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Biology JAMB Past Questions

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271
The character-producing factors in living organisms are
  • A. Chromomeres
  • B. Alleles
  • C. Chromatids
  • D. Chromosomes
  • E. Genes
View Answer & Discuss (4) JAMB 1984
272
A mixture of mercurous and mercuric nitrates is added to a food substance. A white precipitates is formed which on gentle heating turns red. The food substance is
  • A. Protein
  • B. Oil
  • C. Carbohydrates
  • D. Fat
  • E. Fatty acid
View Answer & Discuss (6) JAMB 1984
273
The mammalian organ through which nourishment and oxygen diffuse into a developing embryo is called
  • A. Amnion
  • B. Chorion
  • C. Umbilical cord
  • D. Oviduct
  • E. Placenta
View Answer & Discuss (3) JAMB 1984
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274

Osmosis can be defined as the movement of

  • A. Molecules from solution of higher concentration to low concentration
  • B. Molecules from solution of low concentration to high concentration
  • C. Water from solution of high concentration to low concentration
  • D. Water across a semi-permeable membrane from solution of low concentration to high concentration
  • E. Water across a semi-permeable membrane from solution of high concentration to low concentration
View Answer & Discuss (45) JAMB 1984
275
Which of the following statement is NOT true of enzymes? They
  • A. Are proteins
  • B. Need cofactors to activate them
  • C. Are sensitive in their action
  • D. Are specific in their action
  • E. Can withstand high temperature
View Answer & Discuss (7) JAMB 1984
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