Question

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$\color{Red}{ᴡʜʏ ᴛʜᴇ ᴅɪsᴛᴀɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴛᴡᴏ ᴘᴏʟʏɴᴜᴄʟᴇᴏᴛɪᴅᴇ ᴄʜᴀɪɴs ɪɴ ᴅɴᴀ. ʀᴇᴍᴀɪɴ sᴀᴍᴇ ᴀʟᴡᴀʏs??? }$
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Answer 1

Answer:

The bases are connected by Hydrogen Bonds wherein a purein is always connected to a pyramidine which maintains the same distance throughout

Eg: adenine(purine) is bonded with thymine(pyramidine)

Answer 2

Tʜᴇ ʙᴀsᴇs ɪɴ ᴛᴡᴏ sᴛʀᴀɴᴅs ᴏғ DNA ᴀʀᴇ ᴘᴀɪʀᴇᴅ ᴛʜʀᴏᴜɢʜ ʜʏᴅʀᴏɢᴇɴ ʙᴏɴᴅ (H-ʙᴏɴᴅs) ғᴏʀᴍɪɴɢ ʙᴀsᴇ ᴘᴀɪʀs (ʙᴘ). Aᴅᴇɴɪɴᴇ ғᴏʀᴍs ᴛᴡᴏ ʜʏᴅʀᴏɢᴇɴ ʙᴏɴᴅs ᴡɪᴛʜ Tʜʏᴍɪɴᴇ ғʀᴏᴍ ᴏᴘᴘᴏsɪᴛᴇ sᴛʀᴀɴᴅ ᴀɴᴅ ᴠɪᴄᴇ-ᴠᴇʀsᴀ. ... As ᴀ ʀᴇsᴜʟᴛ ᴏғ ᴛʜᴇsᴇ ʙᴏɴᴅs, ᴛʜᴇ ᴅɪsᴛᴀɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴛᴡᴏ ᴘᴏʟʏɴᴜᴄʟᴇᴏᴛɪᴅᴇ ᴄʜᴀɪɴs ɪɴ DNA ʀᴇᴍᴀɪɴs ᴀʟᴍᴏsᴛ ᴄᴏɴsᴛᴀɴᴛ

Hope it helps...

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