generate questions: Genetic engineering is now a routine research tool with model organisms. For example, genes are easily added to bacteria and lineages of knockout mice with a specific gene's function disrupted are used to investigate that gene's function. Many organisms have been genetically modified for applications in agriculture, industrial biotechnology, and medicine.
What has become a common research tool with model organisms? {sep_token} What do scientists explore by adding genes to mice with a certain gene's function disrupted? {sep_token} What is an application for which organisms have been modified for? {sep_token} What is another for which  organisms have been modified for? {sep_token} What is yet another application for which  organisms have been modified for? {sep_token}