overview Cytoplasmic membrane Cell _________ Cell _______ Cytoplasm _________ Semipermeable barrier between inside and outside of cell Holds the cell shape Surrounds cell contents Consists of cytoplasmic membrand, cell wall, capsule (if present) Cell contents: cytoplasm and nucleoid Fluid insides Chromosome region
Cytoplasmic Membrane (slide 24 fig 3.24) ________ fluid bilayer embedded with proteins = fluid mosaic model Unique to prokaryotes – converts energy to usable form (eurkaryotes energy conversion in organelles) Have _______ transport chain Transfer electrons and eject protons along the way Expelled protons cause a proton gradient across the cell membrane (+ charge outside membrane) Electrochemical gradient results in energy called proton motive force (just like energy in battery)
Figure 3.2 proton motive force
Proton Motive force ____ created (like polar people in an argument creates energy unlike content people watching TV together) Ex. Angry couple -> one storms outside (tension between the two is high) – lots of energy – like when protons are pushed out of the cell _______ are allowed to move back into the cell Allows small molecules to go with it Energy used to synthesize __ (usable energy source) Ex. Angry couple release energy into a usable form. The outside person mows the lawn (ATP) to burn off tension and then comes back in the house relaxed just like when proton gets back into the cell.
Simple diffusion Water, hydrophobic molecules, gases (O2, C02) Speed of diffusion depends on concentration gradient ____ (slide 25) – cell wall keeps the cytoplasmic membrane from ballooning out Too much cell wall pressure results in ___