Question

answer all the questions

1) All of the following contribute to promoter binding by RNA polymerase I in bacteria except: a)-10 consensus sequence b)-35 consensus sequence c) rho factor d) sigma factor e) none of the above 2) Common structural changes or lesions found in DNA after exposure to ultraviolet light are: a) thymine dimers b) cytosine dimers c) purine dimers d) adenine dimers e) none of the above 3) What is the function of the sigma subunit in the RNA polymerase of the bacterium E. coli: 4) Which of the following is involved in the processing of mRNA precursors in eukaryotic cells? a) Methylation of the cap of the 5' end b) Addition of a poly U tail c) Retaining introns d) Forming a lariat structure c) Addition of a poly G tail 5) Describe at least two major intramolecular forces that help stabilize the DNA double-helix? 6) Define: euchromatin 7) Define: heterochromatin

Answer 1

bin in bacteria ding 1 © the factor Reason: RNA polymerase involues signa factor region sequence factor for recognizing the promoter and - 35 consensus contains gt - 10 consensus . 3) (a) Thymuine to DNA caue damage to Reason: lineas UV exposure by sytokito cyclobutone byssus eline Limeas. DNA most common are dimers Thymine foren mation (3) Sigono Subunit enables and identify bind to the holo enzyme to sites on DNA, speific sites op (4) (9) Methylation the cap of 51 end Reason capping at slend is first step in procening. MRNA CS$canned with CamScanner