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TLS Online TPP Program

#Question id: 7105

The "default model" for neural tissue formation states that

#Unit 5. Developmental Biology
  1. No mechanism is required to form nervous tissue in the embryo; it forms unless signals direct development of epidermal tissue.
  2. Neural tissue formation is the default state, such that special induction is required to form mesoderm, endoderm and epidermis, but not neurectoderm.
  3. Neurectoderm formation is inhibited by the BMP proteins present throughout the early embryo, and this inhibition is relieved by BMP antagonists from the organizer, such as chordin
  4. The induction of neural tissue is the default state in embryos, and all other inductions are special.
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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?
TLS Online TPP Program

#Question id: 12410

#Unit 6. System Physiology – Plant

Precursor of the ABA is___