MMSC490 Exam 2 Questions with 100% Correct

Although E. coli DNA polymerase I is not a chromosomal DNA replicase, it participates in DNA replication. What is its function? a. synthesizes Okazaki fragments b. replaces RNA primer with DNA c. unwinds the double helix d. synthesizes an RNA primer e. connects 3' end of one okazaki fragment with the 5' end of another - Answer ️️ -b. replaces RNA primer with DNA In a replication fork, how do leading and lagging strands differ? a. lagging strand is subject to more error and requires more repair b. lagging stand new DNA is synthesized 3' to 5' c. each strand is replicated by a unique type of polymerase d. lagging strand is replicated discontinuously e. DNA polymerase proceeds more slowly on lagging strand - Answer ️️ -d. lagging strand is replicated discontinuously In bacteria, mRNAs are... a. completely transcribed first then translated completely before being degraded b. transcribed and translated simultaneously c. completely transcribed first, then translated and degraded simultaneously d. transcribed, translated and degraded in different parts of cell e. transcribed and translated simultaneously, then later degraded - Answer ️️ -b. transcribed and translated simultaneously Combined sizes of prokaryotic and eukaryotic ribosomes are... a. the same b. 30s and 50s, respectively c. 40s and 60s respectively d. 70s and 80s, respectively - Answer ️️ -d. 70s and 80s, respectively Eukaryotic ribosomes recognize and initially bind to what structure on the mRNA? a. A shine-dalgarno sequence b. the 7-methylguanosine cap c. a TATA sequence d. a CCAAT sequence - Answer ️️ -b. the 7-methylguanosine cap Ribosome release factors are structurally similar to a. the EF-Tacyl-tRNA complex b. EF-G.C. c. tRNAs d. both the EF-Tacyl-tRNA complex and EF-G e. the EF-Tacyl-tRNA complex, EF-G and deacylated tRNAs - Answer ️️ -d. both the EF-Tacyl-tRNA complex and EF-G Primary function of factor EF-G is to a. convert EF-Tu.GDP to an active form b. allow binding of aminoacyl-tRNAs to the A site of the ribosome c. move the peptidyl-tRNA from A site of the ribosome d. bring aminoacyl tRNA to the A site of the ribosome e. deacylate tRNAs during translation - Answer ️️ -c. move the p