#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?
#Question id: 11830
#Unit 6. System Physiology – Plant
Not all the ACC found in the tissue is converted to ethylene, ACC can also be converted to a conjugated form, which does not appear to break down and accumulates in the tissue?
#Question id: 11831
#Unit 6. System Physiology – Plant
A volatile compound is a strong competitive inhibitor of ethylene binding______
#Question id: 11832
#Unit 6. System Physiology – Plant
Ethylene production and action can be inhibited by various types of inhibitors, some statements about the inhibitor is given below, which one of the following is incorrect?
#Question id: 11833
#Unit 6. System Physiology – Plant
Analysis of mRNA from tomato fruits from wild-type and
transgenic tomato plants genetically engineered to lack ethylene has revealed
that gene expression during ripening is regulated by at least two independent
pathways;
I) Ethylene-dependent pathway
II) Ethylene-independent pathway
Some given genes involved in these two pathways,
a) ACC oxidase
b) respiratory metabolism
c) ACC synthase
d) chlorophyllase
e) lycopene and aroma biosynthesis
Which of the following is the correct combination from the given pathways and its included genes?