7. When using restriction enzymes to cut the DNA into segments, it is
essential to use

Answergoing for a brief walk ahead of time and stretching afterward;

It doesn't state that he washed his hands before or after preparing this poultry. even though he had it in seperate bags the bacteria from the poultry could have entered the vegtables because of a lack of handwashing. so cross-contamination is a very possible answer.   

What are the vocabulary words?