Biological molecules-water

Question 1

Role of Water in Biology?

Answer 1

 found in living organisms

 also acts as habitats for living organisms

Question 2

Properties of Water?

Answer 2

 Water Molecules (H20) are dipolar
 Hydrogen has slightly +ve charge and Oxygen has slightly -ve charge
 therefore H20 molecules can form hydrogen bonds with each other

Question 3

Properties

Answer 3

metabolite
Solvent
high specific heat capacity
large latent heat of vaporisation
strong cohesion

Question 4

Metabolite

Answer 4

Involved in condensation+hydrolysis

Question 5

High specific heat capacity

Answer 5

A lot of heat needs to be applied before it evaporates
Water doesn’t experience rapid temperature change
Good for habitat.

Question 6

Latent heat of vaporisation

Answer 6

A lot of energy needed to break hydrogen bonds.

Water loss through evaporation to cool down without loosing too much water

Question 7

Strong cohesion

Answer 7

Water when pressurised can provide a strong physical pushing force. Used
particularly in Mass Flow (where mass of water carries large amounts of substances e.g. tissue fluid in
capillaries and phloem in plants). Also helps to support turgidity in plants.