AP Bio Unit 2 Test: MC

Front

What is the primary function of a vacuole in plant cells?

Back

The vacuole serves as a storage compartment, often taking up much of the volume of a plant cell, and helps maintain turgor pressure.

Front

How do contractile vacuoles function in paramecia?

Back

Contractile vacuoles remove excess intracellular water by contracting and expelling water, especially in hypotonic environments.

Front

What type of molecules can easily pass through a cell membrane?

Back

Small and nonpolar molecules pass through a cell membrane most easily due to their size and lack of charge.

Front

What happens to water movement when a plant cell is placed in a hypertonic solution?

Back

Water moves out of the plant cell, leading to plasmolysis.

Front

What is solute potential?

Back

Solute potential is the measure of the tendency of water to move by osmosis, influenced by the concentration of solutes.

Front

What is pressure potential in plant cells?

Back

Pressure potential is the physical pressure exerted by the fluid in the cell against the cell wall, contributing to turgor pressure.

Front

What is the relationship between osmolarity and water movement in cells?

Back

As osmolarity decreases, water enters the cell by osmosis, increasing the contraction rate of contractile vacuoles.

Front

What is the significance of dialysis in studying osmosis?

Back

Dialysis allows for the observation of water movement across a semi-permeable membrane, helping to determine solute concentrations.

Front

How does temperature affect the rate of diffusion?

Back

Higher temperatures increase the kinetic energy of molecules, leading to faster diffusion rates.

Front

What is the difference between isotonic, hypertonic, and hypotonic solutions?

Back

Isotonic solutions have equal solute concentrations, hypertonic solutions have higher solute concentrations outside the cell, and hypotonic solutions have lower solute concentrations outside the cell.