Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 17, Problem 27RQ
Summary Introduction
To review:
The process of retention of DNA (deoxyribonucleic acid) methylation from one generation to another.
Introduction:
The DNA of an individual carries the genomic information. DNA methylation is the process of addition of a methyl group to the carbon-5 of the cytosine (C) residue. The process of the DNA methylation is essential for normal development. It plays a major role in various molecular biology processes, like repression of transposable elements, X-chromosome inactivation, genomic imprinting, aging, and carcinogenesis.
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The genome’s functional gene products are either _____________ or _____________.
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Chapter 17 Solutions
Biochemistry: The Molecular Basis of Life
Ch. 17 - Prob. 1QCh. 17 - Prob. 2QCh. 17 - Prob. 3QCh. 17 - Prob. 4QCh. 17 - Prob. 5QCh. 17 - Prob. 6QCh. 17 - Prob. 7QCh. 17 - Prob. 8QCh. 17 - Prob. 1RQCh. 17 - Prob. 2RQ
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- QUESTION NO. 1 Patients with the rare genetic disease xeroderma pigmentosum (XP) are very sensitive to light and are highly susceptible to skin cancers. The study of such patients has enhanced our knowledge of DNA repair because XP is caused by defective DNA repair nucleotide excision repair. (A variant, XP-V, is deficient in postreplication repair.) In nucleotide excision repair A. removal of the damaged bases occurs on only one strand of the DNA. B. only thymine dimers generated by UV light can be removed . C. the excision nuclease is an exonuclease. D. a single multifunctional enzyme carries out the repair process. E. only the damaged nucleotides are removed. QUESTION NO.2 Homologous recombination: A. occurs only between two segments from the same DNA molecule. B. requires that a specific DNA sequence be present. C. requires one of the duplexes undergoing recombination be nicked in both strands. D. involves a…arrow_forward_____________ are the linear sequences of nucleotides in an organism’s genetic information.arrow_forwardA base change that has no discernible effect is called a____________________ mutation.arrow_forward
- Enzymes isolated from bacteria that cut DNA at specificsequences are called ____________________.arrow_forwardQuestion 43 The addition of restriction endonucleases in the cloning process is done following the ligation with DNA ligase. A) True B) Falsearrow_forwardQuestion 20 : The restriction map of the plasmid pSC48 is presented below. The numbers in parentheses correspond to the position of the respective restriction site with respect to position (0). (0) BamHI ЕcoRI (4640) (620) PSC48 5200 pb BamHI (1130) Smal ЕcoRI (3420) (1350) The plasmid has been digested by one or several restriction enzyme(s). The digestion products have been analysed by agarose gel electrophorese. (see figure below). 1 2 10,000 8,000 6,000 5,000 4,000 3,000 2,500 –2,000 - 1,500 -1,000 -750 - 500 -250 1. Digestion products 2. Size marker base pairs Which restrcition enzyme(s) have been used for the digestion? (Indicate the right answer) А- ЕсoRI. B- EcoRI/BamHI. C- EcoRI/Smal. D- BamHI. E- Smal. | |arrow_forward
- Expressed sequences of DNA are called ________________.arrow_forwardQuestion 49 The Sanger method of DNA sequencing follows the principle of complementarity just like in the replication process. A) True B) Falsearrow_forwardQUESTION 8 Consider the pathway for the synthesis of the amino acid arginine in Neurospora: ARG-E → citrulline ARG-F ARG-H ornithine argininosuccinate arginine Mutant strains of Neurospora may carry one or more mutations. Neurospora mutant strain b is grown on minimal media plus supplements as shown. Growth is shown by (+) and no growth is shown by (o). Supplements ornithine mutant nothing citrulline arginino- succinate arginine strain What can you conclude from these data? O Strain a has only one mutation and it is in ARG-E. O Strain b has only one mutation and it is in ARG-H. O Strain a has a mutation in ARG-F and strain b has a mutation in ARG-E. O Strain b has mutations in ARG-E, ARG-F, and ARG-H. + +arrow_forward
- The purpose of mitosis in human cells is for the production of two diploid, _________________ cells.arrow_forwardTransposable elements are short segments of DNA, presentin ___________ locations, that move around the genomearrow_forwardA _____________ is a multienzyme complex that synthesizes RNA primers in E. coli DNA replication.arrow_forward
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