Which one of the following statements is true regarding the magnesium porphyrin ring and the phytol chain of a chlorophyll molecule?
Which one of the following statements is true regarding the magnesium porphyrin ring and the phytol chain of a chlorophyll molecule?
Select an option to attempt
Correct Answer: Option D
Explanation
Chlorophyll molecule structure and amphiphilicity: The magnesium-porphyrin (chlorin ring) head group: the tetrapyrrole macrocycle with Mgat the centre; has conjugated double bonds enabling light absorption; the ring system is polar/hydrophilic due to polar carbonyl, ester, and ring nitrogen groups — interacts with protein amino acid residues in the photosystem. The phytol chain tail: a long () isoprenoid alcohol (-phytol), highly saturated, linear hydrophobic chain — provides the lipophilic anchor that inserts chlorophyll into the non-polar hydrophobic core of the thylakoid membrane phospholipid bilayer. This amphiphilic structure (polar head + hydrophobic tail) is essential for chlorophyll's correct orientation in photosystems I and II.