Cell Transport

What are the functions of the cell membrane?

• regulate what comes in and out

• producing energy for the cell

• maintains homeostasis

• fully permeable

Why will an animal cell that is surrounded by fresh water burst?

• water will move out of the cell where there is a lower solute concentration causing the cell to shrink and be dehydrated

• water will move into the cell where there is a higher solute concentration causing the cell to be turgid and eventually lyse

• water will move out of the cell where there is a higher solute concentration causing the cell to shrink and be dehydrated

• water will move into the cell where there is a lower solute concentration causing the cell to be turgid and eventually lyse

The channels and pumps that are located in the cell membrane made of ________.

Answer explanation

Proteins

___________ is the maintenance of a steady internal environment.

Why is more water moving out of the cell than into the cell in the figure below?

• this is a hypertonic solution that is drawing the water out

• this is a hypotonic solution that is drawing the water in

• this is a hypertonic solution that is drawing the water in

• this is a hypotonic solution that is drawing the water out

Define osmosis.

• the diffusion of water from an area of high concentration to low concentration

• the diffusion of molecules from an area of low concentration to high concentration

• the diffusion of water from an area of low concentration to high concentration

• the diffusion of molecules from an area of high concentration to low concentration

Answer explanation

Diffusion of water from an area of high concentration to an area of low concentration

How is the plasma membrane organized?

• Into rows of proteins

• Into polar molecules

• Into a phospholipid bilayer

• Into rows of nonpolar lipids

__________ is the term for a plant cell that was placed in a concentrated sugar solution and their cytoplasm and cell membrane shrank and pulled away from the cell walls?

Define turgid.

• the state of being shrunken due to lack of fluid content

• the state of being swollen due to high fluid content

• the state of being swollen due to lack of fluid content

• the state of being shrunken due to lack of fluid content

________ _________ can pass directly through the cell membrane.

Answer explanation

nonpolar molecules