alleryChlorophyll structure contains:
AZinc
BCalcium
CMg²⁺ at center of porphyrin ring with long phytol tail
DIron
Answer & Solution
Correct answer: C. Mg²⁺ at center of porphyrin ring with long phytol tail
**Chlorophyll:** porphyrin ring (4 pyrroles) with Mg²⁺ at center (cf. heme has Fe).
Long phytol hydrocarbon tail anchors in thylakoid membrane.
The Mg-porphyrin ring system is responsible for absorbing light.
Slight differences between Chl a (methyl) and Chl b (formyl group) at one position shift the absorption spectrum.
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