#Question id: 11735
#Unit 6. System Physiology – Plant
In cytokinin biosynthesis is the addition of the isopentenyl
side chain from DMAPP to an adenosine moiety. The plant and bacterial IPT
enzymes differ substrate used;
a) the bacterial enzyme utilizes AMP
b) the plant enzyme appears to utilize AMP
c) the bacterial enzyme utilizes both ADP and ATP
d) the plant enzyme appears to utilize both ADP and ATP
#Question id: 11736
#Unit 6. System Physiology – Plant
Many plant tissues contain the enzyme cytokinin oxidase, which cleaves the side chain, except
#Question id: 11737
#Unit 6. System Physiology – Plant
Cytokinins have been shown to have effects on many
physiological and developmental processes, including____
a)
Leaf senescence
b)
Apical dominance
c) Gametophytic
development
d) Vascular development
e)
Breaking of bud dormancy
f) Causing bud dormancy
#Question id: 11738
#Unit 6. System Physiology – Plant
The ribotide and riboside forms of trans-zeatin can be interconverted, and free trans-zeatin can be formed from the ribotide by the
#Question id: 11739
#Unit 6. System Physiology – Plant
which of the following compound is resist to cleave by cytokinin oxidase and why?
#Question id: 11807
#Unit 6. System Physiology – Plant
Given below are few statements regarding the cytokinin
signalling pathway;
a) Cytokinin inhibits the activation of a Cdc25- like
phosphatase, whose role is to remove an inhibitory phosphate group from the
Cdc2 kinase
b) Cytokinin oxidase irreversibly inactivates cytokinins,
and it could be important in regulating or limiting cytokinin effects
c) Cytokinin signal transduction pathway is completed on
multiple places such as ER, Cytosol and Nucleus
d) Elevation of endogenous cytokinin levels in transgenic
Arabidopsis results in overexpression of the KNOTTED homeobox transcription
factor homologs KNAT1 and STM—genes
Which of the following combinations from the given above statements is correct?