What role do restriction enzymes play in DNA profiling and analysis
Added by Esther M.
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Each enzyme recognizes a particular short sequence of nucleotides and cleaves the DNA at or near that site. Show more…
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What is the role of restriction enzymes? Why is it essential to have these enzymes to perform DNA analysis?
Anand J.
Biotechnology: The Purpose of Restriction Enzymes to Protect the Host DNA from Foreign DNA. Cutting Requirement (Gene): Inserts the DNA of interest into the host DNA. Ligase the new DNA to the host DNA. Blunt ends are the result of cutting by restriction enzymes. Each enzyme recognizes a specific nucleotide sequence. Treatment of a nucleotide sequence with DNA ligase. Eukaryotic DNA, prokaryotic plasmid, infection of a cell with bacteriophage, presence of reverse transcriptase, DNA breaking down. Using genetic engineering, genes can be moved from one organism to potentially any other organism. Easily converted to produce any desired product. When used, can cure all known diseases, make plants resistant to all insect pests, create DNA at a specific location with restriction enzymes, ligases, reverse transcriptase, polymerase, plasmids. The following base ratios always equal: (A+T)/(G+C), C/T, (A+G)/(C+T), G/A. If a linear piece of DNA has three sites for a particular restriction enzyme, how many fragments will that restriction enzyme cut the DNA? The answer cannot be determined. 2 restriction sites are symmetrical about their midpoint (palindromic). Assuming that most of the following is most likely to represent a restriction site: A) 5'-GGGGGG-3', B) 5'-GGATCC-3', C) 5'-AAACCC-3', D) 5'-GGGTTT-3', E) 5'-TTTGGG-3'.
Madhur L.
Experimental manipulation of DNA: Scientists discovered that naturally occurring enzymes in bacteria could cut DNA into pieces. These restriction enzymes were isolated and are now used routinely to cut DNA at specific locations along the sequence. This exercise will enable you to visualize how this works and how this technique can be applied to disease analysis. You will have a piece of paper that has DNA strands on it, represented by this: E P B H B The letters E, P, B, and H along the DNA signify specific nucleotide sequences where restriction enzymes cut the DNA; for example, E is a restriction enzyme called Eco RI, and it cuts between the G and the A in the following sequence GAATTC. The other letters represent different restriction enzymes. 1. Each line on the DNA strand marks 1 inch. If this piece of paper represents a piece of DNA and 1 inch corresponds to 1 KB (kilo bases or 1,000 base pairs of DNA), what is the length of your DNA in KB?
Jenny W.
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