13. In some bacterial strains, certain genes exist in the genome but are typically not expressed. These genes are known as silent or cryptic. It is of great interest to artificially turn on the expression of these genes to determine their function in their native organism. Since many of these bacteria cannot maintain episomal plasmids, it is difficult and often impossible to artificially express these genes via plasmid overexpression. As a result, promoter replacement must be performed at the chromosomal level. Here, you need to devise an approach to replace an otherwise silent promoter with a new constitutive promoter on the genome, leaving as little trace behind as possible. The approach needs to allow you to identify clones that have received the new promoter. a. List all genetic components required for this process, including genes encoding for any enzymes needed. (3 points) b. Give a detailed description of the promoter replacement process. (7 points)