#Question id: 11824
#Unit 6. System Physiology – Plant
Only two of the ethylene receptors in Arabidopsis have intrinsic histidine kinase activity, these receptors are_______
#Question id: 11825
#Unit 6. System Physiology – Plant
Ethylene receptors are localized into the______
#Question id: 11826
#Unit 6. System Physiology – Plant
Some given statements about ethylene signalling pathways are
listed;
a) Ethylene receptors are interact with two downstream
signaling proteins, CTR1 (CONSTITUTIVE TRIPLE RESPONSE1) and EIN3
(ETHYLENE-INSENSITIVE3)
b) CTR1 is a soluble serine/threonine kinase that is
associated with ethylene receptors, while EIN2 is an ER transmembrane protein
with a cytosolic C-terminal domain that is a target for CTR1 kinase activity
c) EIN2 is required to stabilize transcription factors of
the EIN3 (ETHYLENEINSENSITIVE3) family, which activate the transcription of
ethylene-responsive genes
d) EIN3 is required to stabilize transcription factors of
the EIN2 (ETHYLENEINSENSITIVE2) family, which activate the transcription of
ethylene-responsive genes
Which of the following is the correct statements of auxin signalling pathway ?
#Question id: 11827
#Unit 6. System Physiology – Plant
Which of the following enzyme is involved in the rate-limiting step in ethylene biosynthesis?
#Question id: 11828
#Unit 6. System Physiology – Plant
Given some enzymes of ethylene biosynthetic pathway and its
character;
A) ACC
synthase i)
It is an unstable, cytosolic enzyme. Its level is regulated by environmental
and internal factors, such as wounding, drought stress, flooding, and auxin
B) ACC
oxidase ii)
It catalyzes the last step in ethylene biosynthesis, the conversion of ACC to
ethylene
iii)
Its activity can be the rate-limiting step in ethylene biosynthesis
iv)
That is encoded by a multigene family that is differentially regulated
v)
It is present in such low amounts in plant tissues and is very unstable and
also difficult to purify the enzyme for biochemical analysis
vi)
These enzymes belong to the Fe2+/ascorbate oxidase superfamily
Find out the correct combination from the given enzymes and its character?
#Question id: 11829
#Unit 6. System Physiology – Plant
The certain cyclic olefin compounds, have been shown to block ethylene breakdown without inhibiting ethylene action?