Ch 4 - Ch 4 Cells the working units of life 4.1 What...

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Ch 4. Cells the working units of life 4.1 What features of cells make the fundamental unit of life? - Cells are building blocks of life * Cell Theory implies 1. Studing cell biology is in some secse the same as studying life. (the function of cell of  a bacteria is similar to the cell of Eukaryotes.) 2. Life is continuous (All cells in the body came from the single cell.) 3. The origin of life on earth was marked by the origin of the first cells. Cell size is limited by the surface area to volume ratio. - The volume of  a cell determines the amount of chemical activity it carres out per unit  of time. - The surface area of a cell determines the amount of substances the cell can take in  from the outside environment and the amount of waste products it can release to the  environment. Plasma membrane - Composed of phospholipid bilayer (hydrophilic heads and hydrophobic tails.) - Allows the cell to maintain a more or less constant internal envionment. - Selectively permeable barrier - Communicating with adjacent cells and receiving signals from the environment - Often has proteins protruding from it that responsible for binding and adhering to  adjacent cells. Prokaryotic  or Eukaryotic - Prokaryote – Archaea and bacteria - Eukaryotes – protists, plants, fungi, and animals
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4.2  What are the characteristics of prokaryotic cells?  1. Certain feature sharing * plasma membrane * nucleoid (contained hereditary material –DNA- of the cell, cytoplasm (rest of the  material in  the cell) * Cytosol : mostly water (contains ions, small molecules, and soluble macromolecules) * Ribosomes –sites of protein synthesis.
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