2c

Question 1

Decomposition of proteins

Answer 1

Protein —(protease)—> Amino acids

Question 2

Enzymes

Answer 2

Biological catalysts in metabolic reactions

Question 3

Test for glucose

Answer 3

• Benedicts solution turns from blue to brick red.
  1. Add sample and water to test tube.
  2. Mix.
  3. Add bendicts solution.
  4. Leave in water bath.

Question 4

Test for proteins

Answer 4

• Biruet solutions (potassium hydroxide and copper sulphate) goes from blue to purple.
• Add sample to biruet

Question 5

Test for lipids

Answer 5

Ethanol and water solution goes from colourless to white/cloudy
1. Add sample and ethanol to test tube.
2. Mix.
3. Add solution to a test tube with cold wter.

Question 6

Effect of pH on enzymes

Answer 6

If enzymes are not at their optimum pH they will become denatured.

Question 7

Denatured

Answer 7

There has been a change in the active site of an enzyme

Question 8

Effect of temperature on enzymes

Answer 8

Optimum temperature for enzymes is 37ºC (body temperature).
At cold temperatures, enzymes have little kinetic energy, the enzyme doesen’t collide.
At high temperatures, the enzymes get denatured(destroyed), their shape is changed.

Question 9

Decomposition of starch

Answer 9

Starch —(amylase)—> Maltose —(maltease)—> Glucose

Question 10

Decomposition of lipids

Answer 10

Lipids —(lipase)—> Fatty acids and glycerol