Which part of chlorophyll molecule absorbs light?
Correct answer: B. Porphyrin ring
- A. Phytol
- B. Porphyrin ring
- C. Pyrrole
- D. Thylakoid membrane
Explanation
The part of the chlorophyll molecule that absorbs light is the porphyrin ring, which is a complex cyclic structure containing a centrally coordinated magnesium ion (Mg2+). The porphyrin ring is responsible for the pigment's ability to absorb light energy during the process of photosynthesis. The porphyrin ring consists of alternating single and double bonds, creating a conjugated system. This conjugated system allows chlorophyll to absorb light in the visible spectrum.The absorption of light by chlorophyll is most efficient in the blue and red regions of the electromagnetic spectrum.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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