#Question id: 11732
#Unit 6. System Physiology – Plant
Cytokinins are defined as compounds that have biological
activities similar to those of trans-zeatin. These activities include the
ability to do the following:
a) Induce cell division in callus cells in the presence of
an auxin
b) Promote bud or root formation from callus cultures when
in the appropriate molar ratios to auxin
c) promote senescence of leaves
d) Promote expansion of dicot cotyledons
Which one of the following activities are incorrect?
#Question id: 11733
#Unit 6. System Physiology – Plant
The synthetic cytokinin compounds that have not been identified in plants, these are;
#Question id: 11734
#Unit 6. System Physiology – Plant
Some molecules act as cytokinin antagonists, which are able to block the action of cytokinins that is
#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