Bacteriochlorophyll differs from chlorophyll a and b in structure and function. Which of the following statements correctly contrasts these types of chlorophyll?
A) Bacteriochlorophyll has a heme ring, but chlorophyll a and b each have a porphyrin ring.
B) Chlorophyll a and b each have a phytol side chain, which is missing from bacteriochlorophyll.
C) Chlorophyll a has a methyl group attached to the porphyrin ring, but bacteriochlorophyll has a formyl group.
D) Bacteriochlorophyll has a saturated carbon–carbon bond at one location in the porphyrin ring that is not saturated in chlorophyll a and b.
E) Chlorophyll a and b porphyrin rings bind Mg2+, but the bacteriochlorophyll ring binds Fe3+.
Answer: D
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