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
Match each item in COLUMN I with one in COLUMN II and select your answer from the codes given:
COLUMN I | COLUMN II |
SCIENTIST | CONTRIBUTION |
Francis Crick | a. Breaking the genetic code |
Nirenberg | b. Eastablished Coenorthabditis elegans as as a model genetics study organism |
Benzer | c. Central dogma of molecular biology |
Brenner | d. Bacteriophase genetics |
A | B | C | D | |
1. | c | a | d | b |
2. | c | a | b | d |
3. | a | b | c | d |
4. | a | c | d | b |
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