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Biology exam
Biology exam chapter 6
Term | Definition |
---|---|
Cytology | study of the cell -is the basic unit of life -based on their structure the cell will have a certain function -grow in the ideal environment are either prokaryotic, or eukaryotic -are small in size to max. cell membrane inorder to ensure met needs |
Anatomy of the Prokaryotic cell | -have a cell membrane -Store DNA & RNA in the ribisomes -NO MEMBRANE BOUND ORGANELLES - instead has nucleoid region -A capsule of polysacharides is used to surround the cell wall -cell membrane is made of glycoproteins -pili sometimes to stick |
Eukaryotic Cell Anatomy | - Have a cell (plasma) membrane ( Plants also have cell wall of cellulose) - consist of membranous bound organelles a) cytoplasm b) organelles c)cell (plasma) membrane |
Cytoplasm | consists of a solution called cytosol or intracellular fluid and organelles both membraneous or non membraneous |
Non- membraneous Organelles | Cytoskeleton :cell shape and transport Microvilli: short ext. & aid in absorption Cilia: long ext. move substances Flagella: longer ext. for cell movement Centrioles: Seperation of chromosomes Ribisomes: Required for protein synthesis (made of RNA) |
Organelles ( endomembrane) | 1)Endoplasmic Reticulum (smooth & rough ER) 2) Golgi Apparatus 3) Lysomes 4) Peroxisomes 5) Nucleus 6)Mitochondria |
Endoplasmic reticulum | are the flat membrane bound sacs in the cytoplasm -smooth ER (w/out ribisomes) does synthesis of fatty acids & phospholipis -Rough ER ( w/ ribisomes) does synthesis of proteins & PREPARES TRANSPORT TO GOLGI |
Golgi apparatus | processes and sorts membrane proteins from rough ER and forms lysomes |
Lysomes | are vesicles that contain enzymes called (acid hydrolasas w/pH of 5) that are used to degrade old organells |
Peroxisomes | contain degradative enzymes that degrade toxic compounds and fatty acids to produce H2O as a bi product |
Nucleus | is surrounded by a nuclear envelope that contains DNA coils called chromatin that when isnt being divided is called chromosomes reponsible for storage and processing of info into ribisomes |
Mitochondria | principle site of ATP synthesis " power plant of cell" w/ a double membrane of enzymes involved in energy production |
Cell membrane | outer boundary of a cell composed of lipids who have hydrophobic tail group & hydrophilic head group -Functions act physical barrier, regulate in and out, moniter & detect, & structural support |
3 types of membrane proteins | 1) trans membrane protein- (intergral) responsible for receptors in the ion channel 2) lipid anchored proteins 3) peripheral membrane proteins |
Cell Junctions | act like glue - several types of junctions 1) Plasmodesmata-flow into neighbor cell 2)tight junctions-prevent leak 3)Desmosomes-strong sheet protien (beta) 4) Gap junctions-communicating channels |
Cell adhesion molecules | Intagrins (CAMS) transmembrane proteins that attach to the cell membrane |
Extra cellular matrix | -In animal cells b/c they lack a cell wall -made of glycoproteins such as collegen ,proteoglycans, & fibronectin - Bind to intigrins (CAMs) -support -adhesion -movement -regulation |
Extracellular | enviorment surrounding cells |
Intracellular | enviorment within a cell |
Intercellular | between 2 or more cells |
cytosol | the intracellular fluid that contains ions and proteins excluding organells |
Microscopes | allow us to see specimens using magnification an enlarged size and resolution an ability to distinguish between two cells |
Light Micrscopes | beam of light through the lense to see unstrained and strained cells i) brightfield compound microscope II) phase contrast III) flurescense |
Electron microscope (EM) | uses a beam of electrons for a detailed image 2 types I) scanning cell surface (SEM II ) Transmission cell structure (TEM) |