Question

3. How does Ultra-Violet Light affect genes? The 4. Describe at least four characteristics of a plasmid? 5. Why may Serratia marcescens be red in color2 11.

Answer 1

3. How does Ulta -violet Light affect genes ? Armeer. Ultraviolet (ov) light ean killo cells by damaging their DNA she light initiates a reaction between two molecules of thymine, one of the fases that make up DNA ... - UV light exerts its mutagenie effect by exciting electrons in molecules. The excitation of electrons in DNA molecules offen results in the formation of expabonds led between adjacent Pyrimi- dines (specifically thy mene) in DNA which means on gene when two pyrimidines are bound together in this way, it is called a pyrimidine dimer which will disturb the gene expression Thus UV light affects gene 4. Descrife at least four charactisfie Charreferistees of a plasmids ? Annoes: 6 A plasmid in a small circular, double stranded, expachromosomal DNA molecules e wither a call that is physically seperated from Chrome somal DNA and can replicate independently . Plasmid can have a size ranging from 1 - 2008kb. W It carries functions advantageous to the host such as ; produce enzymes which degrades antibiotics or heavy metals

- They have an origin of replication, a selective markess as well as multiple cloning site as why may Serratia marces can be red en color? | Annon - Serratia marcescens was chosen because it was easily tracked due to its pigment production Serratia marcescens is well known for the red pigment that it produers called Prodigiosen . Prodigiosen is made up of three pyrrole ring and is produced at a temperature below 30°c but not at high temperature above 30%, resulting in a pale - off white color at that temperature