Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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You conducted an experiment to determine the mechanism of DNA replication in the hypothetical organism
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- There are 2 parts to this question: The following DNA strand (below) is about to undergo DNA replication. a) Please replicate the parental strands into two exact copies TC GATATCGG AGCTATAGCC b) place a centromere between the two replicated copies (or tell me where the centromere would be located),arrow_forwardSuppose a researcher conducts matings between three Hfr bacterial strains and an F− strain. The table shows the order in which genes are incorporated for each strain. Determine the gene order of the chromosome by placing each gene on the outside of the circular chromosome map. Identify the origin of replication for each Hfr strain on the inside of the map to indicate polarity of the origin.arrow_forwardDescribe the main jobs of each of the following enzymes in the E. coli model of replication: A. DNA Polymerase I B. DNA Polymerase II C. DNA Polymerase IIIarrow_forward
- Consider a hypothetical phage whose DNA replicates exclusively by rolling circle replication. A phage with radioactive DNA in both strands infects a bacterium and is allowed to replicate in a nonradioactive medium. Assume that only daughter DNA from the elongated branch ever gets packaged into progeny particles. What fraction of the parental radioactivity will appear in the progeny phage? How many progeny phage will contain radioactive DNA? What is the fundamental difference between the initiation of θ replication and that of the rolling circle?arrow_forwardDNA polymerase occasionally incorporates the wrong nucleotide during DNA replication. If left unrepaired, the base-pair mismatch that results will lead to mutation in the next replication. As part of a template strand, the incorporated wrong base will direct the incorporation of a base complementary to itself, so the bases on both strands of the DNA at that position will now be different from what they were before the mismatch event. The MER-minus strain of yeast does not have a functional mismatch excision repair system, but it has normal base excision repair and nucleotide excision repair systems. Which of the following statements is correct about differences in the mutation spectrum between MER-minus and wildtype yeast? More than one answer is correct. Options: More point mutations will arise in MER-minus yeast. Fewer point mutations will arise in MER-minus yeast as compared with wildtype. Of the total point mutations that…arrow_forwardImagine a bacterial cell with a mutation that renders helicase completely nonfunctional (note that this would be a lethal mutation). What, precisely, would go wrong with replication in this cell? Please describe what goes wrong, as well as all downstream effects.arrow_forward
- A small section of Saccharomyces cerevisiae gene has the amino acid sequence valine, histidine, cysteine, and lysine. A mutation in the above section of the amino acid sequence resulted in the substitution of amino acid histidine with amino acid glutamine. The mutation in the antisense strand DNA of Saccharomyces cerevisiae gene described above involves a. the substitution of thymine base from GTG b. the deletion of second cytosine base from CAC c. the deletion of second guanine base from GTG d. the substitution of second cytosine base from CACarrow_forwardMany of the gene products involved in DNA synthesis wereinitially defined by studying mutant E. coli strains that could notsynthesize DNA. Question: The dnaE gene encodes the a subunit of DNA polymeraseIII. What effect is expected from a mutation in this gene?How could the mutant strain be maintained?arrow_forwardOnce in human cells, which of the following statements might best describe how COVID19 replicates? a) Manipulates DNA Polymerase III to create a leading strand replication of the RNA b) Manipulates DNA Polymerase III to create a lagging strand replication of the RNA c) Manipulates Reverse Transcriptase to transcribe RNA sense strand into DNA antisense strand then back d) Manipulates RNA Polymerase II to transcribe RNA sense strand into RNA antisense strand then back e) Manipulates RNA Polymerase III to transcribe ribosomal RNAs for replicationarrow_forward
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