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Cellular control

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Question 1

Which of the following statements describe(s) control of gene expression at the post-transcriptional level?

  1. Alternative splicing of pre-mRNA transcripts to produce different mature mRNA molecules.
  2. Cleavage of target mRNA by the RNA-induced silencing complex (RISC) guided by siRNA.
  3. Methylation of cytosine bases in CpG islands of DNA to repress transcription.
A

Only 1 and 3

B

1, 2 and 3

C

Only 1 and 2

D

Only 2

Markscheme

Cellular control Questions

  1. A Level
  2. /Biology
  3. /Cellular control

30 exam-style questions on OCR A A Level Biology Cellular control. Each one has a worked solution and a mark scheme showing where the marks go.

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