Water

Question 1

How do hydrogen bonds occur between water molecules

Answer 1

Water is polar molecule

Slightly negatively charged oxygen atoms attract slightly positively charged hydrogen atoms of other water molecules

Question 2

Properties of water that are important in biology

Answer 2

Metabolite

Solvent

High SHC

High latent heat of vaporisation

Strong cohesion between water molecules

Question 3

Importance of water being a metabolite in biology

Answer 3

Used in condensation/hydrolysis reactions

Question 4

Importance of water being a solvent in biology

Answer 4

Allows metabolic reactions to occur

Allows transport of substances

Question 5

Importance of water having a high SHC

Answer 5

Buffers changes in temperature

As can gain a lot of heat energy without changing temperature

Good habitat for aquatic organisms as temperature more stable than land

Helps organisms maintain a constant internal body temperature

Question 6

Importance of water having a high latent heat of vaporisation

Answer 6

Allows effective cooling via evaporation of a small volume

So helps organisms maintain a constant internal body temperature

Question 7

Importance of water having strong cohesion between water molecules

Answer 7

Supports columns of water

Produces surface tension, supporting small organisms