The DNA from sea urchins contains about 32% A and about 18% G. What percentages of T and C would you expect in sea urchin DNA? Explain.
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The DNA from sea urchins contains about 32% A and about 18% G. What percentages of T and C would you expect in sea urchin DNA? Explain.
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- Chemical analysis shows that a nucleic acid sample contains A, U, C, and G. Is this DNA or RNA? Why?In 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 in detail.Why does DNA with a high A-T content have a lower melting temperature, Tm, than DNA with a high G-C content?
- When Chargaff was performing his experiments, the tetranucleotide hypothesis, which stated that DNA was composed of GACT nucleotide repeats, was the most widely accepted view of DNA’s composition. How did Chargaff disprove this hypothesis?The Bacteria Escherichia coli DNA genome has a molecular mass of about 3.1 X 109 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 mm?A duplex DNA molecule contains a random sequence of the four nucleotides with equal proportions of each. What is the average spacing between consecutive occurrences of the sequence 5'-ATGC-3'? Between consecutive occurrences of the sequence 5'-TACGGC-3'?
- What are the features that make the structure of the DNA stable? Explain why the DNA is the genetic material.The amount of G plus C in an organism’s DNA is 64% of the total base content of that DNA. What are the percentages of A, T, G, and C?If A represents 40% of the nucleotides in a particular piece of double stranded DNA, how often will the sequence GG appear? (You can say that GG would be expected to appear, on average, every _____ bases.) SHOW WORK!
- Given the structures of the nitrogenous bases shown in the picture, draw the structure of a part of DNA with the sequence: 5'-GTTCA-3'.The base composition of the DNAs from many organisms, especially microorganisms, varies widely. Yet the amino acid compositions of the proteins from organisms having very different DNA base compositions are very similar. What explanations can you suggest for this observation?Why does the blood from the peripheral, tumor and breast samples all show bands of DNA that are 3000 bases and 1282 bases long?