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1.1 Cell structures

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Question 23

A culture vessel should contain only animal cells. A technician finds two cell populations in the vessel and analyses their genetic material.

Cell populationArrangement of main DNASeparate small circular DNA loops
PLong chromosomes enclosed by a membraneAbsent
QOne circular loop free in the cytoplasmPresent
a.

Explain which cell population is bacterial contamination.

[3]
b.

One of the small DNA loops in population Q carries a gene for resistance to an antibiotic. Cells from population Q are mixed with bacteria that do not carry this loop.

Predict how the resistance in the mixed population could change. Explain your answer.

[2]
Markscheme

1.1 Cell structures Questions

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

130 exam-style questions on OCR GCSE Biology 1.1 Cell structures, covering 1.1.1 Viewing cells with light microscopes, 1.1.2 Sub-cellular structures and functions, and 1.1.3 Electron microscopy and resolution. Each one has a worked solution and a mark scheme showing where the marks go.

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