A scientist compares four mixtures during genetic engineering. The gene is intact in every mixture.
Table
| Mixture | Gene and vector ends complementary | Active ligase present |
|---|---|---|
| P | yes | yes |
| Q | yes | no |
| R | no | yes |
| S | no | no |
Which pair of changes would make both Q and R suitable for forming the intended recombinant vector?
Add more gene to Q; add more ligase to R.
Add ligase to Q; prepare complementary ends for R.
Add more vector to R; add more gene to Q.
Add ligase to R; prepare complementary ends for Q.
44 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.