YV4-Cells-Osmosis- Active Transport

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

Cells & Osmosis

Osmosis

Facilitated diffusion needs what to get particles from one side of the membrane to the other?

1. a membrane-spanning protein
2. a surface protein
3. a phospholipid
4. a carbohydrate

What is a difference between diffusion and facilitated diffusion?

1. movement of particles from [high] to [low]
2. a protein "helper"
3. movement of particles from [low] to [high]
4. energy

What does semi-permeable mean?

Which of the following processes includes all others?

1. osmosis
2. diffusion of a solute across a membrane
3. facilitated diffusion
4. passive transport

A single plant cell is placed in an isotonic solution. Salt is then added to the solution. Which of the following would occur as a result of the salt addition?

1. The added salt would enter the cell, causing the cell to take up water and swell.
2. Water would enter the cell by osmosis, and the cell would swell.
3. Water would leave the cell by osmosis, causing the volume of the cytoplasm to decrease.
4. There would be no osmotic movement of water in response to the added salt.

Cells & Osmosis

Active transport

Which diagram best shows the end result of diffusion?

1. F
2. G
3. H
4. J

Diffusion is the movement of molecules from an area of _____ concentration to an ______ concentration

1. high, low
2. high, high
3. low, high
4. low, low

Which is true for passive transport?

1. Moves from low to high concentration
2. Requires energy
3. Moves from high to low concentration
4. Moves against the gradient

If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?

1. The red blood cell would burst, and the plant cell would shrink.
2. Both cells would lose water; the red blood cell would shrivel, and the plant plasma membrane would pull away from the cell wall.
3. Both cells would gain water by osmosis; the red blood cell would burst, and the plant cell would increase in turgor pressure.
4. The red blood cell would shrink, and the plant cell would gain water.

Sodium potassium pump

Active transport

• The cell invests energy 
• Often against the concentration gradient 
• For example:

       -Pumps in the membrane
       -Endocytosis

02:58

Where will the water go?

1. A
2. B

04:53

Where is the higher solute concentration

1. hypothetical pure water IV
2. red blood cells

04:53

What are the red blood cells compared to the hypothetical pure water IV?

1. hypertonic
2. hypotonic

05:34

An animal cell placed in a hypertonic (salty) solution will:

1. shrink
2. swell
3. stay the same