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1.2 What happens in cells (and what do cells need)?

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Question 7

Alpha-amanitin is a toxin from the death cap mushroom (Amanita phalloides). This substance is a selective inhibitor of RNA polymerase II, stopping the transcription of DNA into messenger RNA (mRNA), while having no direct effect on translation machinery such as ribosomes.

a.

Describe how cells synthesize proteins starting from a gene in the DNA.

[4]
b.

Explain why exposure to alpha-amanitin does not immediately cause all protein synthesis to cease, but does cause it to stop completely over a longer period.

[3]
c.

Explain how the molecular structure of a gene determines the specific primary structure of the protein produced.

[4]
Markscheme

1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

72 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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