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MDCAT
Biology
2021

Biology · Bioenergetics

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

Chlorophyll molecule contains which ion as a central metal ion?

Options
  • A

    Fe²⁺

  • B

    Zn²⁺

  • C

    Cu²⁺

  • D

    Mg²⁺

Explanation

Magnesium is the central atom in a chlorophyll molecule, essential for its function in photosynthesis. It is crucial for chlorophyll's function in photosynthesis, as it helps the pigment absorb light energy and is essential for energy transfer and electron donation within the photosystem

Fe²⁺ is the central metal ion in haem molecule. Fe²⁺ Iron is a component of cytochromes and other proteins involved in electron transport, but it's not the central ion in chlorophyll.

This is the incorrect option. Zn²⁺: Zinc is a micronutrient involved in various enzymatic processes in plants, but it does not play a role in chlorophyll structure.

This is the incorrect option. Cu²⁺: Copper is a component of plastocyanin, which is involved in electron transfer in photosynthesis, but it is not the central ion in chlorophyll.

The chlorophyll molecule contains a central Mg²⁺ ion. Mg²⁺: Magnesium is the central atom in a chlorophyll molecule, essential for its function in photosynthesis.

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Tagged under Biology · Bioenergetics · 2021