Cellular Transport Insights for the Biology Keystone Exam

What is the primary function of cell walls in plants?

• To protect and maintain the cell's shape

• To provide energy to the cell

• To facilitate cell movement

• To control the entry and exit of substances

Which of the following is NOT a characteristic of cell walls?

• Rigid and porous structure

• Made of cellulose in plants

• Provides structural support

• Present in animal cells

What is diffusion?

• Movement of molecules from an area of low concentration to high concentration

• Movement of molecules from an area of high concentration to low concentration

• Active transport of ions against the concentration gradient

• Movement of water through a semi-permeable membrane

What happens to a cell in a hypotonic solution?

• It swells

• It bursts

• It shrivels

• It remains the same

What is the main difference between osmosis and diffusion?

• Diffusion can only occur in liquids, while osmosis can occur in gases and liquids

• Diffusion requires a semi-permeable membrane, while osmosis does not

• Osmosis requires energy, while diffusion does not

• Osmosis involves the movement of water, while diffusion involves other molecules

In which environment do plant cells prefer to be?

• Hydrophobic

• Hypertonic

• Isotonic

• Hypotonic

Which molecule is typically transported by facilitated diffusion?

• Glucose

• Oxygen

• Carbon dioxide

• Sodium ions

What distinguishes facilitated diffusion from simple diffusion?

• Facilitated diffusion involves helper proteins

• Facilitated diffusion requires ATP

• Facilitated diffusion only occurs in prokaryotic cells

• Facilitated diffusion does not involve a concentration gradient

What is the role of ATP in active transport?

• It forms the cell membrane

• It provides the energy needed for the transport

• It acts as a carrier protein

• It stabilizes the concentration gradient

What is the primary role of the sodium-potassium pump?

• To maintain a concentration gradient across the cell membrane

• To destroy harmful ions in the cell

• To facilitate the diffusion of sodium and potassium

• To produce ATP for the cell