During the second transesterification reaction in the RNA splicing mechanism the

Question

During the second transesterification reaction in the RNA splicing mechanism the _____ is bound to the _______. 3'-OH of the upstream exon: 2'-OH of the branch site A 5'-PO4 of the intron: 2'-OH of the branch site A 5'-PO4 of the upstream exon: 3'-OH of the downstream exon 5'-PO4 of the intron: 3'-OH of the branch site A 3'-OH of the upstream exon: 5'-PO4 of the downstream exon Enzymes associated with condensing chromatin structure in eukaryotic cells include _____ and ________. histone deacetylase: historie methyltransferase histone acetyl transferase: histone methyltransf erase histone deacetylase: O6-methylguanine-DNA methyltransferase histone deacetylase: DNA glycosylase

Explanation / Answer

Ans 12. 3'-OH of the upstream exon joins 5'-PO4 of the downstream exon

Ans 13. Histone deacetylase and histone methyltransferase.

Removal of acetyl group and addition of methyl group leads to compact packaging of chromatins.

DNA glycolase and O6- methylguanine-DNA methyltransferases are involved in DNA repair not in condensation.

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