TLS Online TPP Program

#Question id: 733


Which one of the statements on protein conformation, detailed below is INCORRECT?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. All types of B turns exist with both positive and negative dihydral angle values.

  2. PPII or PGII helix are found in proteins but they are not considered as equivalent secondary structure elements.

  3. Dihydral angles of extended peptide chain exist near 0o point in Ramachandran plot.

  4. PPII helices are stabilized by main chain-water hydrogen bonds

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TLS Online TPP Program

#Question id: 4518

#Unit 3. Fundamental Processes

The sequence of transcriptional activation events at a typical Pol II promote

I- Mediator facilitates the binding of TBP (or TFIID) and TFIIB, and the other basal transcription factors and Pol II then bind.

II- Activators bind the DNA.

III-The activators recruit the histone modification/nucleosome remodeling complexes and a coactivator such as Media.

IV- Phosphorylation of the carboxyl-terminal domain (CTD) of Pol II leads to transcription initiation.

TLS Online TPP Program

#Question id: 4519

#Unit 3. Fundamental Processes

Some steroid hormone receptors function in the nucleus as transcription activators, stimulating the transcription of certain genes when a particular steroid hormone signal is present. When the hormone is absent, the receptor proteins revert to a repressor conformation, preventing the formation of PICs. It is an example of;

TLS Online TPP Program

#Question id: 4520

#Unit 3. Fundamental Processes

Interaction of two regulatory proteins is often mediated by domains containing

TLS Online TPP Program

#Question id: 4521

#Unit 3. Fundamental Processes

Three distinct types of structural domains used in activation by transcription activators, except one

TLS Online TPP Program

#Question id: 4522

#Unit 3. Fundamental Processes

Gal4p contains a

TLS Online TPP Program

#Question id: 4524

#Unit 3. Fundamental Processes

Sp1 is a transcription activator for a large number of genes in higher eukaryotes. Its DNA-binding site, choose incorrect statement