Bacteria exposed to viruses incorporate sections of the virus’s DNA into the CRISPR array sequences in their genome. This mechanism allows bacteria to fight off the viruses, like an immune response: the information in CRISPR spacers served as “coordinates” for recognizing and cutting up invading DNA sequences. Describe what might happen under the conditions described after a bacteriophage infects a bacterial cell and releases its DNA into the bacterial cell. Explain why: The cas genes on the bacterial genome contains a frameshift deletion mutation that alters the function of the protein The bacteria will be unable to elicit an immune response

Bacteria exposed to viruses incorporate sections of the virus’s DNA into the CRISPR array sequences in their genome. This mechanism allows bacteria to fight off the viruses, like an immune response: the information in CRISPR spacers served as “coordinates” for recognizing and cutting up invading DNA sequences. Describe what might happen under the conditions described after a bacteriophage infects a bacterial cell and releases its DNA into the bacterial cell. Explain why: The cas genes on the bacterial genome contains a frameshift deletion mutation that alters the function of the protein The bacteria will be unable to elicit an immune response

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter13: An Introduction To Genetic Technology

Section: Chapter Questions

Problem 11QP: Cloning Genes Is a Multistep Process In cloning human DNA, why is it necessary to insert the DNA...

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A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. It does this by inserting its genetic material (RNA) into the host cell and integrate its genetic material with the host genome. Explain in details how organisms eliminate the expression of viral genes? How this mechanism can prevent virus infections?
Some DNA vaccines use a brief and small electrical shock to get DNA in plasmids into cells. What advantage would there be in using DNA vaccines that consist of plasmids instead of just pieces of double-stranded DNA? The new Covid19 vaccine produced by two companies (Pfizer, Moderna) uses mRNA coding for part of the spike protein of the virus. The virus uses the spike protein to invade human cells where it replicates. Is it surprising that the mRNA must be stabilized with chemicals that need ultra-cold or frozen storage to protect the mRNA from degradation before it causes human muscle cells to make the spike protein? Why not just inject the double-stranded cDNA that codes for the spike protein of the virus? What additional step or steps would you need to use to get the human muscle cells to produce the spike protein if the cDNA was injected to serve as the virus?
The smallpox virus, which actually has a fairly large genome size for a virus (about 190,000 base pairs), must use which of the following enzymes to replicate its nucleic acid? A. DNA-dependent-DNA-polymerase B. RNA-dependent-DNA-polymerase C. DNA-dependent-RNA-polymerase D. RNA-dependent-RNA-polymerase E. reverse transcriptase
Why not just inject the double-stranded cDNA that codes for the spike protein of the virus? What additional step or steps would you need to use to get the human muscle cells to produce the spike protein if the cDNA was injected to serve as the virus? The new Covid19 vaccine produced by two companies (Pfizer, Moderna) uses mRNA coding for part of the spike protein of the virus. The virus uses the spike protein to invade human cells where it replicates. Is it surprising that the mRNA must be stabilized with chemicals that need ultra-cold or frozen storage to protect the mRNA from degradation before it causes human muscle cells to make the spike protein?
Which of the following is a known characteristic or procesds that can lead to genetic changes in some viruses? When two different viral strains of the same type of virus infect a single individual, reassortment/mixing of segmented genome pieces can occur, resulting in new combinations of segments. Genetic rearrangements of the viral genome occurs as a result of duplicate operons in the viral genome undergoing homologous recombination. Environmental conditions trigger the SOS response in viruses, and leads to generation of errors/mutations in the viral genome. Viral RNA polymerases display proofreading capability in replicating the viral genome of certain viruses.
What should be the environmental conditions for the fusion proteins of the influenza virus to show activity? Write. Based on this, what advice can you give people to protect against this virus? explain
A protein spike of a virus has been identified as an important characteristic of the virus. If the protein spike can be replicated then it could be used as a vaccine. The sequence of the viral RNA that produced the protein spike was identified in the laboratory. You were tasked to proceed with the next steps. Identify and describe the methods to replicate the identified protein spike. Note: You have to use the knowledge of “Medical biotechnology” as a foundation for your answers. Please explain in detail
In Hershey-Chase experiment, bacteriophages protein coats were tagged with radioactive isotope S-32. These phages were used to infect E. coli cells and the cells were further centrifuged to form pellets. Why was the radioactivity level of S-32 found greater outside the cells compared to the E. coli cell pellets? Explain briefly. If the experiment is repeated in the same manner but this time the phage protein coats are labelled with isotope X and the phage DNA with isotope Y, which isotope’s radioactivity will be found in greater amounts in the E. coli cell pellets after centrifugation? Explain briefly.
Bacteria exposed to viruses incorporate sections of the virus’s DNA into the CRISPR array sequences in their genome. This mechanism allows bacteria to fight off the viruses, like an immune response: the information in CRISPR spacers served as “coordinates” for recognizing and cutting up invading DNA sequences. Describe what might happen under the conditions described after a bacteriophage infects a bacterial cell and releases its DNA into the bacterial cell. Explain why: 1. The invading phage DNA is recognized by the Cas proteins but not inserted into the CRISPR array region of the bacterial genome: The bacteria will be unable to elicit an immune response and will succumb to the phase infection 2. The cas genes on the bacterial genome contains a missense mutation that increases its cleavage/cut activityThe bacteria will elicit an immune response that will successfully fight the phage infection
With the use of well-illustrated diagrams, reconstruct the entire cloning process by explaining different stages of the cloning process that involves the following:a. Isolation of target DNA fragments (often referred to as inserts)b. Ligation of inserts into the plasmid, creating recombinant molecules c. Transformation of recombinant plasmids into bacteria or other suitable host for propagationd. Screening/selection of hosts containing the intended recombinant plasmid. For this stage(d), discuss the importance of a second marker that can be used for screening of genomic DNA for colonies containing the pka-1 under the principle of insertional inactivation. This should be properly explained using all the attributes of the plasmid described above.
Explain the difference between gene modification and gene addition.Are the following examples of gene modification or gene addition?A. A mouse model to study cystic fibrosisB. Introduction of a pesticide-resistance gene into corn using theT-DNA vector of A. tumefaciens
One of the reasons why phage therapy has not been applied widely is that bacteria can become resistant to bacteriophages as well, through mutations in genes encoding for specific proteins. What would be a protein in the bacterial cell that, if mutated, would make that cell resistant to phage infection?