Scientists prepare a plasmid vector to transfer a gene for salt tolerance into recipient cells. The plasmid originally contains 6000 base pairs. Restriction enzymes remove a section of 1500 base pairs, and DNA ligase joins a gene fragment containing 500 base pairs into the gap.
By what percentage is the recombinant plasmid shorter than the original plasmid?
16.7%16.7\%16.7%
25%25\%25%
8.3%8.3\%8.3%
20%20\%20%
100 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.