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TLS Online TPP Program

#Question id: 4458

What structural changes will occur at the time of transition to the open complex and  how we describe this transition in transcription,

#Unit 3. Fundamental Processes

  1. Melting occurs between positions –11 and +2, with respect to the transcription start site.

  2. In the case of the bacterial enzyme bearing s70, this transition, often called isomerization.

  3. It requires energy derived from ATP hydrolysis and is instead the result of a nonspontaneous conformational change in the DNA– enzyme complex to a more energetically favorable form.

  4. Only A and B

More Questions
TLS Online TPP Program

#Question id: 12404

#Unit 6. System Physiology – Plant

Covalent conjugation of amino acids to IAA can result in___
TLS Online TPP Program

#Question id: 12405

#Unit 6. System Physiology – Plant

Sequestration of auxin in endomembrane compartments, primarily in the__
TLS Online TPP Program

#Question id: 12406

#Unit 6. System Physiology – Plant

The β-oxidation of indole-3-butyric acid (IBA) to IAA takes place in___
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?