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ICSE Class X Biology 2013 Solved Papers

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Question : 90
Total: 90
Write the names of four nitrogenous bases in a DNA molecule.
Solution:  
Nitrogenous bases of DNA molecules :
(a)‌Adenine
(b)‌Guanine
}‌Purines
(c)‌Cytosine
(d)‌Thymine
}‌Pyrimidines
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