Chapter 11 - Transcription and Translation

Neither the idea of an rna world suggests that rna

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: liest molecule to both store information and catalyze reactions RNA splicing via splicesosomes could have evolved from self-splicing RNAs Synthesis and Processing of rRNAs 6 o o o o o o o o o o rRNA ribosomal RNA encoded in DNA as rDNA typically clustered in the genome in nondividing cells, rDNA are clustered in the nucleoli, where ribosomes are produced a eukaryotic cell may contain millions of ribosomes composed of proteins and rRNA note: svedbers unit (s) is the rate of sedimentation in centrifuge this is the unit ribosomes are measured in rRNA genes are arranged in tandem the rRNA transcription has a Christmas Tree pattern the promoter lies just upstream from the transcript initiation proteins that convert rRNA precursors into mature rRNA become associated with pre-rRNA during transcription the non transcribed spacer separates transcription units in a ribosomal gene cluster Processing of the rRNA Precursor o o o o o o o o o o o in humans, the large ribosomal subunit contains a 28S, 5.8 S and 5S rRNA the small ribosomal subunit contains 18S rRNA a single...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online