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- A plasmid is a DNA double helix in which the ends of each of the strands of nucleotides are attached to each other, forming a circular DNA molecule. 1) True 2) FalseTRUE OR FALSE a) The long solenoid structure of the chromatin material binds to a protein scaffold through the SARs or MARs in the DNA. b) There can be a quantitative determination of the degree of supercoiling in a DNA sample.Since DNA is a hydrophillicmoelcule, it cannot pass through cell membranes. Name and explain the technique with which the DNA is forced into (ii) a bacterial cell (ii) a plant cell (iii) an animal cell.
- in the gel than a A DNA molecule that is 1000 base pairs in length would go molecule that is 200 base pairs in length. A) further B) you cannot tell from the information provided C) the same distance D) not as farEDTA weakens the cell wall by removing ions that help hold it together while glucose prevents premature cell lysis due to osmosis in cells with weakened cell walls. You have made a batch of resuspension solution to isolate plasmid DNA, but you forgot to add EDTA. What do you think will happen when you try to perform a plasmid isolation procedure with this reagent? Why?You have begun your career in medicinal biochemistry and have just discovered a bacterial DNA plasmld (transferabl ring of DNA) that appears to destroy the Ebola virus. In order to characterize your new plasmid, the molar mass of the plasmid must be determined. You dissolve 25.00 mg of the purified plasmid in 0.200 mL of water at 2 °C and find the osmotlc pressure of this solution is 1.20 Torr at 20 °C and 1 atm pressure. Answer the following about the Ebola-killing plasmid. 33.) The osmotlc pressure of the system is: (a) 1 atm (b) 0.016 atm (c) 6.5 X 10-5 atm (d) 22.59 atm (e) 0.0016 atm
- As you should recall, DNA, when not being actively transcribed, has a double helical structure. This portion of the DNA has had the two strands separated in preparation of transcribing for a needed protein. The following is one of the two complimentary strands of DNA: 3' - AACCAGTGGTATGGTGCGATGATCGATTCGAGGCTAAAATACGGATTCGTACGTAGGCACT - 5' Q: Based on written convention, i.e. the 3'-5' orientation, is this the coding strand or the template strand? ______________________________ Q: Assuming this strand extends from base #1 to #61 (going left to right), interpret the correctly transcribed mRNA and translated polypeptide for bases 24 - 47: mRNA: ___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___-___- polypeptide chain: ________--________--________--________--________--________--________--________A DNA strand was sequenced using the Sanger method (https://www.youtube.com/watch?v=KTstRrDTmWI). The reaction tube contained the DNA strand, fluorescently labelled dideoxynucleotide triphosphates (ddATP – yellow, ddGTP – green, ddCTP – blue, ddTTP - red), deoxynucleotide triphosphates, DNA polymerase, or its Klenow fragment. Synthesis of DNA is allowed to proceed, and the results are shown on the right: 15 14 13 12 11 10 (a) What is the sequence of the copy and the template strands? (b) If the template strand were in the 5'-3' direction, what will be the sequence of the DNA copy? Nucleotide LengthDNA molecules of different sizes are often separated with the use of a technique called electrophoresis . With this technique, DNA molecules are placed in a gel, an electrical current is applied to the gel, and the DNA molecules migrate toward the positive (+) pole of the current. What aspect of its structure causes a DNA molecule to migrate toward the positive pole?
- a) If you isolated DNA from the ear and the tail of the same mouse, would you expect the DNA, isolated from the two tissue types, to be the same? Why? b) Provide one difference between DNA replication in eukaryotes and prokaryotes with regard to their origin (s) of replication.Why was it necessary to mash the strawberries extensively with your hands? (hint: you wouldn’t have to do this step with an animal cells). Why do we treat the cells with soap when conducting DNA extraction? And why do we add salt when doing the DNA extraction?You want to digest 1 µg of plasmid DNA in a final volume of 50 μL. Your solution containing plasmid has a concentration of 25 ng/μL. How many μL of your plasmid solution do you need to add to your reaction tube to digest your desired mass of plasmid?