2.1 2.3

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2.1 2.3

  1. 1. Chapter 2- CellsAhsan, Jean, Felicia, Chris, Connor2.1-Cell Theory All organisms are composed of one or more cells Cells are the smallest unit of life All cells come from pre-existing cells Organisms are either unicellular or multicellular and all organisms carry out these functions of life- metabolism, growth, reproduction, response, homeostasis, nutrition The surface area to volume ratio, the surface area will always be more than the volume. The distance between the nucleus and the membrane should be small to get materials in and out of the cells faster. Surface area determines how much is available to the cell, and volume determines the needs of the cell. Cells divide in order to maintain a high surface area to volume ratio. Each cell contains all the genetic information for the entire organism, but each individual cell is specialized intended functions.2.2- Prokaryotic CellsFeatures of a Prokaryotic cell include: Cell wall A plasma membrane Ribosomes Flagella Free DNA, the nucleoid Pili Single cell organisms Organelles are not membrane bound Generally small- 1-10 micrometers2.3- Eukaryotic CellsCommon features of eukaryotic cells: Endoplasmic reticulum: contain ribosomes Ribosomes: protein synthesis Lysosomes(not in plant cells): contains digestive enzymes Golgi apparatus: modifies and packages proteins to be sent outside of the cell
  2. 2. Mitochondria: involved in ATP synthesis Nucleus: contains DNA, controls functions of the cell Chloroplast(only in plant cells and algal cells): involved in photosynthesis Vacuoles: storage for potential food, waste, toxins, and water Large: 5-100 micrometers DNA is often in the form of chromosomes found within the nucleusPlant cell:Animal cell:

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