Need help explaining these three please rated

The enzyme Chymotrypsin can bind to proflavins with a Kd of 10-4M-1. The rate constant for the binding process is 108 M-151. What would be the rate constant for the dissociation process? Uracil replacement O 3 poly A tail O RNA splicing 5' methyl-GTP cap mRNA is heavily processed before translation. We discussed three types of mRNA processing. Which of the following is not one of them? splicing Uracil replacement 5' methyl-GTP cap O 3' poly A tail A mutagenesis-based method is commonly used as the first-in-line strategy for understanding the structure-function relationship of proteins, what is the name of this method? Alanine replacing Alanine screening Alanine muting Alanine scanning