BY4 4

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BY4 4
2014-03-26 17:10:00

Wjec BY4
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  1. What type of bacteria cannot survive in the presence of oxygne?
    Obligate anaerobes
  2. 6 methods to prevent contamination in Aseptic technique.
    • Washing Hands
    • Disinfecting the bench 
    • Flaming inoculating loop
    • Lift Petri dish lid at an angle
    • Flame mouth of tube 
    • Use Bunsen burner to create updraft/
  3. Give 4 advantages of ATP as an energy source.
    • Soluble
    • Easily transported across membranes
    • Releases energy in usable amounts, 30.6 kJmol-1 
    • Only one enzyme needed to release energy.
  4. Define anaerobic respiration.
    • Only Glycolysis can take place.
    • 2 molecules of ATP from substrate level phosphorylation. 
    • Glucose to pyruvic acid.
    • Pyruvic acid to Lactate from reduced NAD
    • Regenerates NAD allowing glycolysis to continue.
  5. Why is ATP know as the "universal energy currency" ?
    It supplies energy to all organisms for all processes 
  6. What are the advantages of having many pigments?
    • Increases range of wavelengths from which energy can be obtained.
    • Meaning greater efficiency of photosynthesis.
  7. How is Resting Potential created?
    • Naions are actively pumped out faster than K+ in.
    • Membrane also has a higher permeability to Kthan Na+ - so K+ ions diffuse out of the axon.
    • Therefore outside of the axon is relatively positive compared to the inside.