NATS 1610 Study Guide - Midterm Guide: Membrane Transport Protein, Respiratory Tract, Cartilage
5 Dec 2018
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Document Summary
Cytoplasm portion of the cell interior that is not occupied by the nucleus. Consists of two parts: organelles- little organs . Complex, gel-like mass which other cell structures and dissolved molecules. 70%-90% water, usually transparent: most cellular activites occur in the cytoplasm. Including many metabolic pathways and various processes: the cytosol is a crowded solution of various molecules, cytoskeletal folaments, dissolved molecules, and water, fills much of the volume of a cell. Nucleus contains a cells genetic library (dna) and is usually the cells largest organelle: protects dna and keeps it from damaging and tangling within the cytoplasm. Nuclear membrane controls what goes in and out of the nucleus: selectively permeable, comppsed of two phospholipids bilayers with proteins (two membranes) Outer portion of membrane merges with endoplasmic reticulum membrane. Inner portion of membrane anchors dna molecules (chromatin) Nuclear pores: cross both nuclear membranes, create channels for free movement of small molecules and ions.
