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

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Question 5

Scientists investigate a gene being used to make a protein in cultured plant cells. They test the nucleus and cytoplasm for the DNA containing this gene and for the mRNA copied from the gene.

Location testedDNA containing the gene detectedmRNA copied from the gene detected
NucleusYesYes
CytoplasmNoYes
a.

Explain the different locations of the DNA and mRNA shown in the table.

[2]
b.

The scientists add a substance to a second group of cells before the cells begin to use this gene. The substance prevents mRNA from passing through nuclear pores but does not affect transcription, ribosomes or tRNA.

Explain the effect of the substance on the production of the protein coded for by this gene.

[3]
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)?

184 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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