BIOL10005 Lecture Notes - Lecture 17: Nuclear Membrane, Archaea, Protist
1 Oct 2018
School
Department
Course
Professor
Document Summary
Genetics and evolution - lecture 17 - week 9. Kingdoms: bacteria, archea, protista, plantae, fungi, animalia. Eukaryotic division: multiple origins of replication, linear dna continuously loses its ends because of dna synthesis, and must start with a little piece of rna, gets shorter each time it is replicated. Nuclear envelope: essentially rough er pressed up against the dna: gaps in the pressed pieces of. Er form pores: ribosomes can insert proteins into the er, during nuclear division, the envelope disintegrates, chromosomes divide and separate, er clusters around the chromosomes and forms a new envelope. Monday, 17 september 2018: nuclear envelope in eukaryotes partitions transcription and translation and ensures intron excision prior to translation, nuclear envelope probably evolved in response to introns which were only permitted by dna expansion with linear chromosomes. Eukaryotes increasing genome size: histone proteins, linear chromosomes, multiple chromosomes, multiple replications of origins, telomeres, nuclear enveloppe.
