BIOB11H3 Study Guide - Midterm Guide: Mature Messenger Rna, Ribosomal Rna, Precursor Mrna
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Biob11 lecture 5 heterogeneous nuclear rna (hnrna) synthesis and processing. Vocabulary hnrna (heterogeneous nuclear rnas): a large group of rna molecules that share the following properties: 1. They heave large molecular weights (up to about 80s, or 50,000 nucleotides); 2. they represent many different nucleotide sequences; and 3. Preinitiation complex: the assembled association of general transcription factors and rna polymerase, required before transcription of the gene can be initiated. Protein kinase: an enzyme that transfers phosphate groups to other proteins, often having the effect of regulating the activity of the other proteins. Phosphorylation: the addition of a phosphate group to a protein mrna cap: found at the 5" end of protein. Poly (a) tail: a string of adenosine residues at the 3" end of an mrna added post-transcriptionally. Untranslated region: noncoding segments contained at both 5" and 3" ends of mrnas.
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