Plasma Membranes - VCE Unit 3 Biology

The cell membrane is selectively permeable, which means...

• All materials can enter and leave the cell
• Certain things can enter while others cannot
• The cell manually sorts through all materials
• Only certain cells can interact with the cell.

Most of the cell membrane is made of...

• Lipids
• Carbs
• Proteins
• Nucleic acids

Phospholipid tails are...

• Nonpolar
• Polar

Phospholipid heads are...

• Polar
• Nonpolar

When looking at the cell membrane, where are the lipid heads located?

• Floating between bilayer levels
• Outer part of the bilayer
• Inner part of the bilayer
• Located at different parts throughout the bilayer

Which of the following is responsible for getting complex molecules across the cell membrane?

• Lipids
• Carbs
• Proteins
• Nucleic Acids

Diffusion is the movement of 

• water from low to high concentration
• particles from low to high concentration
• water from high to low concentration
• particles from high to lowconcentration

Which of the following terms means the movement of water from high concentration to low concentration

• diffusion
• prokaryotes
• osmosis
• concentration

Which transport does not require energy?

• Passive
• Active 

Which is true about active transport?

• It requires energy
• it does not require energy
• It moves substances down the concentration gradient
• it moves material from high to low concentration