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1.1 Cell structure

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Question 21

A scientist counted mitochondria and ribosomes in equal areas of cytoplasm in electron microscope images of three types of muscle cell. The scientist also measured the mean maximum contraction rate of each type of cell.

Type of muscle cellMean number of mitochondriaMean number of ribosomesMean maximum contraction rate in contractions per minute
P2831038
Q830012
R279537

A student concluded that the number of mitochondria has a greater effect on contraction rate than the number of ribosomes.

Evaluate the student's conclusion.

[4]
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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