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- (e) What difference would it make to bidirectional DNA replication if both modes of chain extension were equally favourable?(a) How fast does template DNA spin (expressed in revolutions per second) at an E. coli replication fork? (b) What is the velocity of movement (in micrometers per second) of DNA polymerase III holoenzyme relative tothe template?Assume that the sequence of bases shown below is presenton onenucleotide chain of a DNA duplex and that the chain has openedup at a replication fork. Synthesis of an RNA primer occurs on thistemplate starting at the base that is underlined.(a) If the RNA primer consists of eight nucleotides, what is itsbase sequence?(b) In the intact RNA primer, which nucleotide has a free 3'-OHterminus?3'.......GGCTACCTGGATTCA....5'
- a) If you isolated DNA from the ear and the tail of the same mouse, would you expect the DNA, isolated form the two tissue types, to be the same? Why? (2) b) Provide one difference between DNA replication in eukaryotes and prokaryotes with regards to their origin(s) of replication. (1) For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). 14px E EY A Y BIVS Paragraph Arial ABC x² X2 ?次T Te 田田国王 用 图 +](a) Eukaryotic DNA replication is more complex than prokaryotic replication. Give one reason why this should be so. (b) Why might eukaryotic cells need more kinds of DNA polymerases than bacteria?1. On a piece of paper, replicate the following segment of DNA: 5’ ATCGGCTACGTTCAC 3’ 3’ TAGCCGATGCAAGTG 5’ a.) show the direction of replication of the new strands and explain what the lagging and leading strands are. b) Explain how this is semiconservative replication. Are the new strands identical to the original segment of DNA? 2. Createyour own an Illustration of the Central Dogma. Provide your own DNA segment. Use the previous topics as reference.
- 19. Match the letters with the enzymes and macromolecules involved in DNA replication: A E B DNA POLYMERASE CATALYZES COMALENT LINKAGE OF NUCLEOSIDE TRIPHOSPHATE INTO GROWING NEW STRAND INCOMING NUCLEOSIDE D' TRIPHOSPHATE PAIRS WITH A BASE IN THE TEMPLATE STRAND A) i) pyrophosphate (Pi) ii) template strand ii) incoming nucleoside triphosphate iv) new strand v) DNA polymerase1) A bacterial chromosome contains 6.4 million nucleotides of DNA. If synthesis at each replication fork occurs at a rate of 1800 nucleotides per second, how many minutes will it take to completely replicate the chromosome with theta replication? 2) What different mRNA sequences can code for a polypeptide chain with the amino acid sequence Met-Trp-Ile? (Include the stop codon)On paper, replicate the following segment of DNA: 5’ A T C G G C T A C G T T C A C 3’ 3’ T A G C C G A T G C A A G T G 5’a. Show the direction of replication of the new strands and explainwhat causes lagging and leading strands to show different patternsof replication.b. Explain how this is semiconservative replication. Are the newstrands identical to the original segment of DNA?
- Suppose that the double stranded DNA molecule shown was broken at the sites indicated by the gaps in the sequence, and before the gaps were repaired, the fragment in the middle was inverted. Show the sequence of the repaired DNA molecule. Keep the 5’-3’ polarity of the DNA strands and DNA polymerases in mind.) 5’- TAAGCGTAACACGCTAA CAGTAATGCAGAACT GGGTCCTATTTTCGTGCGTACAC – 3’ 3’- ATTCGCATTGTGCGATT GTCATTACGTCTTGA CCCAGGATAAAAGCACGCATGTG -5’ Please note that there are 2 gaps. The second one is between the lines (between T & G in the 1st strand and A & C in the second strand)3’atgtaccatgcgcaaatttaaaggccc5’. a) Using this single template strand of a DNA as a template, write the base sequence of the complementary strand. b) List the molecules must be present for DNA to be replicated and briefly describe their function.What is the basis for the difference in how the leading andlagging strands of DNA molecules are synthesized?(A) The origins of replication occur only at the 5′ end.(B) Helicases and single-strand binding proteins work at the5′ end.(C) DNA polymerase can join new nucleotides only to the3′ end of a pre-existing strand, and the strands areantiparallel.(D) DNA ligase works only in the 3′ S 5′ direction