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ICSE Class X Biology 2013 Papers

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Question : 90 of 90
Marks: +1, -0
Write the names of four nitrogenous bases in a DNA molecule.
Solution:  
Nitrogenous bases of DNA molecules :
(a) Adeninetext(b)Guanine}Purines\left.\begin{array}{r}\text{(a) Adenine}\\text{(b) Guanine}\end{array}\right\}\text{Purines}
(c) Cytosinetext(d)Thymine}Pyrimidines\left.\begin{array}{r}\text{(c) Cytosine}\\text{(d) Thymine}\end{array}\right\}\text{Pyrimidines}
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