Cell Transport

Question 1

Cell membrane is ___ ___ allowing some molecules to move across the membrane through __ ____ but preventing others. It is freely permeable to __, ___ molecules and ___ but impermeable to large insoluble molecules (eg____)

Answer 1

1 - selectively permeable 
2 - tiny pores 
3 - small soluble 
5 - water 
6 - starch

Question 2

The structure of the cell membrane (fluid mosaic model)

Answer 2

Is made up of proteins and lipids

Question 3

What is diffusion

Answer 3

The movement of substances from a region of high to low concentration along a concentration gradient until they are evenly dispersed

Question 4

A concentration exists when

Answer 4

There is a difference in the quantity of liquid or gas molecules

Question 5

Diffusion occurs

Answer 5

Down the concentration gradient

Question 6

What substances enter the cell by diffusion?

Answer 6

Useful substances (glucose, oxygen, amino acids, fatty acids)

Question 7

What substances leave the cell by diffusion

Answer 7

Waste - carbon dioxide and waste products

Question 8

The importance of diffusion to cells

Answer 8

To gain raw materials for respiration and photosynthesis and to remove waste products

Question 9

Examples of diffusion in multicellular organisms

Answer 9

Lungs - oxygen diffuses from air sacs into blood, co2 diffuses from blood to air sad
Small intestine - small soluble molecules diffuse access Vili I to blood