Biology 1201A Chapter Notes - Chapter 2: Antonie Van Leeuwenhoek, Nuclear Pore, Nuclear Membrane
15 Jul 2015
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Cell theory: all organisms are composed of one or more cells, the cell is the basic structural and functional unit of all living organisms, cells arise only from the division of pre-existing cells. 2. 1 basic features of cell structure and function: almost all bacteria & archea= unicellular, independent/ capable of carrying out all activities, plants & animals= multicellular, capable of surviving by themselves. 10/09/13: vital activities- cytoplasm including synthesis & assembly of molecules, conversion of chemical and light energy, conducts stimulatory signals from outside to interior. 2. 1c cells occur in prokaryotic and eukaryotic forms, each with distinctive structures and organization: prokaryotic- dna contained in nucleoid, has no boundary separating it from cytoplasm, eukaryotic- dna contained in nucleus, membrane bound compartment. 2. 3 eukaryotic cells: protists, fungi, animals, plants. 2. 3a eukaryotic cells have a true nucleus and cytoplasmic organelles enclosed within a plasma membrane: plasma membrane- functions through embedded proteins, other proteins= receptors- recognize and bind specific signal molecules in cellular environment.
