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TLS Online TPP Program

#Question id: 465

If the standard reduction potential of a certain half-reaction is -0.30 V, which statement below is true for this half-reaction to proceed as a reduction?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. This half-reaction will proceed if it is coupled to another half-reaction that has a standard reduction potential greater than +0.30 V.

  2. This half-reaction will proceed if it is coupled to another half-reaction that has a standard reduction potential greater than -0.0V 

  3. This half-reaction will proceed if it is coupled to another half-reaction that has a standard reduction potential less than -0.30 V.

  4. It doesnʹt matter what half-reaction this is coupled with, it will proceed spontaneously.

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TLS Online TPP Program

#Question id: 4265

#Unit 3. Fundamental Processes

48S pre initiation complex includes
TLS Online TPP Program

#Question id: 4266

#Unit 3. Fundamental Processes

48S pre initiation complex is
TLS Online TPP Program

#Question id: 4267

#Unit 3. Fundamental Processes

The 3D structure of the complete Escherichia coli ribosome with bound mRNA and tRNAs revealed that the very amino terminus of one protein (L27) does reach into the active site. This finding suggested a role for this protein in catalysis. To test this possibility, the nine amino acids at the L27 amino terminus that were in close proximity to the active site were eliminated by mutation. The following possible outcomes were found to be correct as

A. The resulting cells produced ribosomes with reduced but detectable peptidyl transferase activity

B. Region of the L27 protein contributes to peptidyl transferase activity

C. The mutant ribosomes, didn’t synthesised wildtype levels of cells

D. Vast majority of this increase in peptide bond formation is retained, even without the presence of L27 in the active site

E. The most likely role for L27 is to correctly position one or more of the RNA components of the active site
TLS Online TPP Program

#Question id: 4268

#Unit 3. Fundamental Processes

23S rRNA catalyze peptide-bond formation as

A. base pairing between the 23S rRNA and the CCA ends of the tRNAs

B. A- and P-sites positions the a-amino group of the aminoacyl-tRNA to attack the carbonyl group of the growing polypeptide attached to the peptidyl-tRNA

C. Entropic catalysis is involved
TLS Online TPP Program

#Question id: 4269

#Unit 3. Fundamental Processes

The kinase P-TEFb

A. Is recruited to polymerase by transcriptional activators

B. Phosphorylates the serine 2&5 of the CTD repeats for elongation

C. Phosphorylates SPT5 and TAT-SF1
TLS Online TPP Program

#Question id: 4270

#Unit 3. Fundamental Processes

RNA helicase contains characteristic