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- b. The diagram below is of a short stretch of prokaryotic chromosomal DNA in the process of replication. Please supply the specific pieces of information requested by the boxes below. 1. What enzyme relaxes the supercoils? 2. What enzyme unwinds the DNA? 7. What does this arrow represent? 3. What enzyme synthesizes the RNA primer 8. Why should this single-stranded portion be stabilized? 4. What is this short segment of DNA called? 9. What enzyme synthesizes this long DNA segment? 5. What enzyme removes the RNA primer and replaces it with DNA? 10. Is this the leading or the lagging side? 6. What enzyme joins the short segments of DNA together? 31. For each of the items below, give a brief description (indicate function for enzymes) and indicate in which process (replication, transcription, or translation) it is involved with. Description/Funetion catalyzes the unwinding of DNA strands Process involved in helicase replication 1. RNA primer 2. leading strand 3. RNASE 4. anti-sense strand 5. anticodon 6. RNA polymerase II 7. DNA polymerase 8. promoter site 9. DNA ligase 10. exit sitea. As a result of the structure of DNA and RNA, replication, transcription and translation are possible. What can nucleic acids do, as a result of their structure, that enables these processes to occur? The figure below shows a simplified schematic representation of a segment of DNA. The DNA is labelled with the numbers 1 – 14 for easy reference. -35 sequence Pribnow box 5' UTR 3' UTR DNA TTGACA TATAAT -35 -10 Gene a Gene B Gene y 1 2 3 4 5 6 7 8 9 10 11 12 13 14 UTR = untranslated region b. At which position on the DNA (number 1 - 14) will transcription be initiated? c. At which position on the DNA (number 1 - 14) will the first signal for translation be found? d. Between which two regions on the DNA will the polyadenylation signal be found? Use the numbers to indicate the region. e. Between which two regions on the DNA will the first Shine-Dalgarno / Ribosome Binding Sequence be found? Use the numbers to indicate the region.
- a. Propose three different mutations to prevent initiation, elongation, and termination of bacterial DNA replication, respectively. Explain how/why each mutation would prevent its respective step. (Hint: mutations can be in genes that encode proteins or regulatory DNA sequences) b. In the early 1900s, Avery, MacLeod, and McCarty performed an experiment in bacterial cells to determine whether DNA, RNA, or protein functions as the 'transforming molecule' (i.e. the genetic material). In your own words, how did their experiment (depicted in the figure below) help to answer that question?6a. Given the following mutated sequence (with respect to the normal sequence), what TYPE of mutation occurred: AAGCTTACExplain, in detail, the process of DNA replication. Include in your answer, a diagram, the cellular location and reason for DNA replication, the names of all enzymes/molecules involved, and the sequence of events. a. Explain, in detail, the process of mRNA translation. Include in your answer, a diagram, the cellular location and reason for translation, the names of all enzymes/molecules/sites involved, and the sequence of events. Please help explain in fewer than 8 sentences!
- a. Why do bacteria make restriction endonucleases? b. What is it about the endonucleases that prevents bacteria from destroying their own DNA?OR b. Discuss the structure of the replication fork and every protein used (include their specific functions) during DNA replication of a prokaryotic organism.I. What is the correct order of enzyme action during DNA replication? Number the steps from 1 to 7. HINT: Refer to the slide show and video lecture on this topic to help you solve this one: Synthesis of RNA primers (priming) Ligation II. A double-stranded DNA molecule with the sequence shown below can produce a polypeptide that is four amino acids long. Identify which DNA strands are the coding and the transcribed template strands by circling C or T to the left of the table below, respectively. Use an arrow to indicate the direction of transcription. In the table, show the mRNA sequences and amino acids in this peptide. In spaces to the left and right of the table, label all 5' and 3' ends of all relevant nucleic acid strands. READ CAREFULLY: The table gives you the possibility of filling in answers that show transcription from either strand or in either direction. You are only required to fill in the information relevant to ONE PEPTIDE (no others). Refer to the genetic code on the…
- 3b) Briefly explain what telomerase does, how it accomplishes what it does, and why that allows a cell to completely and accurately replicate the ends of linear DNA molecules. (please note that the question does not ask you to explain the entire process of replication of the end of a linear DNA strand, it only asks about the function of telomerase in this process)Answer the following questions: 1.)Explain in detail, how DNA replication occurs, include DNA polymerase, RNA polymerase , primase and ligase. 2.) Explain transcription and translation, explain the roles of chromosomes DNA , messenger RNA, transfer RNA, and ribosomal RNA in the process as well as how complementary base pairing is included. 3.) Illustrate a hypothetical genetic code by spelling out the nucleotide codons of a segement of mRNA and indicating the sequence of amino acids that could be coded for in the process of protein synthesis.a. Pfu Polymerase b.dNTPs c.Buffer Match each component above to the correct function(s) listed below. Write your selection(s) for each component. You may have more than one answer for each. 1. unwinds DNA 2. synthesizes new DNA strands 3. enzymatically catalyzes Quikchange 4. nucleotide source for new DNA strands 5. Energy source for reaction(s) 6. Repairs errors in base pair matching 7. Maintains pH and salt levels 8. Creates polymer chains