What is another name for the cell membrane?

• Cell wall

• Plasma membrane

• Nuclear membrane

• Cytoplasm

What does it mean if a cell membrane is "semi-permeable"?

• It lets everything pass through easily.

• It lets nothing pass through.

• It lets some things pass through but not others.

• It only lets water pass through.

What are the two main parts of a phospholipid molecule?

• Sugar and salt

• Phosphate head and fatty acid tails

• Protein and carbohydrate

• Water and oil

Which part of the cell membrane helps cells identify each other, like for blood types?

• Proteins

• Cholesterol

• Carbohydrates

• Phospholipids