BIOA01H3 Lecture Notes - Lecture 3: Intron, Conformational Change, Phosphodiester Bond

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BIOA01H3 Full Course Notes
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BIOA01H3 Full Course Notes
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Main activity of g1 occurs in nucleus. Is surrounded by 2 membranes that fit close together (2 phospholipid bilayers) Pair of membranes is called nuclear envelope: the inner membrane, at its inward facing side has a protein meshwork called the nuclear lamina, lamina is made up of intermediate filaments that gives strength to the nuclear envelope. Each nuclear pore consists of eight large proteins arranged in an octagon: nuclear pores are a carefully regulated set of openings that control the movement of large molecules in and out of the nucleus. During most of the cell cycle, dna is packaged with proteins into chromosomes that exist as fibers organized into loop domains. The term chromatin refers to the association of. Chromosomal proteins protect dna from damage and organize it so it will fit in the nucleus. Level 1 packaging: dna helix is wrapped twice around a core particle made of 8 core histone proteins.

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