Which of the following events occur when E. coli is starved for tryptophan?

I.  The ribosome translates leader peptide completely

II. Transcription reads through attenuator into trp EDCBA

III. Tryptophanyl tRNA is not formed

IV. A stem loop structure involving regions 3 and 4 is formed at attenuator site

TLS Online TPP Program

#Question id: 2599

#Unit 2. Cellular Organization

The mRNA from the trp operon has a half-life of only about____

TLS Online TPP Program

#Question id: 3993

#Unit 3. Fundamental Processes

An example of coordinate control is the down-regulation of ribosomal RNA synthesis in response to amino acid starvation, which will cause synthesis of ribosomal proteins to be limited.  What is the correct order of the following events that participate in the signaling process?

1. Binding of stringent factor to the ribosome.

2. Formation of the unusual nucleotide ppGpp.

3. Formation of the unusual nucleotide pppGpp.

4. Uncharged tRNA binds in the ribosomal A-site.

TLS Online TPP Program

#Question id: 30071

#Unit 7. System Physiology – Animal

According to graph, match the following:

TLS Online TPP Program

#Question id: 1915

#Unit 4. Cell Communication and Cell Signaling

Of the following, which is the cadaveric organ with the best survival 5-years post-transplant?

TLS Online TPP Program

#Question id: 33105

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of following statement is/are correct

A. Some weak interactions are formed in the ES complex, 

B. Full complement of such interactions between substrate and enzyme is formed only when the substrate reaches the transition state.

C. Induced fit model best explains binding of substrate in transition state

D. Binding energy concept of catalysed reaction is best suits to induced fit model