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Chapter 4.doc - Biology 102: Principle of Biology Lecture...

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Biology 102: Principle of Biology LectureOutlinePrepared by: Samson Mengesha; PhDChapter 4: Cellular StructureI.The Importance of CellsA.Cell1.The cell is the lowest level of structure that is capable of performing all the activities of life.2.All organisms are made of cells, some organisms are single-celled and many organisms are multi-celled.B.Cell Theory1.Cells are an organism’s basic units of structure and function. 2.All organisms are made of cells. 3.All living cells arise from pre-existing cells.C.Cell types1.Prokaryotic Cells a.Found in Bacteriaand Archaea.b.No membrane-enclosed nucleus – DNA localized to “nucleoid region”.c.No membrane-bound organelles.2.Eukaryotic Cellsa.Found in animals, plants, fungus, and protists.b.Most of the DNA is in an organelle bounded by a double membrane, the nucleus.c.Have membrane enclosed organelles, and generally much larger than prokaryotic cells.D.Cell Structure1.All cells possess …a.Plasma membrane – a boundary that separate the inside of cell from the outside.b.Cytoplasm – the region between the nucleus and the plasma membrane. c.Ribosomes – that make proteins.d.Genetic material – chromosomes that carry genes in the form of DNA.E.Plasma membrane =the outer boundary of the cell (this will be detailed in Chapter 7). F.Cytoplasm= the region of a cell between the nucleus and cell membrane.1.Cytosol – the semi fluid substance in the cytoplasmic region that holds the cellular organelles.2.Organelles –are small, membranous structures with a specific structure and function.

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Term
Fall
Professor
Dr. Alexandra Jones
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