A segment of DNA coding for a polypeptide is most accurately defined as:
(1) Operon
(2) Gene
(3) Recon
(4) Cistron
(1) Operon
(2) Gene
(3) Recon
(4) Cistron
In eukaryotes the sequences that appear in mature or processed mRNA are called:
(1) Introns
(2) Cistrons
(3) Exons
(4) Mutons
What facilitates the opening of the helix during elongation step of transcription?
(1) RNA polymerase
(2) Helicase
(3) Topoisomerase
(4) Gyrase
Which of the following helps in termination of transcription?
(1) Sigma factor
(2) Translocase
(3) Ubiquitin
(4) Rho factor
What is added to the 5’ end of hnRNA in Eukryotes?
1. Poly A tail
2. Methyl cytosine triphosphate
3. Methyl guanosine triphosphate
4. Poly U tail
Some amino acids are coded by more than one codon. Hence genetic code is:
(1) Unambiguous
(2) Non specific
(3) Degenerate
(4) Universal
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’
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