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TLS Online TPP Program
#Question id: 12407
#Unit 6. System Physiology – Plant
ABA is synthesized via _____A________, the biosynthetic processes occur in_____B_____and ____C_____.
TLS Online TPP Program
#Question id: 12408
#Unit 6. System Physiology – Plant
Cleavage of the carotenoid by the enzyme NCED (9-cis-epoxycarotenoid dioxygenase) is a rate-limiting highly regulated step in ABA synthesis that produces the 15-carbon precursor molecule xanthoxin in
TLS Online TPP Program
#Question id: 12409
#Unit 6. System Physiology – Plant
The Chemical Structure of ABA Determines Its Physiological Activity, 15 carbon compound
a) The orientation of the carboxyl group at carbon 2 determines the cis and trans isomers of ABA. Nearly all the naturally occurring ABA is in the cis form
b) S enantiomer is the natural form; commercially available synthetic ABA is a mixture of approximately equal amounts of the S and R forms.
c) The S enantiomer is the only one that is active in fast responses to ABA, such as stomatal closure
d) In long-term responses, such as seed maturation, only R-enantiomers are active
e) In contrast to the cis and trans isomers, the S and R forms cannot be interconverted in the plant tissue
Which of the following is the correct prediction about the active form of ABA?
TLS Online TPP Program
#Question id: 12410
#Unit 6. System Physiology – Plant
Precursor of the ABA is___
TLS Online TPP Program
#Question id: 12515
#Unit 6. System Physiology – Plant
The most widely used techniques allows detection of as little as 10^13 g ABA by
TLS Online TPP Program
#Question id: 12516
#Unit 6. System Physiology – Plant
ABA Is Synthesized from a Carotenoid Intermediate is takes place in___