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 solid materials are taken into the cell via vesicular formation?

• Pinocytosis

• Exocytosis

• Phagocytosis

• Endocytosis

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

• Uniport

• Symport

• Antiport

• Exocytosis

What is the role of voltage-gated potassium channels in neurons?

• They bind to neurotransmitters

• They change conformation with ligand binding

• They change conformation with voltage changes

• They transport glucose

What is the function 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 is an example of indirect active transport?

• Movement of sodium ions in neurons

• Absorption of glucose in the kidneys

• Vesicular transport of proteins

• Binding of ligands to receptors