Grade 9 science cell (plasma) membrane

Define cell (plasma) membrane

• a solid, rigid boundary that surrounds a cell

• the outer surface of a membrane that doesn't allow any substances to move into a cell

• flexible boundary of a cell that separates a cell from its surroundings

• a protective layer around the cell that provides strength

Which types of molecule are the main component of the cell (plasma) membrane?

• carbohydrate and proteins

• lipids and proteins

• lipids and carbohydrates

• DNA and proteins

This image is an example of a phospholipid. Which part of a phospholipid is HYDROPHOBIC?

• the phosphate "head"

• the lipid "tails"

This image is an example of a phospholipid. Which part of a phospholipid would face the watery environment, either inside or outside a cell?

• the phosphate "head"

• the lipid "tails"

Which of the following is not a main role of the cell membrane?

• providing strength for the cell

• cell recognition

• allowing cells to communicate with each other

• controlling the movement of substance sin and out of a cell

Where can PROTEINS be found when part of a plasma membrane?

• Embedded on the outside of the membrane

• Embedded on the inside of the membrane

• Embedded the whole way through the membrane

• All the above

What is the "big idea" of the fluid mosaic model of cell (plasma) membranes?

• the plasma membrane creates a specialized FLUID that looks like a MOSAIC.

• the plasma membrane is a MOSAIC of different fluids.

• the fluid mosaic model is NOT related to the plasma membrane.

• a plasma membrane is a MOSAIC of components that move FREELY and FLUIDLY.

What does "hydrophilic" mean?

• water loving, associates with water

• water fearing, does not associate with water

• water loving and fearing

• attracted to fats and oils

The width of a cell (plasma) membrane is most appropriately measured in what sort of units?

• nanometres

• millimetres

• centimetres

• metres