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 the membrane 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 membrane impermeable.

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

• It decreases membrane fluidity.

• It stabilizes the membrane and raises the melting point.

• It makes the membrane more permeable.

• It increases membrane fluidity.

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

• Organisms in hot environments.

• Fish in cold Antarctic waters.

• Desert animals.

• Tropical birds.

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 materials move into a cell via vesicular formation?

• Exocytosis

• Endocytosis

• Phagocytosis

• Pinocytosis

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

• Uniport

• Symport

• Antiport

• Exocytosis

What type of ion channels are potassium channels?

• Ligand-gated

• Voltage-gated

• Mechanically-gated

• Chemically-gated

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

• Transport ions across membranes

• Join cells together or connect them to the extracellular matrix

• Facilitate vesicular transport

• Move solutes against a gradient

What is an example of indirect active transport?

• Movement of glucose in the kidneys

• Movement of sodium ions in neurons

• Movement of potassium ions in neurons

• Movement of calcium ions in muscles