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Q.

Reason for structural and chemical stability of DNA are 
I) Ribose sugar 
II) Double stranded 
III) Deoxy ribose sugar 
IV) Single stranded 
V) Having thymine in place of uracil

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a

I, II, III only  

b

II, III, V only 

c

III, IV, V only 
 

d

II, III, IV only

answer is A.

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Detailed Solution

Reasons for the structural and chemical stability of DNA are 
II) Complementarity and double stranded.
III) Presence of Deoxy ribose sugar where there is no oxygen at the 2' end.
V) Having thymine in place of uracil.

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