Practice question
Question
Following statements are made regarding the biosynthesis of phytohormones. A. Indole-3-butyric acid is converted to IAA by β-oxidation in peroxisomes. B. The gibberellin precursor, geranyl geranyl diphosphate is synthesized in the plastids. C. Cytokinins are synthesized from adenine nucleotides and dimethylallyl diphosphate in the mitochondria. D. The oxidative reactions that convert xanthoxin to abscisic acid occur in the cytosol. E. Cytochrome P450 monooxygenase enzyme family associated with endoplasmic reticulum catalyzes most of the reactions in brassinosteroid biosynthesis. Which one of the following combinations contains all correct statements?
Explanation
Analysis of following statements are made regarding the biosynthesis shows NCED produces xanthoxin, CYP707A3 catabolizes ABA, glucosyltransferase conjugates, β-glucosidase releases active ABA. pathway matching supports option B, whereas distractors confuse reversed enzyme functions and fail to reproduce observed results.
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