ARTH 1102 Lecture Notes - Lecture 13: Cell Membrane, Cell Theory, Chromatin
21 Sep 2016
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Document Summary
Cells basic unit for all forms of life. Cells are the basic units of structure and function in living things. Cell membrane: thin, flexible barrier around the cell. Cell: strong layer around the cell membrane (plant cells) Nucleus: large structure that contains the cells genetic material and controls the cells activities. Cytoplasm: material inside cell membrane excluding the nucleus. Cells are divided into 2 sections: prokaryotes (no nucleus) and eukaryotes (nucleus) Eukaryotes contain organelles: specialized structures that perform important cellular functions. No animals have cells with cell walls, but everything else does. Cell walls provide protection and support for the cell. The nucleus controls most cell processes and contains the hereditary information of. Chromosomes: distinct, threadlike structures containing the genetic information that is passed from one generation of cells to the next. Nucleolus: small dense region in the nuclei where ribosomes begin to form. Cytoskeleton: network of protein filaments that helps the cell to maintain its shape.
