What is the primary role of DnaB in DNA replication?a) To form phosphodiester bonds between nucleotides b) To repair DNA damage c) To break hydrogen bonds and separate DNA strands d) To proofread newly synthesized DNA strandsAccording to DNA Replication Rule 1, in which direction does DNA synthesis occur?a) From the 3' to the 5' end b) From the 5' to the 3' end c) Bidirectionally d) From the 3' to the 5' end on one strand and from the 5' to the 3' end on the other strandWhat is the primary function of Single-Stranded Binding (SSb) proteins during DNA replication?a) To unwind the DNA double helix b) To join Okazaki fragments c) To stabilize and protect single-stranded DNA d) To proofread newly synthesized DNA strands9-mer has how many nucleotides?a.5b.4c.9d.10If two DNA strands were aligned in parallel, the charges of complementary nucleotides would attract each other. (True/False)Which of the following statements accurately describes the structural difference between pyrimidines and purines?a) Pyrimidines consist of two rings, while purines have a single ring..b) Pyrimidines consist of a single ring, while purines have two rings..c) Pyrimidines consist of three rings, while purines have a single ring..d) Pyrimidines consist of a single ring, while purines have three rings.What is the role of oriC in replication initiation in E. coli?a) Attracting DNA polymerasesb) Providing a site for DNA synthesisc) Binding replication-initiating enzymesd) Initiating replication terminationWhy is the antiparallel arrangement of the two strands of the DNA double helix essential?a) It prevents the formation of hydrogen bonds.b) It allows for the formation of stable hydrogen bonds.c) It disrupts the alignment of nucleotides.d) It promotes the repulsion of complementary nucleotides.What is the initial action of DnaA during DNA replication initiation in E. coli?a) Binding to the 13-mer sequences b) Initiating DNA synthesis c) Breaking phosphodiester bonds d) Binding to the 9-mer sequences, bending the DNA, and breaking hydrogen bonds in the 13-mer regionWhat is the sequential process of DNA replication initiation in E. coli involving DnaA, DnaC, and DnaB?a) DnaA binds to the 9-mer region, followed by DnaC delivering DnaB to form the open complex. b) DnaB binds to the 9-mer region, followed by DnaC delivering DnaA to form the open complex. c) DnaA binds to the 9-mer region, forcing unwinding of the 13-mer region to form the open complex, then DnaC delivers DnaB to initiate helicase activity. d) DnaC binds to the 9-mer region, forcing unwinding of the 13-mer region to form the open complex, then DnaA delivers DnaB to initiate helicase activity.Under dehydrating conditions, Rosalind Franklin showed that DNA is driven into which form?a) B formb) Z formc) A formd) C formJohn Cairns reported the first evidence of bacterial origins of replication in 1963. (True/False)Which term describes the large complex aggregations of proteins and enzymes involved in DNA replication?a) Replication bubblesb) Replication forksc) Replisomesd) DNA polymerasesAccording to Chargaff's Rule, what is the ratio of pyrimidine and purine bases in DNA?a) 2:1b) 1:2c) 1:1d) 3:1Who proposed the semi-conservative model of DNA replication?a) Watson and Crickb) Blockc) Delbrückd) FranklinDNA replication is identical among Bacteria, Archaea, and Eukarya. (True/False)Which enzymes are involved in the initiation of DNA replication at oriC in E. coli?a) DNA polymerasesb) DNA ligasesc) DnaA, DnaB, and DnaCd) HelicasesReplisomes assemble at each replication bubble during DNA replication. (True/False)What is the capability of cesium chloride (CsCl) centrifugation in separating molecules?a) Separating molecules based on size.b) Separating molecules based on charge.c) Separating molecules with slightly different molecular weights.d) Separating molecules based on their polarity.Which scientist proposed the conservative model of DNA replication?a) Watson and Crickb) Blockc) Delbrückd) Hershey and Chase
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