Question

name: passive transport practice

1. the cell membrane is made of a
2. the cell membrane is permeable. this means that
3. diffusion always causes particles to move from a region of concentration to a region of concentration.
4. does a cell use energy when molecules diffuse in or out of the cell?
5. what are 3 types of passive transport?

look at the diagrams. the black dots represent solute molecules dissolved in water

1. in which beaker is the concentration of solute the greatest? a or b

write the correct type of solution underneath (isotonic, hypertonic, or hypotonic)

1. tonic means there is a greater concentration of solute molecules outside the cell than inside.
2. tonic means there is a lower concentration of solute molecules outside the cell than inside.
3. tonic means there is the same concentration of solute molecules outside the cell as inside.

show the direction the molecules are moving with arrows

1. h₂o h₂o
2. salt h₂o salt h₂o
3. when water molecules move across a membrane, what is this process called?

Explanation:

1. The cell - membrane is made of a phospholipid bilayer.
2. It is semi - permeable, allowing certain substances to pass through while blocking others.
3. Diffusion moves particles from high to low concentration.
4. No energy is used in simple diffusion.
5. Three types of passive transport are diffusion, osmosis, and facilitated diffusion.
6. Beaker A has a higher solute concentration as there are more solute particles.
7. Hypertonic means more solute outside the cell.
8. Hypotonic means less solute outside the cell.
9. Isotonic means equal solute concentration inside and outside the cell.
10. Water will move into the cell if there is a higher solute concentration inside (osmosis).
11. Water will move out of the cell if there is a higher solute concentration outside.
12. The movement of water molecules across a membrane is called osmosis.

Answer:

1. Phospholipid bilayer
2. Semi - permeable; only certain substances can pass through
3. High; low
4. No
5. Diffusion, osmosis, facilitated diffusion
6. A
7. Hyper
8. Hypo
9. Iso
10. Arrows should point into the cell if solute concentration is higher inside
11. Arrows should point out of the cell if solute concentration is higher outside
12. Osmosis