Jamb Biology Past Questions and Answers

Question 271:

• JAMB 1982

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

Question 272:

• JAMB 1982

ONE of the major causes of haemophilia is lack of

A. Firbrinogen
B. Amylase
C. White blood corpuscles
D. Red blood corpuscles
E. Plasma

Question 273:

• JAMB 1982

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

Question 274:

• JAMB 1982

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

Question 275:

• JAMB 1982

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