A scientist must choose a restriction enzyme to open a circular vector once and remove a complete donor gene. Each enzyme produces compatible sticky ends in the two DNA samples.
Table
| Enzyme | Cuts in vector | Cuts inside required gene | Cuts on each side of required gene |
|---|---|---|---|
| P | 1 | 0 | yes |
| Q | 1 | 1 | yes |
| R | 0 | 0 | yes |
| S | 1 | 0 | no |
Which enzyme meets all of the requirements?
S
R
Q
P
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.