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Biology Past Questions and Answers

Biology Questions

Question 271:
In the enzyme (amlyase) reactions of starch → sugar
starch is referred to as the
  • A Substrate
  • B Product
  • C Enzyme
  • D Enzyme-substrate complex
  • E Reaction mixture
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Question 272:
ONE of the major causes of haemophilia is lack of
  • A Firbrinogen
  • B Amylase
  • C White blood corpuscles
  • D Red blood corpuscles
  • E Plasma
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Question 273:
In man, identical twins occur when
  • A An ovum is fertilized by a sperm and then divide into two, each forming a separate embryo
  • B An ovum fertilized by two sperms and then divides into two, each forming an embryo
  • C Two ova are fertilized at the same tine each forming an embryo
  • D Two ova are fertilized by a single sperm each forming an embryo after fertilization
  • E One ovum first divides into two and each half is fertilized by a sperm before developing into an embryo
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Question 274:
The parts of the mammalian eye that strongly bend light rays are the
  • A Cornea and the lens
  • B Cornea and aqueous humour
  • C Cornea and vitreous humour
  • D Lens and aqueous humour
  • E Lens and vitreous humour
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Question 275:
Which of these statements is NOT true of insects?
  • A They are anthropods
  • B Their body is divide into three distinct regions of head, thorax and abdomen
  • C Their thorax comprises three segments, only two of which bear a pair of appendages each
  • D Respiration is by means of trachea
  • E They undergo metamorphosis
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