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1.1 Cell structure

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Question 12

Scientists investigated two previously unknown single-celled organisms, P and Q.

Prepared samples were examined using a light microscope and an electron microscope.

MicroscopeMagnification usedResolutionObservations of organism PObservations of organism Q
Light microscope×1500200 nmThe whole cell and a nucleus were visible.The whole cell was visible, but no nucleus or other internal structures were visible.
Electron microscope×300 0000.5 nmRibosomes and fine detail inside mitochondria were visible.Ribosomes, plasmids and a single loop of DNA lying free in the cytoplasm were visible. No membrane-bound organelles were visible.

Explain how the evidence from the electron microscope develops scientists' understanding of organisms P and Q beyond the evidence from the light microscope. Include the type of cell that makes up each organism.

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Markscheme

1.1 Cell structure Questions

  1. GCSE
  2. /Biology
  3. /1.1 Cell structure

282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.

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