#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: 11740
#Unit 6. System Physiology – Plant
Some given characteristics of the two types of sieve elements in seed plants such as Sieve tube elements and Sieve cells. Find out the true characteristics of sieve tube elements from the given statements;
i) Found in angiosperms
ii) Sieve plate pores are open channels
iii) Albuminous cells sometimes function as companion
cells
iv) P-protein is present in all eudicots and many
monocots
v) There are no sieve plates; all sieve areas are similar