Question

58) Edwin Chargaff discovered that the nucleotide composition of DNA varies from one species to another. However, nucleotide composition always follows certain rules. Use these rules to make deductions about the structure of a particular DNA molecule by completing the table below. Nucleotide Presence in DNA sample (%) Adenine Cytosine Guanine thymine 59) Using the data from the table above to draw a stretch of a double-stranded DNA molecule that is 20 base pairs long (hint: in the table above, do you have more A-Ts or C-Gs? Make sure your drawing follows the percents above). Use solid lines to show chemical bonds and dotted lines to show hydrogen bonds.

Answer 1

Answer to question number 58)

# According to Know that Chargaff's rule we 1) Adenine makes bond with Thymine. 2) Guanine makes bond with cytosine. Also, DNA from any cell of any organism should have 1:9 ratio of pyrimidine and purine bases. & more specifically, The amount of be equal to The amount be equal to quanine should cytosine of adenine should thymine In the above that Amount question it is given adenine z 31%. of - As, we know amount of adenine is equal to amount of thymine 2 Amount of thy mine = 31% - Now, since amount - sum up to 62%. of adenine & thym Lie, 31% +31%). - 100-62 38 1 of the amount is constituted by quanine & cytosine And go as Amount 2 38 of 19 / so, Amount of Adenine = 317 Guanine z 197. Thymine a 317 Cytosine 19%.