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- Multiple Replication Forks in E. coli II On the basis of Figure 28.2, draw a simple diagram illustrating replication of the circular E. coli chromosome (a) at an early stage, (b) when one-third completed, (c) when two-thirds completed, and (d) when almost finished, assuming the initiation of replication at oriC has occurred only once. Then, draw a diagram showing the E. coli chromosome in problem 3 where the E. coli cell is dividing every 20 minutes.Discuss Concepts During replication, an error uncorrected by proofreading or mismatch repair produces a DNA molecule with a base mismatch at the indicated position: The mismatch results in a mutation. This DNA molecule is received by one of the two daughter cells produced by mitosis. In the next round of replication and division, the mutation appears in only one of the two daughter cells. Develop a hypothesis to explain this observation.How does the double helix structure of DNA support its role in encoding the genome? The sugar-phosphate backbone provides a template for DNA replication tRNA pairing with the template strand creates proteins encoded by the genome Complementary base pairing creates a very stable structure Complementary base pairing allows for easy editing of both strands of DNA.
- 3. Replicate the following segment of DNA. 5'-ATCGGCTACGTTCAC-3' 3'- TAGCCGATGCAAGTG-5'; and show the direction of the new strands and explain lagging and leading strands are, also explain how this is semiconservative replicatication. Are the new strands identical to the original segments of DNA?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.a. Replicate this sense strand to create a double-stranded DNA helix. Write your answers in CAPS LOCK with NO SPACES between the nucleotides - e.g. ATGCCGAG..... TGAGGATGAAACTCACACCGGGGCGCAGTTTGGCACTTAGATTCTTGTACACGACCTAGTATAACACAGTT complementary strand: b. Using this DNA double helix, express the gene – i.e. determine the resulting polypeptide sequence by using the correct reading frame. Write your answers using the three letter abbreviation for each amino acid. polypeptide sequence: does the sense strand DNA sequence have 5’ and 3’ UTR sequences? 5'UTR = 3'UTR =
- a. Draw roughly the comparative electrophoretic mobilities of close circular DNA, open circular DNA and super coiled DNA, all having the same molecular weight. Why is the separation possible given that all the DNAs (in (a)) have the same molecular weight?Explain the- A Coherent Model- DNA Replication ?1) The function of ligase is to seal nicks in the backbone of a DNA strand. The function of AP endonuclease is to create a nick in the backbone of a DNA molecule adjacent to an apurinic site, which allows DNA polymerase II access to the DNA to repair the damage and prevent a mutation resulting from the use of a damaged or erroneous strand of DNA as template during DNA replication. Why doesn't ligase simply seal up the nicks the AP endonuclease introduces before DNA pol II can do anything?
- 1. UV light damages DNA by the formation of pyrimidine dimers. Draw the detailed chemical structure of a pyrimidine dimer and explain why the formation of such aberrant structures results in tumor-enabling genomic instability. 2. Use your own words to define ultraviolet light. Include a comparison of naturally-occurring vs artificial UV. What is UV-A? UV-B? UV-C? Which one(s) is (are) the most damaging to DNA? Why? Which one(s) are most likely to lead to a mutation in skin cells? Why? What type of UV light is used in tanning beds?a) If you isolated DNA from the ear and the tail of the same mouse, would you expect the DNA, isolated from the two tissue types, to be the same? Why? b) Provide one difference between DNA replication in eukaryotes and prokaryotes with regard to their origin (s) of replication.Explain the molecular mechanism of DNA polymerization by DNA polymerase and explain why DNA polymerase 3 and not dna polymerase 1 is responsible for replicating the bacterial genome.
