B6

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Author:
spacenut
ID:
239322
Filename:
B6
Updated:
2013-10-07 15:59:43
Tags:
biology
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Description:
OCR GCSE gateway
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  1. What features of a bacteria cell let them survive?
    • A flagellum for movement
    • A cell wall to maintain shape and to stop it from bursting
    • DNA to control the cell's activities and replication of the cell
  2. What different shapes can bacteria cells be?
    • Spherical
    • Rod shaped 
    • Spiral
    • Curved Rods
  3. How do bacteria reproduce?
    • They split in two
    • Type of asexual reproduction called binary fission
  4. How is it possible to get bacteria to reproduce artificially? What bit of equipment do you need?
    An agar plate
  5. What is the 'aseptic technique'?
    Sterilising all equipment to prevent contamination by other microbes
  6. How can the growth rate of Yeast be altered?
    • Changing food availability
    • Changing temperature
    • Changing pH
    • Removing waste products
  7. How is the growth rate of the yeast affected by a 10oC temperature rise?
    The growth rate of yeast doubles for every 10oC rise in temperature until the optimum is reached
  8. What are viruses?
    • Viruses are not living cells
    • Very small structures
    • Made of a protein coat surrounding a strand of genetic material
  9. What will happen when a virus reproduces?
    • Attach itself to a specific host cell
    • Inject its genetic material into the cell
    • Use the cell to make the components of new viruses
    • Use the cell to make the components of new viruses 
    • Cause the host cell to split open and die to release the viruses
  10. What conditions do viruses only reproduce under?
    • They can only reproduce in other living cells
    • They only attack specific cells, which may be plant, bacterial or animal cells
  11. Name three enzymes in washing powder
    • Amylase 
    • Lipase
    • Protease
  12. What is the function of the enzyme amylase?
    To digest carbohydrates such as starch
  13. What type of respiration is involved in the fermentation in yeast?
    Anaerobic Respiration
  14. What is the word equation for the fermentation in yeast?
    glucose (sugar) ---> ethanol (alcohol) + carbon dioxide
  15. What is the balanced chemical equation for fermentation?
    C6H12O---> 2C2H5OH + 2CO2
  16. What stages are included in the production of a DNA 'fingerprint'?
    • Extracting DNA from a sample such as blood
    • Cutting up or fragmenting the DNA using restriction enzymes
    • Separating the fragments using electrophoresis
    • Making the fragments visible using a radioactive probe
  17. Biomass can be burnt and used as fuel. Examples include:
    • Fast growing trees
    • Products of fermentation such as alcohol or biogas
  18. What does 'biogas' contain?
    • Biogas contains more than 50% methane
    • Some carbon dioxide
    • Traces of other gases

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