Identify the nitrogenous bases of the purine and pyrimidine types.
- APurine $= C, T, U$; Pyrimidine $= A, G$
- BPurine $= G, C, U$; Pyrimidine $= A, T$
- CPurine $= A, T$; Pyrimidine $= G, C, U$
- DPurine $= A, G$; Pyrimidine $= C, T, U$
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Identify the correct features of $DNA$ from the following statements:
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(ii) The backbone is constituted by sugar and phosphate.
(iii) The two chains have anti-parallel polarity.
(iv) The bases in the two strands are linked through $H$-bonds.
$(v)$ Both chains are coiled in a right-handed fashion.
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