Organisation

Question 1

Explain why iodine solution remained blue-black in investigation for breakdown of starch at 80 Celsius

Answer 1

Enzymes becomes denatured
So starch is not broken down

Question 2

Why could blockage in the coronary artery cause cells in the heart to die

Answer 2

Less blood flows to the heart
So less oxygen reaches heart muscle

Question 3

Which part of blood starts the blood clotting process

Answer 3

Platelets

Question 4

Amylase is a polymer of smaller molecules
Name the type of smaller molecule

Answer 4

Amino acids

Question 5

Explain how Amylase breaks down starch in terms of lock and key theory.

Answer 5

Starch binds to active site of the enzyme
As the shape of the active site and substrate are complementary
So bonds between starch molecules are broken to produce smaller molecules (sugars/maltose)

Question 6

Explain the results of the enzymes at 5 and 80 Celsius
(At 5 and 80 the iodine solution does not become yellow-brown)

Answer 6

Iodine is not yellow brown as starch has not been broken down
At 5 Celsius amylases has low energy
So fewer enzyme substrate collisions
At 80 Celsius the amylase has been denatured
So starch is no longer complementary so can no longer bind and fit