3.1.7 Water

Question 1

Water is a ______________ molecule

Answer 1

Dipolar

Question 2

Metabolite

Answer 2

Condensation and hydrolysis, metabolic reactions

Question 3

Solvent

Answer 3

Allows metabolic reactions to occur and transport of substances

Question 4

High specific heat capacity

Answer 4

Buffers change in temperature so core body temperature can be maintained

Question 5

Large latent heat of vaporisation

Answer 5

Provides cooling effect through evaporation, lots of energy is taken out of the body

Question 6

Cohesion

Answer 6

Provides surface tension which supports small organisms and forms continuous columns of water which travel up xylem vessels

Question 7

Water and inorganic ions have important biological functions within cells.

Give two properties of water that are important in the cytoplasm of cells.

For each property of water, explain it’s importance in the cytoplasm (4)

Answer 7

1. Polar molecule;
2. Acts as (universal) solvent;

OR

3. (Universal) solvent;
4. (Metabolic) reactions occur faster in solution;

OR

5. Reactive;
6. Takes place in hydrolysis/condensation/named reaction;

Question 8

Other than sodium, name one inorganic ions and give one example of its biological importance in a cell (2)

Answer 8

Name of ion;

Correct function within cells;