Bacteria were mixed with plasmids that contain a gene for resistance to antibiotic P. Only some of the bacteria took up a plasmid. The bacteria were then spread onto two agar plates. Plate 1 contained no antibiotic. Plate 2 contained antibiotic P. Which result would be expected?
Colonies grow on plate 1 only, and no colonies grow on plate 2.
Colonies grow on both plates, with fewer colonies on plate 2.
Colonies grow on plate 2 only, and no colonies grow on plate 1.
The same number of colonies grows on both of the two plates.
127 exam-style questions on OCR GCSE Biology 6.2 Feeding the human race, covering 6.2.1 Biological factors affecting food security, 6.2.2 Agricultural solutions to growing demand, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, 6.2.5 Steps in genetic engineering, 6.2.6 Benefits and risks of gene technology in agriculture, and 6.2.7 Biotechnological solutions to growing demand. Each one has a worked solution and a mark scheme showing where the marks go.