biological molecules

Question 1

in hot temperatures elephants spray themselves. explain why this acts as a cooling mechanism (3)

Answer 1

as water evaporates from surface of elephants body
some of elephants heat energy is used to break hyd bonds which holds water molecules together
this cools surface of elephantss body

Question 2

state the function of glycogen and explain how the structure of glycogen is linked to its function (3)

Answer 2

• glycogen is a polysaccharide of alpha - glucose which is used to store excess glucose in animals
• it has a branched structure meaning glucose can be released quickly
• its also a very compact molecule so its good for storage

Question 3

state 5 properties of water that make it useful for living organisms

Answer 3

• hyd bonds = high SHC
• hyd bonds = high LH of evaporation
• its polarity = very cohesive
• its polarity = good solvent
• less dense when solid ( ice)