Biological molecules

Question 1

What is ‘latent heat of vaporisation’?

Answer 1

The amount of energy needed to change one gram of liquid substance to gas

Question 2

What is ‘specific heat capacity’?

Answer 2

The amount of heat one kilogram of a substance must absorb to lose or change its temperature by 1°C

Question 3

Why is water a good solvent?

Answer 3

Ions and polar molecules can easily dissolve in it

Question 4

What does cohesion produce?

Answer 4

Surface tension (where water meets air)

Question 5

What are saturated fatty acids?

Answer 5

Molecules where the number of hydrogen atoms attached to the carbon skeleton is maximised

Only single bonds

Question 6

What are unsaturated fatty acids?

Answer 6

Have 1+ double bond that kinks the carbon chain (can’t pack tightly)

Question 7

What state are saturated fats in at toom temperature?

Answer 7

Solid

Question 8

What state are unsaturated fats in at toom temperature?

Answer 8

Liquid

Question 9

How many amino acids are common in all organisms?

Answer 9

20

Question 10

How many essential amino acids are there?

Answer 10

9

Question 11

What are the roles of lipids in living organisms?

Answer 11

• Protection
• Steroid hormones
• Phospholipid bilayer
• Buoyancy
• Insulation