Transport in Cells

Question 1

What is diffusion

Answer 1

diffusion is the movement of particles from an area of high concentration to an area of low concentration until all particles are evenly distributed

Question 2

Which form of matter does diffusion takes place in

Answer 2

liquids and gases

Question 3

What is osmosis

Answer 3

It is the movement of water molecules from an area of high Concentration to an area of low concentration across a semi-permeable membrane.

Question 4

What is a semi premable membrane

Answer 4

A semi-permeable membrane is a membrane that has tiny holes in it which allows small molecules to pass through it but not larger molecules.

Question 5

what is a solution?

Answer 5

• A solution is a mixture of two substances called the solute and solvent.

A solution consists of two parts: the solute and the solvent.

Question 6

Difference between a solute and solvent

Answer 6

The solute is a substance that dissolves in another substance.

The solvent is a liquid that can dissolve other substances. The universal solvent is water.

Question 7

What is a Hypotonic Solution

Answer 7

A solution containing more solvent than solute. It is a dilute solution.

• Endosmosis takes place for cells in hypotonic solutions (water enters the cell.)

Question 8

What is a Hypertonic Solution

Answer 8

A solution containing more solute than solvent. It is a concentrated solution.

Exosmosis takes place for cells in hypertonic solutions (water leaves the cell by osmosis.)

Question 9

What is an isotonic Solution

Answer 9

• A solution containing the same concentration of solutes and solvent as the cells that are placed in it.

Water molecules move into an out of the cell at the same rate causing any cell placed in an isotonic solution to retain its normal.

Question 10

What is Active Transport

Answer 10

Active transport is the movement of particle from a low concentration to on area of high concentration.
It is placed into a carrier protein where energy is used to push the particle against
the concentration gradient (opposite to diffusion).

Question 11

Biological Examples of Active Transport

Answer 11

Mineral salts move across the cell membrane from the soil into the roof hair cell against the concentration gradient.

Glucose moves back into the blood by active transport (otherwise it would be excreted in urine.)