Cellular notes.xlsx - P cytology plasma membrane cytoplasm cytosol intracellular fluid organelles nucleus chromosomes genes plasma membrane plasma

Cellular notes.xlsx - P cytology plasma membrane cytoplasm...

This preview shows page 1 - 3 out of 26 pages.

P P cytology study of cell structure and function plasma membrane cytoplasm cytosol – intracellular fluid fluid portion of cytoplasm organelles nucleus houses cells DNA chromosomes single molecule of DNA genes hereditary units plasma membrane flexible, sturdy barrier surrounding cell how fancy people describe the plasma membrane lipid bilayer phospholipid cholesterol glycolipid amphipathic have both polar and non–polar parts hydrophillic water loving hydrophobic water hating membrane proteins glycoprotein cells outer surface separates _x000D_ internal environment from the external environment all cell contents between membrane and nucleus_x000D_ contains cytosol and organelles little organ_x000D_ all different shape with diff function plasma membrane:_x000D_ fluid moasic model found in cell membranes :_x000D_ arrangement of phospholipid, glycolipid and cholesterol molecules in 2 paralelle sheets._x000D_ hydrophilic heads ( polar) face outwards_x000D_ hydrophobic tails (non polar) face inward lipids that contain phosphorus;_x000D_ 75% of membrane lipids a lipid, most abundant steroid in animal tissue. in cell membranes_x000D_ 20% of membrane lipids lipids with carbohydrate groups attached. (5% of membrane lipids) integral protein – firmly embedded in membrane_x000D_ transmembrane protein – most integral proteins are these – span whole lipid bilayer peripheral protein – not as firmly embedded in membrane_x000D_ glycoprotein – protrude into extracellular fluid proteins with carb groups attached to ends_x000D_ glycocalyx – sugary coat
Image of page 1
functions of membrane proteins membrane permiability permits the passage of substances through it selective permiability concentration gradient electrical gradient difference in electrical charges between two regions membrane potential electrochemical gradient passive processes active processes ular energy used is: ATP – adenosine triphosphate ie: active transport" vesicles small sac containing fluid ion channel – holes that specific ions, like potassium (K+) can flow through_x000D_ carriers – selectily move an ion from one side of membrane to the other_x000D_ receptors – cellular recognition site. Recognizes and binds to specific molecule_x000D_ ligand – specific molecule that binds to a receptor_x000D_ enzymes – a substance that accelerates chemical reactions_x000D_ linkers – anchor proteins into membrane of neighbour cells_x000D_ cell–identity markers – enable cell to recognize other cells, respond to dangerous cells permits passage of select substances through, but restricts passage of others difference in the concentration of a chemical from one place to another. ie: either side of cell membrane._x000D_ usually, a substance will move down it's concentration gradient > from where more concentrated, to where it's less concentrated._x000D_ A positive charge will tend to move toward a negative and vice versa an electrical gradient that occurs across the plasma membrane._x000D_ _x000D_ _x000D_ usually the inner surface of plasma membrane is more negatively charged, and the outer surface is more positively charged
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 26 pages?

  • Spring '17
  • NA
  • _x000D_

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture