Plasma Membrane & Cell Transport

The cell membrane is selectively permeable, which means that

• Everything can enter and nothing can leave

• Only glucose can enter

• Nothing can enter the cell at all

• Certain things can enter while others cannot

The function of the plasma membrane is to

• regulate what enters and leaves the cell

• make sure each cell reproduces

• fight bacteria and viruses that enter the cell

• store DNA within the cell

Which type of transport does not require energy?

• Active

• Passive

If you put a plant in salt water, it will

• Swell because water diffuses into the cells

• Shrivel because water diffuses out of the cells

• remain unchanged

Diffusion is the movement of

• water from low to high concentrations

• particles from high to low concentrations

• proteins from low to high concentrations

• sugar from high to low concentrations

The movement of molecules against a concentration gradient

• simple diffusion

• active transport

• facilitated diffusion

• osmosis

Most of the cell membrane is made of

• lipids and proteins

• carbohydrates

• glucose and amylase

• nucleic acids

Small polar molecules like O₂ and CO₂ enter a cell through

• facilitated diffusion

• simple diffusion

• osmosis

• phagocytosis

Which part of the phospholipid is hydrophilic?

• phosphate head

• fatty acid tail

• bilayer

• transport protein

hydrophobic means

• water loving

• water mixing

• water fearing

• lipids