Bio Chemistry Question:
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According to the Watson - Crick Model how many polynucleotide chains does a DNA molecule has?

Answer:

The DNA molecule is formed by two polynucleotide chains bound in antiparallel mode (5’-3’ to 3’-5’) and forming a helical structure.

Nucleic Acid Review - Image Diversity: DNA double helix

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Who were James Watson, Francis Crik and Maurice Wilkins?What is the rule for the pairing of nitrogen-containing bases in the DNA molecule and in the RNA? Is this last question appropriate?