Biology, 02.10.2020 21:01 jedmnlp5xuks

Why does adenine always pair with thymine and guanine always pair with cytosine? What two factors determine the base pairing rule? 1.) space between nitrogenous bases and the opportunity for metallic bonding
2.) space between nitrogenous bases and opportunity for covalent bonds
3.) space between nitrogenous bases and opportunities for hydrogen bonding
4.) space between nitrogenous bases and the opportunity for ionic bonding

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