Question 5
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- What is ageing? [2 marks]
- State four signs of ageing.[4 marks]
- State four characteristics of enzymes. [4 marks]
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:
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- Definition of ageing
- Is the process of growing old.
- Which begins from conception and terminates at death /at the end of one’s life.
- 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
- Definition of ageing
- 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