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Home⇒ Medical Science⇒ Biochemistry⇒ Transcription and regulation
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Transcription by E. coli polymerase occurs in three phases known as initiation, elongation and termination [other wrong options] [Discuss in forum] ![]() ![]() four phases known as initiation, propagation, elongation and termination two phases known as initiation and termination none of the above |
Q2 ⇒ Transcription factors are proteins which bind to DNA and regulate transcription [other wrong options] [Discuss in forum] ![]() ![]() promoters TATA boxes CATT boxes |
Q3 ⇒ Transcription begins upstream from the start codon [other wrong options] [Discuss in forum] ![]() ![]() at the start codon downstream from the start codon none of these |
Q4 ⇒ The regions of a gene located at -10 and -35, with respect to the start of transcription, are termed promoters. [other wrong options] [Discuss in forum] ![]() ![]() start codons. oriC regions. Shine Dalgarno sequences. |
Q5 ⇒ The binding of lac repressor to DNA could be considered to be analogous to competitive inhibition of an enzyme [other wrong options] [Discuss in forum] ![]() ![]() mixed-type inhibition of an enzyme uncompetitive inhibition of an enzyme allosteric effects in enzyme regulation |
Q6 ⇒ Which of the following is necessary for transcription to occur? Both DNA & RNA polymerase [other wrong options] [Discuss in forum] ![]() ![]() DNA molecule RNA polymerase DNA polymerase |
Q7 ⇒ In both eukaryotes and prokaryotes, a promoter region that is rich in AT bases is called as TATA box [other wrong options] [Discuss in forum] ![]() ![]() CATT Shine Dalgarno region SV40 region |
Q8 ⇒ The major function of RNA polymerase's sigma factor is recognition of the transcriptional start sequence [other wrong options] [Discuss in forum] ![]() ![]() recognition of the translational stop sequence recognition of the transcriptional stop sequence recognition of the translational start sequence |
Q9 ⇒ The nucleons of eukaryotic cell has all of these [other wrong options] [Discuss in forum] ![]() ![]() RNA polymerase I RNA polymerase II RNA polymerase III |
Q10 ⇒ Transcription results in messenger RNA [other wrong options] [Discuss in forum] ![]() ![]() an amino acid chain complementary DNA Okazaki fragments |
Q11 ⇒ Which of the following conditions would cause the release of the lac repressor protein from the lac operator site on DNA? Both (b) and (c) [other wrong options] [Discuss in forum] ![]() ![]() Presence of glucose in the growth media Presence of lactose in the growth media Presence of IPTG (isopropyl thiogalactoside) in the growth media |
Q12 ⇒ RNA polymerase in prokaryotes has a removable sigma subunit [other wrong options] [Discuss in forum] ![]() ![]() alpha subunit beta subunit both (a) and (b) |
Q13 ⇒ What is a promoter? A specific sequence of DNA to which RNA polymerase binds [other wrong options] [Discuss in forum] ![]() ![]() A specific sequence of DNA to which a catabolic repressor binds A specific DNA sequence to which a restriction endonuclease binds None of the above |
Q14 ⇒ In prokaryotes, transcription is terminated by a protein called rho [other wrong options] [Discuss in forum] ![]() ![]() terminated by the stop codon terminated by a poly A sequence terminated by a start codon |
Q15 ⇒ Enhancers are regions that modulate transcription [other wrong options] [Discuss in forum] ![]() ![]() bind RNA polymerase are adjacent to the TATA box are CAT box binding proteins |
Q16 ⇒ Immediately after transcription a methylated guanine cap is added to the 51 end of the transcript [other wrong options] [Discuss in forum] ![]() ![]() a methylated guanine cap is added to the 31 end of the transcript both (a) and (b) a poly adenylation signal is added |
Q17 ⇒ The closed complex at bacterial promoters is in equilibrium with free RNA polymerase and the promoter [other wrong options] [Discuss in forum] ![]() ![]() not affected by promoter mutations bound more tightly when repressors are present not affected by activator proteins |
Q18 ⇒ Transcription of each set of rRNA genes by RNA polymerasel produces a single 45S rRNA precursor molecule [other wrong options] [Discuss in forum] ![]() ![]() a single 5S rRNA precursor molecule a single 18S rRNA precursor molecule a single 28S rRNA precursor molecule |
Q19 ⇒ The complex of RNA polymerase, DNA template and new RNA transcript is called transcription bubble [other wrong options] [Discuss in forum] ![]() ![]() replication bubble a translation bubble none of these |
Q20 ⇒ Each tRNA molecule has a cloverleaf secondary structure consisting of three stem loops [other wrong options] [Discuss in forum] ![]() ![]() two stem loops four stem loops either (a) or (b) |
Or |