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TLS Online TPP Program

#Id: 165


First inducers of the lens are foregut endoderm and cardiac mesoderm that underlie the lens-forming ectoderm during the early and mid gastrula stages.


#Unit 5. Developmental Biology #AMPHIBIA #Part B Pointers
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TLS Online TPP Program

#Id: 607

#Unit 2. Cellular Organization

The E. coli trp operon contains the 5 genes Trp-EDCBA for the anabolic enzymes to make the tryptophan.

TLS Online TPP Program

#Id: 608

#Unit 2. Cellular Organization

Major enzyme is Tryptophan Synthase


TLS Online TPP Program

#Id: 609

#Unit 2. Cellular Organization

Major enzyme is Tryptophan Synthase whose activity is reduced when trp concentration is high.
 

TLS Online TPP Program

#Id: 610

#Unit 2. Cellular Organization

Trp operon is negatively regulated by two ways
1. Repression
2. Attenuation
Why is this extra control of two layers on trp operon needed? 

TLS Online TPP Program

#Id: 611

#Unit 2. Cellular Organization

The answer probably lies in the fact that repression of the trp operon is weak—much weaker.

TLS Online TPP Program

#Id: 612

#Unit 2. Cellular Organization

Repression-Trp aporepressor dimer binds high tryptophan, changes conformation with high affinity for trp operator Tryptophan is a corepressor
 

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