TLS Online TPP Program

#Question id: 2014


Some pathogens can undergo rapid changes resulting in antigenic variation. Which of the following is such a pathogen?

#Unit 4. Cell Communication and Cell Signaling
  1. the influenza virus, which expresses alternative envelope proteins

  2. the strep bacteria, which can be communicated from patient to patient with high efficiency

  3. human papilloma virus, that can remain latent for several years

  4. the causative agent of an autoimmune disease such as rheumatoid arthritis

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TLS Online TPP Program

#Question id: 4679

#Unit 3. Fundamental Processes

Activated RecA stimulates autocleavage of

TLS Online TPP Program

#Question id: 4680

#Unit 3. Fundamental Processes

A protein is a transcriptional activator,  which binds to a site upstream of a promoter called PRE and stimulates transcription of the cI (repressor) gene. This activator protein is

TLS Online TPP Program

#Question id: 4681

#Unit 3. Fundamental Processes

The promoters whose activities are controlled by products of the genes transcribed from PR and PL

TLS Online TPP Program

#Question id: 4682

#Unit 3. Fundamental Processes

what will happen, when repressor bound at OR1 and OR2,

TLS Online TPP Program

#Question id: 4683

#Unit 3. Fundamental Processes

A very unstable protein in E. coli; it is degraded by a specific protease called FtsH (HflB), encoded by the hfl gene.

TLS Online TPP Program

#Question id: 4684

#Unit 3. Fundamental Processes

The depicted region contains two genes (cI and cro) and three promoters (PR, PL, and PRM), these promoters are direct the transcription such as;

a) PR and PL are is a weak promoter and only directs efficient transcription when an activator is bound just upstream

b) PR and PL are strong, constitutive promoters, they bind RNA polymerase efficiently and direct transcription without     help from an activator

c) PRM, is a weak promoter and only directs efficient transcription when an activator is bound just upstream

d) PRM are strong, constitutive promoters, they bind RNA polymerase efficiently and direct transcription without help from an activator

Which of the following from the above combination is correct ?