In chlorophyII-b, the porphyrine ring is attached to the:

Correct answer: C. Aldehyde group

  • A. Methyl group
  • B. Carboxyl group
  • C. Aldehyde group
  • D. Hydroxyl group

Explanation

The porphyrin ring in chlorophyll-b is specifically attached to an aldehyde group, which includes a carbonyl group (C=O) bonded to a hydrogen atom. This distinguishes it from chlorophyll-a, where the attachment is a methyl group. Methyl groups (CH3) are simple carbon groups not present in chlorophyll-b's structure. Carboxyl groups (COOH) and hydroxyl groups (OH) are not involved in the attachment of the porphyrin ring in chlorophyll-b.

This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.

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