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TLS Online TPP Program

#Question id: 10365

Why the nitrogenase enzymes catalyzes the nitrogen fixation reaction only in microanaerobic or anaerobic conditions?

#Unit 6. System Physiology – Plant
  1. O2 form ROS (reactive oxygen species) that inhibits the enzyme nitrogenase
  2. Oxygen, being a strong electron acceptor, can damage these sites and irreversibly inactivate nitrogenase, so nitrogen must be fixed under anaerobic conditions
  3. Because lack a PSI, the oxygen-producing photosystem of chloroplasts, so they do not generate oxygen
  4. nitrogenase enzymes only active in anaerobic environment and inhibit in the aerobic environment due to O2
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TLS Online TPP Program

#Question id: 12635

#Unit 6. System Physiology – Plant

What is the role of BSK in Brassinosteroid signal transduction pathway?
TLS Online TPP Program

#Question id: 12632

#Unit 6. System Physiology – Plant

In brief, brassinolide binding to the brassinosteroid receptor kinase present on the plasma membrane, these brassinosteroid receptor kinase is,
TLS Online TPP Program

#Question id: 12627

#Unit 6. System Physiology – Plant

Strigolactones are synthesized from β-carotene,  synthesis of the intermediate carlactone, beyond which strigolactone biosynthesis diverges is takes place____
a) in a species-specific manner
b) in Non-species specific manner
c) Divergence is attributed to the functional diversity of MAX1 cytochrome P450 isoforms, which act on carlactone
d) Divergence is attributed to the functional diversity of MAX1 cytochrome P450 isoforms, which act on 5-Deoxystrigol
Which of the following combination from the above statement is true?
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: 12517

#Unit 6. System Physiology – Plant

Synthesis of violaxanthin is catalyzed by an enzyme known as__
TLS Online TPP Program

#Question id: 12520

#Unit 6. System Physiology – Plant

During the biosynthesis of precursor All-trans-β-carotene is isomerized to 9-cis-β-carotene by ____A_____While 9-cis-β-Carotene is cleaved by carotenoid cleavage_____B_______ to produce_____C______.