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Protochlorophyll differs from chlorophyll in lacking:

1. 2 hydrogen atoms in one of its pyrrole rings
2. 2 hydrogen atoms in two of its pyrrole rings
3. 4 hydrogen atoms in one of its pyrrole rings
4. 4 hydrogen atoms in two of its pyrrole rings

Correct answer: 2 hydrogen atoms in one of its pyrrole rings

Solution

Protochlorophyll differs from chlorophyll by having one less reduced pyrrole ring. That means it lacks 2 hydrogen atoms in one pyrrole ring, which changes the ring from a more saturated to a less saturated form.

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