7 IS 1.4

What must be able to move into a cell?

• Carbon dioxide

• Oxygen and food particles

• Waste materials

• Light

What is the significance of the double layer of lipid molecules in the cell membrane?

• It provides a rigid structure

• It allows flexibility and selective permeability

• It stores genetic information

• It produces proteins

What is the function of the proteins embedded in the cell membrane?

• To provide energy

• To facilitate the transport of materials

• To store genetic information

• To produce lipids

What is an example of passive transport mentioned in the text?

• Active transport

• Osmosis

• Diffusion

• Endocytosis

In the context of diffusion, what happens over time to the concentration of molecules?

• It increases

• It decreases

• It becomes uneven

• It becomes even

What is the definition of diffusion?

• Movement of molecules from lower to higher concentration

• Movement of molecules from higher to lower concentration

• Movement of molecules using energy

• Movement of molecules using light

What is osmosis?

• The movement of oxygen across a cell membrane

• The diffusion of water molecules across a selectively permeable membrane

• The active transport of nutrients into a cell

• The process of cell division

What is the effect of osmosis on the cells in the bottom photo of Figure 3?

• They have a healthy flow of water

• They are shrinking

• They are dividing

• They are growing larger

Name one substance that is NOT carried by active transport.

• Calcium

• Potassium

• Sodium

• Oxygen

What is the role of the cell membrane in transport?

• To block all molecules

• To provide energy

• To regulate movement of molecules

• To dissolve molecules