Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 20, Problem 4AWK
Summary Introduction
To review:
Production of rDNA (recombinant deoxyribonucleic acid) drug Humulin.
Introduction:
Insulin is a big requirement for people suffering from insulin-dependent diabetes (diabetes mellitus). Earlier, insulin from pigs and cattle was used for the therapy of these patients. This was not only expensive and difficult to extract, but also raised a lot of ethical questions. Being from a nonhuman source, there would also be a risk of an immune response against it. RDT or recombinant DNA technology has changed the world of research. Proteins produced as a result of RDT can be used as drugs.
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Herbert Boyer and Stanley Cohen pioneered the technique of DNA cloning allowing genes to be transferred from another biological species easily. Their work also gave rise to the development of different recombinant proteins with therapeutic applications like insulin and growth hormone. The former was cloned using Escherichia coli. coli in 1978. With this breakthrough, the first licensed drug produced using recombinant DNAtechnology was human insulin, developed by Genentech, licensed and marketed by Eli Lilly in 1982. Scientists were able to identify and isolate the gene fragment or the gene of interest, in this case, the gene that is responsible for producing insulin. Moreover, they were able to isolate the bacterial DNA of E. coli. The plasmid and DNA fragment were cut using a restriction enzyme. This DNA fragment was inserted into the plasmid using a DNA ligase. When the DNA fragment was then placed into the bacterial DNA, it was then introduced to the host cell (E. coli) and was then…
Chapter 20 Solutions
Human Biology: Concepts and Current Issues
Ch. 20 - Prob. 1QCCh. 20 - GM foods are created for a variety of reasons,...Ch. 20 - Explain how DNA is sequenced.Ch. 20 -
2. Describe the enzymes used in recombinant DNA...Ch. 20 - Prob. 3CRCh. 20 - Discuss the polymerase chain reaction technique,...Ch. 20 - Prob. 5CRCh. 20 - Prob. 6CRCh. 20 - Prob. 7CRCh. 20 - Prob. 8CR
Ch. 20 - Prob. 9CRCh. 20 -
10. List the diseases that gene therapy may be...Ch. 20 - Prob. 1TYCh. 20 - Prob. 2TYCh. 20 - Which of the following is used to separate...Ch. 20 - Genetically engineered human insulin, human growth...Ch. 20 - Prob. 5TYCh. 20 - All of the following statements about transgenic...Ch. 20 -
7. "Gene pharming” refers to:
a. using transgenic...Ch. 20 - Prob. 8TYCh. 20 - Prob. 9TYCh. 20 - Prob. 10TYCh. 20 - Which of the following is needed for sequencing...Ch. 20 - A tiny amount of blood was recovered from a crime...Ch. 20 - Which technique will allow amplification of the...Ch. 20 - A gene for a bacterial protein with insecticide...Ch. 20 - Prob. 15TYCh. 20 -
1. What do you think are the chances that someone...Ch. 20 - Imagine a future in which the respiratory effects...Ch. 20 - Prob. 3AWKCh. 20 - Prob. 4AWKCh. 20 - Prob. 5AWKCh. 20 - There is interest in producing vaccines in foods....Ch. 20 - Transgenic plants have the potential to improve...
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- Researchers can isolate a sample of cells, such as skin fibroblasts, and grow them in the laboratory. This procedure is called a cell culture. A cell culture can be exposed to a sample of DNA. If the cells are treated with agents that make their membranes permeable to DNA, the cells may take up the DNA and incorporate it into their chromosomes. This process is called transformation or transfection. Scientists have transformed human skin fibroblasts with methylated DNA and then allowed the fibroblasts to divide for several cellular generations. The DNA in the daughter cells was then isolated, and the segment that corresponded to the transformed DNA was examined. This DNA segment in the daughter cells was also found to be methylated. However, if the original skin fibroblasts were transformed with unmethylated DNA, the DNA found in the daughter cells was also unmethylated. With regard to the transformed DNA, do fibroblasts perform de novo methylation, maintenance methylation, or both?…arrow_forwardIn this question what do you think about the production of recombinant insulin for medical purposes from your views?arrow_forwardWhich of the followings statements are true about DNA polymerase? 1.) It can only go in one direction, meaning the lagging strand can't be synthesized continuously. 2.) It cannot start a DNA strand from scratch, so another enzyme is needed to create "primers" as a starting point. 3.) It cannot copy epigenetic marks (such as methyl groups) on its own; these must be "copied" onto the daughter DNA strand by other enzymes after DNA replication. 4.) All of the abovearrow_forward
- You are an expert in DNA-repair mechanisms. You receive a sample of a human cell line derived from a woman who has symptoms of xeroderma pigmentosum. You determine that she has a mutation in a gene that has not been previously associated with XP. How is this possible?arrow_forwardLet’s say that you want to find out the difference in nucleotide sequence among two DNA strands, one of which is isolated from the liver of a liver cancer patient and the other one is isolated from the liver of a healthy individual. How you can do that, please explain in detailsarrow_forwardWhat is complementary base pairing? Be able to figure out the nucleotide sequence of the 2nd strand of DNA if you’re given the first (as happens when DNA replicates); or the RNA sequence that would pair with a DNA sequence (as happens during transcription). What is Biotechnology? Recombinant DNA? What is a restriction enzyme and how is it used to make recombinant DNA? What is a transgenic animal? Transgenic crops? What is Forensics? Why are the following things important in forensic (or medical genetic) testing: PCR? STRs? What is CODIS? What is a multifactorial trait? A polygenic trait? Some examples of each? How do they differ from Mendelian traits? What is cancer? How do cancer cells differ from normal cells? Why is control of the cell cycle crucial? Genetic influences in developing cancer: what is an oncogene? a tumor suppressor? Difference between a benign and a malignant tumore? Metastasis?arrow_forward
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