effect on viscosity.

• They make the membrane more flexible.

What role does cholesterol play in the cell membrane at high temperatures?

• It decreases membrane fluidity.

• It increases membrane permeability.

• It stabilizes the membrane and raises the melting point.

• It makes the membrane more rigid.

Which organisms are likely to have a higher composition of unsaturated fatty acids in their membranes?

• Organisms living in hot environments.

• Organisms living in cold environments.

• Organisms with a cell wall.

• Organisms with high metabolic rates.

What is the function of desaturase enzymes in certain organisms?

• To decrease the proportion of unsaturated fatty acids.

• To increase the proportion of unsaturated fatty acids.

• To stabilize the membrane at high temperatures.

• To make the membrane more permeable.

What is the process called when solid materials are ingested into a cell via vesicular formation?

• Pinocytosis

• Exocytosis

• Phagocytosis

• Endocytosis

Which type of transport involves the movement of materials out of a cell using vesicles?

• Endocytosis

• Exocytosis

• Phagocytosis

• Pinocytosis

What type of ion channels change conformation according to the voltage across membranes?

• Ligand-gated

• Voltage-gated

• Mechanically-gated

• Chemically-gated

What is the movement of two molecules in the same direction called?

• Uniport

• Symport

• Antiport

• Export

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 synthesize proteins