In Hershey and Chase experiment, what finding led to the conclusion that DNA is the genetic material ?

(1) The presence of radioactivity in the bacteria when 35S was used.

(2) The presence of radioactivity in the supernatant when 35S was used.

(3) The presence of radioactivity in the bacteria when 32P was used.

(4) The presence of radioactivity in the supernatant when 32P was used.

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

VNTR are useful in DNA profiling because they:

I. Are hypervariable

II. Are inherited

III. Synthesize constitutive enzymes

(1) I, II, III are correct

(2) I and II are correct

(3) I and III are correct

(4) II and III are correct   

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

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

Reverse transcriptase is a:

(1) DNA dependent RNA polymerase

(2) RNA dependent DNA polymerase

(3) RNA dependent RNA polymerase

(4) DNA dependent DNA polymerase