alleryStart learning →The chromophore of a phototropin is a covalently bound molecule of what?
AA carotene molecule
BA chlorophyll head
CA flavin molecule
DA tetrapyrrole ring
Answer & Solution
Correct answer: C. A flavin molecule
1. Phototropins are the protein based receptors that mediate the phototropic response to blue light.
2. Like all plant photoreceptors they have a protein portion and a light absorbing chromophore.
3. In phototropins that chromophore is a covalently bound molecule of flavin, which is why they are called flavoproteins.
4. A linear tetrapyrrole chromophore belongs to the phytochromes instead, so that option names the red light receptor.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.6 Plant Sensory Systems and Responses_
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