Concept explainers
Introduction:
The recombinant DNA technology involves isolation of genetic materials (DNA) from donor organisms (human, plant, or microorganism) and inserts them into recipient organisms after genetic manipulation. The main tools involved in the techniques are
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- A graduate student isolates two new retroviruses: Virus A and Virus B. To determine whether these viruses could cause cancer, the student infected human cells with each of the viruses and then transfered the infected cells to nude mice to see if the viruses would cause formation of tumors. The student was able to determine by PCR that both viruses are integrated into the genome of the host cells before transplanting cell in mice. The data for this assay are shown in the figure below. Explain how the mechanism of transduction may be different for these two viruses to yield the observed data (limit 4-5 sentences). Retrovirus Transformation Assay % Cells Cause Tumors 120 100 80 60 40 20 0 0 10 -Virus A -Virus B 30 20 Days Post Infection 40arrow_forwardWhich one of the following statements is true? a. Dideoxynucleotides signal the end of DNA replication in a cell b. None of the provided answers are true c. The DNA sequence determined by an autoradiogram should be identical to the template strand DNA sequence d. The probe hybridization solution used in the Sothern blot technique is approximately pH 10.0 e. The transfer buffer used in the Southern blot technique is approximately pH 7.0arrow_forwardwhich of the following do researchers not need to use during vector cloning? a. a plasmid containing selectable marker genes such as beta galactosidase or ampicillin resistance genes. b. restriction enzymes. c. DNA polymerase d. a growth medium with carefully selected ingredients that take advantage of selectable markers. e. none of the above.arrow_forward
- If you are a genetic engineer and you cloned your gene of interest in a plasmid and you want to know if the protein encoded by the cloned gene is expressed or not, which of the following methods is the right one to use? Select one: a. Northern blot b. Both Northern and Western blots c. Agarose gel with polyacrylamide d. Western blot e. Protein gel and northern blotarrow_forwardA has been assembled by researchers and transplanted into a donor bacterial strain to study never before seen gene functions. Select one: a. Transgenic genome b. Recombinant DNA sequence c. Knockdown gene d. Synthetic genome o e. Recombinant plasmid Clear my choice is changing our Sequencing the human genome, the development of microarray technology, and understanding of complex diseases like cancer. They help us to observe the gene expression patterns in genetic disease by comparing the healthy tissue of individuals against the disease state of others. Select one: C a. Proteomics o b. Metagenomics MO C. Functional genomics d. Personal genomics O e. Developmental genomics Clear my choicearrow_forward5) Below is an image that shows both reproductive and therapeutic cloning. Use this image to answer compare and contrast therapeutic and reproductive cloning. Are they used for similar means…etc. Once you have done that answer the question below. a) There are two types of therapeutic cloning. What are they and how are they different?arrow_forward
- The CRISPR-Cas9 system can be used to: a. sequence a genome in living cells b. edit a gene in living cells and organisms c. diagnose sickle-cell anemia d. identify a specific gene e. detect gene expression under different conditionsarrow_forwardWhich of the following sequence shows the correct order of the steps involved in Recombinant DNA Technology I. Joining of a gene into a suitable vector. II. Introduction of this vector into a suitable organism. III. Multiplication or expression of a gene of interest. IV. Selection of transformed recombinant cells with a gene of interest. V. Identification and isolation of genes of interest. A. V, I, II, IV, III B. V, II, I, IV, III C. V, IV, III, II, I D. V, I, II, III, IVarrow_forwardWhich of the following is NOT common to all repair mechanisms? A. Detection of the lesion B. Removal of the damaged DNA sequence/ nucleotide/ base C. Removal of free radicals at the site of injury D. Repair of the lesion E. Involvement of enzymes in removing the lesion and/or repair of the damaged sequence/nucleotide/base.arrow_forward
- 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 and will succumb to the phase infectionarrow_forwardThe idea behind PCR-based diagnostics is that a very small number of microbial genomes in a patient sample can be multiplied by PCR and more easily detected by the clinical team managing the patient’s care. Also, genetic-based diagnostics are very useful for viral infections because we don’t have biochemical tests, etc. to distinguish one virus from another (remember, viruses are metabolically inactive). However, a lot of work goes into the development of these tests. For instance, PCR requires primers that are complementary to the viral genome that is being copied. If primers are complementary to the target genome, what must scientists know to design primers that bind to the viral genome to be copied? (I mean this to be a general question; don’t look up the details of designing primers)arrow_forwardDEFINE THE FOLLOWING: 1) restriction enzyme 2) plasmid 3) recombinant DNAarrow_forward
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