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Chapter 17 Solutions
Becker's World of the Cell (9th Edition)
- Human Genome Replication Rate Assume DNA replication proceeds at a rate of 100 base pairs per second in human cells and origins of replication occur every 300 kbp. Assume also that human DNA polymerases are highly processive and only two molecules of DNA polymerase arc needed per replication fork. How long would it take to replicate the entire diploid human genome? How many molecules of DNA polymerase does each cell need to carry out this task?arrow_forwardApplication/ Analysis Explain how the anti-parallel structure of DNA predicts its replication mechanism. Identify the major and minor groove of DNA and explain why they are there. Differentiate between semiconservative, conservative, and dispersive replication. Interpret a diagram of a bi-directional replication fork and correctly determine strand polarity and fork direction.arrow_forwardnand portable. 6.5 mm micro-edge 16405U processon USE YOUR SMARTPHONE w micro-edge display design See dnclamers on product bo Revi Vide Fea Sameness and Variety (Mitosis and Meiosis) 161 Spe Example Sup SCAN Expressed using apples, DNA replication looks like this. Go look at the model of DNA on the demonstration table. We have been presenting DNA as a straight ladder, but actually it is twisted on itself like a spiral staircase. This shape is called a heliz. Observe The Chromosome Normally DNA exists as loose strands (chromatin) in the nucleus of a cell. This nuclear DNA sends a message (RNA) to the ribosomes where protein and enzymes are synthesized. When stretched out, the length of one DNA molecule in a human cell is almost 4 cm. However, the cell itself is but a tiny fraction of that size. During cell reproduction the DNA must be able to move around. So it shortens its length by tightly coiling up. In doing so, the DNA strands become wider and are visible under a microscope.…arrow_forward
- Please help me solve this problem. I am really having a hard time understanding this lesson. Please help. Kindly provide all the necessary information to this problem. Thank you! Please answer numbers 1-5 determine what amino acid will be formed from the given DNA strand below: 3’ T A C A T G C C G A A T G C C 5’ Note: Prepare the partner strand of this DNA. Discuss how will replication happen by mentioning the enzyme needed then transcribe to form mRNA. Discuss what will happen to mRNA, then translate, mentioning the anticodon to be used. Look at the genetic code to know what amino acid will become part of the polypeptide chain. 1. Partner DNA strand 2. the mRNA strand 3. The tRNA 4. the formed amino acids 5. the discussion of the entire procedurearrow_forwardI. 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…arrow_forwardChoose the False answer. Single stranded DNA. a.has a left-handed alpha helical structure. b.does not have defined conformation. c.is formed by thermal dissociation of double stranded DNA. d. is used as a temperature in the replication process.arrow_forward
- primase 22. The enzyme DNA replication. Why are the RNA primers necessary for DNA synthesis ( one statement)? Are the same number of primers required for the leading and lagging strand (no more than two statements)? synthesizes the RNA primers required forarrow_forwardExplain the effect(s) the following scenarios would have on DNA replication or translation. For each scenario, state whether DNA replication or translation would be able to proceed and explain your reasoning. Low amount of 7- methyl guanosine in the nucleus low amount of DNA polymerase I lack of helicasearrow_forwardDNA Replication Drawing Name: Using penci, you will draw a representation of DNA replication along the leading and lagging strands. Follow the directions below, drawing each element in its proper location along the replicating DNA strand. Once you are sure everything is in the correct place, complete your drawing by adding color to distinguish objects as separate. 1. On the diagram below, label the 5 and 3' onds of both parental DNA strands (you can make up which is which) 2 Label the replication fork 3. Draw and label helicase 4. Label the overall direction of DNA replication 5. Draw and label single stranded binding proteins 6. Draw and label the leadng strand 7. Draw and label a single DNA polymerase IIl on the leading strand 8. Draw and label an RNA primer on the leading strand 9. Draw and label a DNA polymerase I on the leading strand 10. On the lagging strand, draw and label at least three Okazaki fragments 11. On the lagging strand. draw and label at least two DNA polymerase IIl…arrow_forward
- Suppose DNA polymerase synthesizes DNA at a rate of 1130 bases per minute in a newly discovered bacteria and that bacteria replicates their chromosome every 40 min. 3' Sugar-phosphate backbone Calculate the total number of nucleotides in the bacterial chromosome. number of nucleotides: F0.34 nm A T Calculate the length of the entire bacterial chromosome using the appropriate information from the diagram of DNA. - 3.4 nm length: nm 3' 2 nmarrow_forwardPicture is only attached as reference. How does the model attached show DNA Replication?What is the importance of DNA Replication?What will happen if there will be an error during the DNA Replication Process?arrow_forwardModified True or False: Write TRUE if the statement is correct, if the statement is false, change the word/ words in (parenthesis) to make it correct 1. In (ribonucleotides), the pentose sugar is deoxyribose2. (Helicase) is an enzymes that untwist the double helix at the replication forks, separating the two parental strands and making them available as template strands.3. (DNA polymerase I) bind to the unpaired DNA strands, keeping them from re-pairing.4. (DNA polymerase III) catalyzes the synthesis of new DNA by adding nucleotides to a preexisting chain.5. The enzymes that synthesize DNA cannot initiate the synthesis of a polynucleotide they need to have a (promoter) first.6. (DNA gyrase) relaxes the tension created when DNA unwind to avoid supercoiling.7. Between the two strands of a DNA segment, the nitrogen bases are held together by (phosphodiester bond).8. When the ribosome encounters (UAG) in the mRNA it will terminate translation.9. (mRNA) moves from the nucleus to the…arrow_forward
- BiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage Learning