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Question
A short length of DNA molecule has 80 thymine and 80 guanine bases. The total number of nucleotids in the DNA fragment is
A short length of DNA molecule has 80 thymine and 80 guanine bases. The total number of nucleotids in the DNA fragment is
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Solution
The correct option is C 320
According to Chargaff’s rule, in all cellular DNAs, regardless of the species, number of adenosine residues is equal to number of thymidine residues which means that A=T; and the number of guanosine residues is equal to the number of cytidine residues (G= C). Hence, that the sum of the purine residues equals the sum of the pyrimidine residues, i.e., A + G = T + C.Hence, a DNA strand with 80 thymine and 80 guanine bases will have 80 adenine and 80 cytosine bases. This makes total 80+80+80+80 = 320 bases and therefore, 320 nucleotides in that DNA molecule. Thus, the correct answer is option D.
According to Chargaff’s rule, in all cellular DNAs, regardless of the species, number of adenosine residues is equal to number of thymidine residues which means that A=T; and the number of guanosine residues is equal to the number of cytidine residues (G= C). Hence, that the sum of the purine residues equals the sum of the pyrimidine residues, i.e., A + G = T + C.
Hence, a DNA strand with 80 thymine and 80 guanine bases will have 80 adenine and 80 cytosine bases. This makes total 80+80+80+80 = 320 bases and therefore, 320 nucleotides in that DNA molecule. Thus, the correct answer is option D.
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