#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
#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
#Question id: 4270
#Unit 3. Fundamental Processes
RNA helicase contains characteristic
#Question id: 4271
#Unit 3. Fundamental Processes
To participate successfully in the peptidyl transferase reaction, the tRNA must rotate into the peptidyl transferase center of the large subunit in a process called as
#Question id: 4272
#Unit 3. Fundamental Processes
There are two classes of release factors for translation termination. Choose correct statements
A. Class I release factors recognize the stop codons and trigger hydrolysis of the peptide chain from the tRNA in the P-site.
B. Prokaryotes have two class I release factors called RF1 and RF2. RF1 recognizes the stop codon UGA, UAA and RF2 recognizes the stop codon UAG and UAA.
C. In eukaryotic cells, there is a single class I release factor called eRF1 that recognizes all three stop codons.
D. Class II release factors stimulate the dissociation of the ribosome after release of the polypeptide chain.
#Question id: 4273
#Unit 3. Fundamental Processes
80S initiation complex includes