EoY test Yr9 Review

Question 1

Name 2 pieces of labratory equipment the student could have used to prepare cells to view using the microscope.

Answer 1

Dye/Stain (Iodine)
Slide

Question 2

Describe two differences between aerobic and anaerobic respriration in humans. (Do not refer to oxygen in your answer)

Answer 2

Aerobic respiration RELEASES more energy than anaerobic respiration.
Anaerobic resiration produces lactic acid, Aerobic respiration does not.

Question 3

Amylase is an enzyme that breaks down starch. Amylase is a polymer of smaller molecules. Name the type of smaller molecules.

Answer 3

Amino Acids

Question 4

Explain how amylase breaks down starch, amswer in terms of ‘lock and key theory’

Answer 4

• starch / substrate binds to active site
• shape of active site and substrate are complementary
• a chemical reaction occurs to produce smaller molecules

Question 5

When writing control variables do you use volume or amound?

Answer 5

Volume

Question 6

Explain the results as 5 degrees C and 80 degrees C

Answer 6

• starch is still present or starch has not been broken down
• at 5 °C amylase / starch / molecules have low (kinetic) energy
• there are fewer (enzyme-substrate) collisions
  (allow fewer enzyme-substrate complexes are formed)
• at 80 °C the amylase has been denatured
• the starch can no longer fit