Transportation 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

Question 2

How can the rate of diffusion be affected?

Answer 2

The concentration gradient
The temperature
The surface area of the cell membrane separating the different regions

Question 3

Concentration gradient in diffusion

Answer 3

The greater the difference in concentration, the quicker, the rate of diffusion

Question 4

The temperature in diffusion

Answer 4

The higher the temperature, the more kinetic energy of the particles will have said they will move and mix more quickly

Question 5

The surface area in diffusion

Answer 5

The greater the surface area, the force of the rate of diffusion

Question 6

Do bigger or smaller objects have a larger surface area to volume ratio.

Answer 6

Smaller objects

Question 7

What do large organisms have to help with their small surface area to volume ratio?

Answer 7

Mechanisms to increase surface area, proportionally such as additional absorbing areas or adaptions of shape
Have transport systems such as the circulatory system

Question 8

What is osmosis?

Answer 8

The diffusion of water molecules from region of higher water concentration to a region of lower water concentration through a partially permeable membrane

Question 9

Higher sugar concentration means.. (osmosis)

Answer 9

Lower water concentration

Question 10

What molecules can pass through a partially permeable membrane?

Answer 10

Irons, sugars and amino acids

Question 11

What is active transport?

Answer 11

Substances are transported passively down the concentration gradient
Substances have moved from a low to a high concentration - against the concentration gradient
Requires energy