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.

TLS Online TPP Program

#Question id: 5016

#Unit 9. Evolution & Diversity of Life Forms

Approximately how far back in time does the fossil record extend?

TLS Online TPP Program

#Question id: 5017

#Unit 9. Evolution & Diversity of Life Forms

Arrange these events from earliest to most recent.

1.  emission of lava in what is now Siberia at time of Permian extinctions

2.  emission of lava that solidified at the same time as iron-bearing terrestrial rocks began to rust

3.  emission of lava that solidified at the same time as rusted iron precipitated from seawater

4.  emission of lava in what is now India at time of Cretaceous extinctions

TLS Online TPP Program

#Question id: 5018

#Unit 9. Evolution & Diversity of Life Forms

Which event is nearest in time to the end of the period known as snowball Earth?

TLS Online TPP Program

#Question id: 5019

#Unit 9. Evolution & Diversity of Life Forms

A major evolutionary episode that corresponds in time most closely with the formation of Pangaea was the

TLS Online TPP Program

#Question id: 5020

#Unit 9. Evolution & Diversity of Life Forms

Dicynodonts survived the Permian extinction and, therefore, existed during both the

TLS Online TPP Program

#Question id: 5021

#Unit 9. Evolution & Diversity of Life Forms

Most dinosaurs and pterosaurs become extinct at the close of the __________ era.