Two runners A and B start running from diametrically opposite points on a circular track in the same direction. If A runs at a constant speed of 8 km/h and B at a constant speed of 6 km/h and A catches up with B in 30 minutes , what is the length of the track?

TLS Online TPP Program

#Question id: 3991

#Unit 3. Fundamental Processes

Attenuation in the trp operon of E. coli:

TLS Online TPP Program

#Question id: 3992

#Unit 3. Fundamental Processes

RecA protein provides the functional link between DNA damage and the SOS response by displacing the LexA protein from its operator sites on the SOS genes.  RecA does so by:

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: 3994

#Unit 3. Fundamental Processes

Which one of the following statements about eukaryotic gene regulation is correct?

TLS Online TPP Program

#Question id: 3995

#Unit 3. Fundamental Processes

Which is matched incorrectly?

TLS Online TPP Program

#Question id: 3996

#Unit 3. Fundamental Processes

What does it mean to say that the most common type of promoter in E. coli is bipartite?