Observation

Candidates were able to explain ageing and state some signs of ageing. Some candidates could state only a few characteristics of enzymes.

The expected answers are:

1. 1. Definition of ageing
      • Is the process of growing old.
      • Which begins from conception and terminates at death /at the end of one’s life.
   2. Signs of ageing
      • loss of memory may occur
      • decreased physical power and prowess/ sluggish movement /weak body
      • hair become scanty /loss of hair/grey/white
      • changes in kidney function/bladder capacity
      • appearance of wrinkled skin/dry skin
      • structural changes occur at the bones/joints/ligament/stiffness at joints/ stooped posture
 
2. Characteristics of enzymes
   Enzymes:
   • are specific in action
   • remain unchanged at the end of the action/ act as catalysts in chemical reactions
   • are required in small quantity to act
   • actions are reversible
   • are pH specific
   • they are proteins in nature
   • are temperature specific