Short Answer TypeGroup the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.
Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesised from it (DNA or RNA), list the types of nucleic acid polymerases.
Name the scientist who suggested that the genetic code should be made of a combination of three nucleotides.
In which phase of the cell cycle does replication occur in Eukaryotes? What would happen if cell-division is not followed after DNA replication?
A DNA segment has a total of 1000 nucleotides, out of which 240 of them are adenine containing nucleotides. How many pyrimidine bases this DNA segment possesses?
According to Chargaff’s base pairing rule, The ratio of purines (A and G) to pyrimidines (C and T) is equal.
Thus, the number of adenine (A) will be equal to the number of thymine (T).
Therefore, if the number of A is 240, T will also be 240 as A = T
Thus A + T = 240 + 240 = 480
The number of cytosine (C) will be equal to the number of guanine (G).
Thus, G + C = Total number of nucleotides - Nucleotides containing A and T = 1000 - 480 = 520
Since G = C = 260 (520 divided by 2)
Thus, the number of pyrimidines that the segment possess = C + T
= 260 + 240 = 500
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