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Question

Phytochrome is a:


A

Chromoprotein

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B

Flavoprotein

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C

Lipoprotein

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D

Glycoprotein

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Solution

The correct option is A

Chromoprotein


The correct option is A.

Explanation of the correct answer:

  1. Phytochrome is a chromoprotein.
  2. It acts as a photoreceptor in plants.
  3. It is sensitive to light in the red and far-red regions.
  4. Phytochromes regulate processes linked with photoperiods like flowering, seed germination, chlorophyll synthesis, etc.

Explanation of the incorrect options:

Option B:

  1. Phytochrome is a chromoprotein, not a flavoprotein.
  2. Flavoproteins are oxidative enzymes containing FAD.
  3. They help in photosynthesis and DNA repair.

Option C:

  1. Phytochrome is a chromoprotein, not a lipoprotein.
  2. Lipoproteins carry cholesterol through the bloodstream.

Option D:

  1. Phytochrome is a chromoprotein, not a glycoprotein.
  2. Glycoproteins are proteins containing glycans attached to an amino acid side-chain.
  3. It helps in immunity.

Final answer: Phytochrome is a chromoprotein.


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