NEET 2006 Biology question

Antiparallel strands of a DNA molecule means that-

(1)One strand turns anti-clockwise
(2)The phosphate groups of two DNA strands, at their ends, share the same position
(3)The phosphate groups at the start of two DNA strands are in opposite position (pole)Correct
(4)One strand turns clockwise

Answer: (3)

Solution

In the double helix the two polynucleotide chains run in opposite directions: one has the 5' to 3' polarity while its complementary strand runs 3' to 5'. Thus the 5' phosphate end of one strand lies at the same end of the helix as the 3' hydroxyl end of the other, i.e.

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Question ID VK-089706