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The two polynucleotide chains in DNA are
A. Parallel
B. Discontinuous
C. Antiparallel
D. Semi-conservative

Answer
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Hint: In DNA, the opposite strands contain complementary bases. In a double-stranded DNA, one strand runs in the 53 direction while the other runs in 35i.e. the reverse direction.

Complete answer: DNA forms a double helix and nucleotides form the structural base of it. DNA has two strands with complementary nitrogen bases.
One of these strands runs in 35direction while the other runs in the reverse direction 53. They run in opposite directions but remain parallel.
In other words, the two polynucleotide chains are antiparallel to each other.
Their nitrogen bases project inward; these are joined by hydrogen bonds.
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So, the correct option is C. Antiparallel

Note: DNA is a nucleic acid chain composed of deoxyribose sugar.
Francis Crick, J.D. Watson along with Rosaline Franklin had prepared a three-dimensional DNA model.
The antiparallel strands of DNA twist around a common axis to form the complete three-dimensional DNA structure- the double helix. It is known as the staircase model.
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