Biology cell Notes

Biology cell Notes - A. What is a cell? 1. A Cell is the...

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A. What is a cell? 1. A Cell is the smallest structural & functional unit that is capable of carrying out processes that maintain LIFE .
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a. their DNA is loose in region of cell center, called the nucleoid b. Ribosomes are their only organelles
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1. Have cell M/B (cell wall only in plants, fungi) 2. Have M/B enclosed cell organs called organelles 3. Have nucleus which houses DNA
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membrane , called the plasma mosaic model a. protection (keeps organelles inside & separates cell from its environment) b. to control what moves in and out c. generates and maintains M/B potential, charge differences across membrane = negative inside and This enables nerve
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2. Composition of cell membrane a. Composed of a thin bilayer of phospholipids w/ embedded proteins, floating on top of cytosol. M/B cells are stuck together w/ cholesterol. b. Cell M/B is filled with gel-like cytoplasm or cytosol, in which organelles are suspended
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c . Proteins embedded in cell M/B can function as (1) Receptors which serve as binding sites for hormones, (2) CAMs (cell adhesion molecules) provide anchorage (3) channels or pores (4) carriers (facilitate movement of molecules across M/B) (5) glycoproteins for cell ID
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e.
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This note was uploaded on 04/18/2008 for the course BIO 110 taught by Professor Ms.mimidavis during the Fall '07 term at Wake Tech.

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Biology cell Notes - A. What is a cell? 1. A Cell is the...

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