Biological molecules

Question 1

Identify the chemical elements present in carbohydrates

Answer 1

Carbon
Hydrogen
Oxygen
Simple carbohydrates are sugars

Question 2

Identify the chemical elements present in proteins

Answer 2

Amino acids containing:
Carbon
Hydrogen
Oxygen 
Nitrogen
Amino acids join together to make a chain

Question 3

Identify the chemical elements present in lipids

Answer 3

Carbon
Hydrogen
Oxygen
Glycerol molecule + fatty acid molecule

Question 4

Where are starch and glycogen from?

Answer 4

from simple sugars

Question 5

What are the roles of enzymes

Answer 5

Protein molecules
Biological catalysts
Speed up metabolic reactions

Question 6

How does temperature change affect enzymes?

Answer 6

Each enzyme has an ‘active site’

If it gets too hot, the enzyme is ‘denatured’

Question 7

How is enzyme function can be affected by changes in pH?

Answer 7

Most enzymes work best at pH7-8, this is their ‘optimum pH’
Rate of reaction is slower either side of the optimum pH
At wrong pH the shape of an enzymes active site is changed and it will not fit the substrate molecule
The enzyme is denatured