Which of the following important biochemical reactions in living systems is catalyzed by a ribozyme?

1. Repair of DNA

2. Electron transport chain

3. Formation of peptide bond

4. Organization of MTOC during cell division

Match each item in COLUMN I with one in COLUMN II and select your answer from the codes given:

Which enzyme polymerizes RNA with defined sequences in a template independent manner?

(1) Peptidyl transferase

(2) RNA polymerase

(3) Reverse transcriptase

(4) Polynucleotide phosphorylase

The process of RNA splicing shows the dominance of :

(1) DNA world

(2) RNA world

(3) Protein world

(4) Microbial world

In RNA splicing :

(1) Exons are removed and introns are joined together

(2) Introns are removed and exons are joined together

(3) Cistrons are removed and introns are joined together

(4) Introns are removed and Cistrons are joined together

The core RNA polymerase is capable of catalyzing which steps of transcription ?

(1) Initiation only

(2) Elongation only

(3) Termination only

(4) All of these

In most prokaryotes the transcription unit is :

(1) Mono-cistronic

(2) Poly-cistronic

(3) Multi-cistronic

(4) Uni-cistronic

What defines the position and presence of coding and a template strand in the transcription unit ?

(1) Structural gene

(2) Ori

(3) Terminator

(4) Promoter

Which of the following is true for both transcription and DNA replication?

1. Principle of complementarity governs the processes

2. Only of the two strands act as template

3. Only a segment of both strands is involved 

4. Adenine base pairs with thymine

The DNA dependent DNA polymerases catalyze:

1. Only in 3'-5' direction

2. Only in 5'-3' direction

3. In both directions

4. In neither directions