hat happened to the DNA at the different temperatures (95, 75, 55 degrees)? How does Polymerase Chain Reaction exploit this property of DNA?
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What happened to the DNA at the different temperatures (95, 75, 55 degrees)? How does Polymerase Chain Reaction exploit this property of DNA?
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- What happened to the DNA at the different temperatures? How does Polymerase Chain Reaction exploit this property of DNA?A circular, double-stranded DNA contains 2100 base pairs. The solution conditions are such that DNA has 10.5 bp/turn. (a) What is Lo for this DNA? (b) The DNA is found to have 12 left-handed superhelical turns. What is the superhelix density o?A double-stranded DNA molecule is 1 cm long, and the percentage of adenine is 15%. How many cytosines does this DNA molecule contain?
- The two strands of a DNA double helix can be separated by heating. If you raise the temperature of a solution containing the three DNA molecules below, in what order do you think these DNAs will "melt"? Explain 1)5’-GCGGGCCAGCCCGAGTGGGTAGCCCAGG-3’ 3’-CGCCCGGTCGGGCTCACCCATCGGGTCC-5’ 2) 5’-ATTATAAAATATTTAGATACTATATTTACAA-3’ 3’-TAATATTTTATAAATCTATGATATAAATGTT-5’ 3) 5’-AGAGCTAGATCGAT-3’ 3’-TCTCGATCTAGCTA-5’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.The Bacteria Escherichia coli DNA genome has a molecular mass of about 3.1 X 10 9 D. In your answers, show how you came up to each result?(a) How many base pairs does this bacterium contain? (b) How many full double-helical turns does this DNA contain? (c) How long is this DNA in micrometer?
- The Bacteria Escherichia coli DNA genome has a molecular mass of about 3.1 X 10° D. In your answers, show how you came up to each result? (a) How many base pairs does this bacterium contain? (b) How many full double-helical turns does this DNA contain? (c) How long is this DNA in µm?The complementary strands of DNA in the double helixare held together by hydrogen bonds: G ≡ C or A = T.These bonds can be broken (denatured) in aqueous solutions by heating to yield two single strands of DNA(see Figure 1-13a). How would you expect the relativeamounts of GC versus AT base pairs in a DNA doublehelix to affect the amount of heat required to denatureit? How would you expect the length of a DNA doublehelix in base pairs to affect the amount of heat requiredto denature it?What is the axial ratio (length:diameter) of a DNA molecule 20 μm long?
- 12:49 0 14. You want to amplify the DNA between two stretches of sequence shown in the figure below. Explain which one of the following primer pairs would allow you to amplify the DNA by PCR. DNA to be amplified 5'-GACCTGTGGAAGC -CATACGGGATTGA-3" 3'-CTGGACACCTTCG GTATGCCCTAACT-5" primers (1) 5'-GACCTGTCCAAGC-3 (2) 5-CTGGACACCTTCG-3 (5) 5-CATACGGGATTGA-3" (6) 5°-GTATGСССТААСТ-3° (3) 5'-CGAAGGTGTCCAG-3' (7) 5'-TGTTAGGGCATAC-3" (4) 5'-GCTTССАСАGGTC-3° (8) 5'-TCAATCCCGTATG-3' END 5 THE ENDIn a DNA double helix, why doesn't an A or T form two hydrogen bonds (out of the three possible ) with G or C? Explain how DNA replication is bidirectional and discontinuous in nature?Why does DNA with a high A-T content have a lower melting temperature, Tm, than DNA with a high G-C content?