Q. No.The discontinuously synthesized DNA fragments are later joined by:
(1) DNA helicase
(2) Topoisomerase
(3) DNA ligase
(4) DNA polymerase
(1) DNA helicase
(2) Topoisomerase
(3) DNA ligase
(4) DNA polymerase
In actual structure, tRNA is a compact molecule which looks like a/an:
(1) Clover leaf
(2) Rail road
(3) Inverted L
(4) Alpha helix
Which of the following anticodons will hybridize with the mRNA codon 5’ – AUG – 3’?
1. 5’ – UAC – 3’
2. 5’ – TAC – 3’
3. 3’ – UAC – 5’
4. 3’ – TAC – 5’
Which of the following acts as a ribozyme for peptide bond formation in bacteria?
(1) 5s rRNA
(2) 23s rRNA
(3) 16s rRNA
(4) 5.1s rRNA
The UTR [untranslated regions] in an mRNA:
(1) Are present only at 5’ end and are not required for efficient translation
(2) Are present only at 3’ end and are not required for efficient translation
(3) Are present at both 5’ and 3’ ends and are not required for efficient translation
(4) Are present at both 5’ and 3’ ends and are required for efficient translation process
Gene regulation in prokaryotes is carried out exclusively at the level of:
(1) Initiation of transcription
(2) Post transcriptional modifications
(3) Translation
(4) Post translational modifications
Which of the following acts as the substrate and provide energy for DNA replication?
(1) Dideoxyribonucleoside triphosphates
(2) Ribonucleoside triphosphates
(3) Deoxyribonucleoside triphosphates
(4) Deoxyribonucleotide triphosphates
Any mistakes during DNA replication by the enzyme would result into:
(1) Cancer
(2) Apoptosis
(3) Cell fragmentation
(4) Mutation
What radioactive isotope was use by Meselson and Stahl to label DNA in their experiment?
1. 35 S
2. 15 N
3. 32 P
4. None
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