Practice question
Question
Phytochrome photoreceptors exist in two isoforms, Pᵣand PFᵣ . Following are certain statements regarding the function of PFᵣ : A. PFᵣ form induces phosphorylation and ubiquitin linked degradation of PIFs transcription factor. B. PFᵣ mediated degradation of PIFs inhibits photomorphogenesis. C. PFᵣinhibits the activity of COPI. D. PFᵣ increases the stability of transcription factors HFR 1, HY5 and LAF1. Which one of the following combinations is correct?
Explanation
In phytochrome photoreceptors exist in two isoforms, pᵣand, A, C and D only represents established outcome. functional assays confirms option B (A, C and D only) as correct, while alternatives misstate substrate or regulatory direction, contradicting textbook data.
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