What do you mean by antiparallel nature of two chains of DNA.

Explanation

### Step-by-Step Solution:

1. **Definition of Antiparallel**: The term "antiparallel" refers to the orientation of the two strands of DNA in a double helix. In DNA, the two strands run in opposite directions.

2. **Structure of DNA**: DNA is structured as a double helix, which consists of two long chains (or strands) of nucleotides twisted around each other.

3. **Polarity of DNA Strands**: Each DNA strand has a directionality, which is defined by the carbon atoms in the sugar component of the nucleotides. The two ends of a DNA strand are referred to as the 5' (five-prime) end and the 3' (three-prime) end.

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