Question

which of the following regarding th sigma factor of E.coil RNA polymerase is correct?

a) is required for termination of an RNA chain

b is inseparable from the core enzyme

c) will analyse synthesis of RNA from both strands of the DNA template in the absence of the

d) combines the core enzyme to confer specific binding to a promoter

q2

which of the following is not true of all naturally occurring DNA

1) two hydrogen bonds from A and T

b)the two complementary strands are antiparallel

c the amount of A always equals the amount of T

d) deoxyribose units are connected by 3',5'-phosphodiester bonds

e) the ratio A+T/G+C is constant for all natural DNAs

Answer 1

O option d es correct:factor isigma factor) : binds to the :: core enzyme and provides :specificity for promoter recognition. cuinen & factor binds to RNA: : polymerase core emyne is ho lo emyme :formo. . Sigma factor discociates . from core enzyme after. Initiating ...transcription)........... ... Sigma Frectorie separable part of :: RNA palymerase. The termination. of transcription is helped by rho. :::64): factor. So option (d). is.. ...........0 .... s! Scanned wirect.................. CamScanner

In DNA : AT bind with double bonds and bic form triple bonds : The strands of DNA are antiparallel : to each other means one strand runs from is to :3! and other strand is ... opposite to it... The unito in DNA are connected by phosphodiester bonds. .. According to chargaft's rule. AT .GEC.and..A + G CtT.. Ratio of A+T usually differs it from species to species. So. ...... not constant . $0 : CS. Scanned option E is not correct. CamScanner Cast option is not correct).