Cell Membrane 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 the cell membrane at high temperatures?

• It increases fluidity by lowering the melting point.

• It stabilizes the membrane and raises the melting point.

• It makes the membrane more permeable.

• It has no effect on the membrane.

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 no 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 membrane potential by moving ions in a single direction?

• Symport

• Antiport

• Uniport

• Ligand-gated

What is an example of indirect active transport mentioned in the text?

• Absorption of glucose in the kidneys

• Movement of sodium ions

• Phagocytosis

• Exocytosis

What do cell adhesion molecules (CAMs) do?

• Facilitate vesicular transport

• Join cells together or connect them to the extracellular matrix

• Move solutes against a gradient

• Change membrane potential