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02/09/2021 7:50 pm
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Protochlorophyll differs from chlorophyll in lacking
(1) 4 hydrogen atoms in one of its pyrrole rings
(2) 2 hydrogen atoms in one of its pyrrole rings
(3) 4 hydrogen atoms in two of its pyrrole rings
(4) 2 hydrogen atoms in two of its pyrrole rings
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02/09/2021 7:51 pm
(2) 2 hydrogen atoms in one of its pyrrole rings