MDCAT Pakistan · Biology

Quantitative Biology and Genetics Problems

28 practice questions, each with the answer and an explanation.

Practise Quantitative Biology and Genetics Problems now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 28 questions

  1. In a double-stranded DNA sample 30% of the bases are adenine. What percentage are guanine?
  2. A coding region of mRNA is 150 nucleotides long including the stop codon. How many amino acids are in the finished polypeptide?
  3. Two heterozygous parents (Aa × Aa) have two children. What is the probability that the first child is recessive and the second shows the dominant trait?
  4. A cell has an image length of 40 mm under a microscope magnification of ×500. What is its actual length in micrometres?
  5. A heart beats 80 times per minute and pumps 70 cm³ of blood per beat. What is its cardiac output in dm³ per minute?
  6. In a population in Hardy–Weinberg equilibrium, 4/25 of individuals show a recessive trait. What proportion are heterozygous carriers?
  7. In a double-stranded DNA sample 26% of the bases are adenine. What percentage are guanine?
  8. A short DNA segment has 5 A–T base pairs and 14 G–C base pairs. How many hydrogen bonds hold the two strands together?
  9. A cell has an image length of 40 mm under a microscope magnification of ×400. What is its actual length in micrometres?
  10. A heart beats 70 times per minute and pumps 80 cm³ of blood per beat. What is its cardiac output in dm³ per minute?
  11. In a double-stranded DNA sample 20% of the bases are adenine. What percentage are guanine?
  12. A short DNA segment has 9 A–T base pairs and 30 G–C base pairs. How many hydrogen bonds hold the two strands together?
  13. A coding region of mRNA is 30 nucleotides long including the stop codon. How many amino acids are in the finished polypeptide?
  14. A cell has an image length of 60 mm under a microscope magnification of ×400. What is its actual length in micrometres?
  15. What is the surface-area-to-volume ratio of a cube with sides of 2 cm?
  16. A heart beats 72 times per minute and pumps 70 cm³ of blood per beat. What is its cardiac output in dm³ per minute?
  17. In a double-stranded DNA sample 32% of the bases are adenine. What percentage are guanine?
  18. A short DNA segment has 30 A–T base pairs and 7 G–C base pairs. How many hydrogen bonds hold the two strands together?
  19. A coding region of mRNA is 300 nucleotides long including the stop codon. How many amino acids are in the finished polypeptide?
  20. A cell has an image length of 60 mm under a microscope magnification of ×200. What is its actual length in micrometres?
  21. What is the surface-area-to-volume ratio of a cube with sides of 5 cm?
  22. A heart beats 72 times per minute and pumps 80 cm³ of blood per beat. What is its cardiac output in dm³ per minute?
  23. In a population in Hardy–Weinberg equilibrium, 1/100 of individuals show a recessive trait. What proportion are heterozygous carriers?
  24. In a double-stranded DNA sample 28% of the bases are adenine. What percentage are guanine?
  25. A short DNA segment has 7 A–T base pairs and 30 G–C base pairs. How many hydrogen bonds hold the two strands together?
  26. A dihybrid cross AaBb × AaBb gives 48 offspring. How many are expected to show both recessive traits?
  27. In a population in Hardy–Weinberg equilibrium, 9/25 of individuals show a recessive trait. What proportion are heterozygous carriers?
  28. In a double-stranded DNA sample 35% of the bases are adenine. What percentage are guanine?

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