Biology 9700 · AS & A Level · Cells as the basic units of living organisms

Cells as the basic units of living organisms — practice question

The gene responsible for coding protein R has a length of 130 kb. The mass of protein R is 220 kDa. A typical amino acid has a mass of 110 Da. (1000 base pairs = 1 kb, 1000 Da = 1 kDa) Which row is correct?

  • Aapproximate length of introns in this gene / base pairs: 6000; approximate length of mRNA for this gene / base pairs: 6000
  • Bapproximate length of introns in this gene / base pairs: 6000; approximate length of mRNA for this gene / base pairs: 130000
  • Capproximate length of introns in this gene / base pairs: 124000; approximate length of mRNA for this gene / base pairs: 6000
  • Dapproximate length of introns in this gene / base pairs: 124000; approximate length of mRNA for this gene / base pairs: 130000

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI