Which of the following is the empirical formula of chlorophyll b?
Correct answer: C. C55H70O6N4Mg
- A. C55H70O5N4Mg
- B. C55H72O6N4Mg
- C. C55H70O6N4Mg
- D. C55H72O5N4Mg
Explanation
The molecular formula of chlorophyll b is C55H70O6N4Mg, with magnesium held in the porphyrin-like ring and six oxygen atoms present. Students often choose option a, the formula of chlorophyll a, which differs by having one fewer oxygen atom and two more hydrogen atoms.
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Conjugated molecules contain a non-protein component attached to a protein portion, giving the molecule properties that a simple protein lacks. The content includes glycoproteins, lipoproteins, phosphoproteins, nucleoproteins, chromoproteins and metalloproteins, with attention to their prosthetic groups and roles in transport, protection, catalysis and cellular structure.
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