The Cell in its Environment

The cell membrane is:

• low concentration

• high concentration

• actively permeable

• selectively permeable

What does selectively permeable mean?

• Every substance can pass through the cell membrane.

• No substances can pass through the cell membrane.

• All substances can pass through the cell membrane.

• Only some substances can pass through the cell membrane.

In diffusion, molecules move from an area of ___________ concentration to an area of ____________ concentration.

• high, low

• low, high

• big, little

• little, big

Osmosis is the diffusion of _______________ molecules through a selectively permeable membrane.

• food

• water

• waste

• salt

Moving materials through the cell membrane without using energy is called:

• active transport

• passive transport

• diffusion

• osmosis

The diffusion of water molecules through a selectively permeable membrane:

• Active transport

• Diffusion

• Passive transport

• Osmosis

Active transport requires:

• protein

• energy

• concentration

• transportation

This image represents:

• osmosis

• transport

• waste

• diffusion

One way that cells move materials by active transport:

• engulfing

• concentration

• transport

• molecules