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Q.

The polarity of the DNA strands from a to b and from c to d shown during replicating shown in the figure below would be:

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a

a – b  5’ - 3’  c – d 5’ - 3’

b

a – b  3’ - 5’  c – d  5’ - 3’ 

c

a – b  3’ - 5’  c – d  3’ - 5’

d

a – b  5’ - 3’  c – d  3’ - 5’

answer is A.

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Detailed Solution

The polarity of DNA template on which the leading strand is formed must be 3' — 5' and the other one on which the lagging strand with okazaki fragments are formed must be 5' ----- 3'. 

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