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1.Which of the following DNA repair systems involving DNA N-glycosylasesrecognizes an abnormal DNA nucleotide (i.e. uracil)...

1.Which of the following DNA repair systems involving DNA N-glycosylasesrecognizes an abnormal DNA nucleotide (i.e. uracil) and cleaves the bond between it and the sugar?

- Mismatch repair

-Base excision repair

-Non-homologous end-joining repair

-Homologous recombination repair

2. self-splicing is the most common mechanism for splicing mRNA transcribed from eukaryotic, nuclear, structural genes

- true or false

3. True or False, during elongation of transcription, RNA polymerase is primarily in a closed complex

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Answer #1

Answer-1 Option(b) Base excision repair

Answer-2 False. self splicing occurs in group 1 and group 2 introns . Mostly splicing in AUAG introns of mRNA are performed by spliceosome in an ATP dependent manner

ANswer-3 FAlse. during elongation of transcription, RNA polymerase is in open ternary complex consisting DNA, RNA and RNA polymerase itself

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