Oxidation of iodine is mediated by thyroid peroxidase, a membrane-bound enzyme found in the thyrocyte apical membrane.

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#Id: 4576

#Unit 6. System Physiology – Plant

Function of light

a) Development

b) Photosynthesis

c) Stomata opening

d) Flowering

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#Id: 4577

#Unit 6. System Physiology – Plant

Light wavelengths detected by plant light receptors.

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#Id: 4578

#Unit 6. System Physiology – Plant

Phytochrome Can Interconvert between Pr and Pfr Forms

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#Id: 4579

#Unit 6. System Physiology – Plant

Effects of red light (650–680 nm) on morphogenesis could be reversed by a subsequent irradiation with light of longer wavelengths (710–740 nm), called far-red light. This phenomenon was first demonstrated in germinating seeds.

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#Unit 6. System Physiology – Plant

In dark-grown or etiolated plants, phytochrome is present in a red light–absorbing form, referred to as Pr because it is synthesized in this form.

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#Id: 4581

#Unit 6. System Physiology – Plant

Pr, which to the human eye is blue, is converted by red light to a far-red light–absorbing form called Pfr, which is bluegreen.