PL SC 221

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Author:
ebacker
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259717
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PL SC 221
Updated:
2014-02-01 22:02:41
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PL SC 221
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PL SC 221 Quiz 1 Cards
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  1. What is the middle lamella?
    • Area btwn cells
    • Non-living, filled w/ Ca & Mg pectates
    • Cement adjacent cells together
    • Breakdown of pectin = ripening
  2. What are plasmodesmata?
    • Pores
    • Allow continuum of cytoplasm/ mem from one cell to another
  3. Define symplast?
    Living material
  4. Define apoplast
    Non-living material
  5. What are the 3 main components of the plasmolemma?
    • Lipids (40%) -phospholipids, glycoplipids, sterols
    • Proteins (40%) - enzs in mem
    • Carbs (20%) - linked to proteins/lipids
  6. Why is the plasmolemma structure important?
    • Resistance to chilling injury
    • Aging/Senescence
  7. What phase change happens at critical temperature?
    Liquid crystalline state to solid gel phase
  8. What effect does chilling have on plants?
    • Changes the physical states of the membrane
    • Increases permeability
    • Halts mem activities
    • Enzs lose ability to catalyze rxns
  9. What determines critical temp?
    • Saturation of mem
    • Unsat can handle cooler temps
  10. What are some practical implications of chilling resistance?
    • Cross-breeding
    • Gene-splicing
    • Cultural practices (when & where to plant)
    • Hardening off
  11. What do the nucleoi do?
    Create ribosomal RNA which synth ribosomes
  12. What is the rol of the rough ER?
    • Studded with ribosomes
    • Protein synth
  13. What is the role of the smooth ER?
    • Process/sort proteins
    • Synth lipids
    • Regulate cytosolic [Ca]
  14. What is the role of dictyosomes (golgi app.)?
    • Assemble complex carbs for cell walls
    • Synth carb side chains for glycoproteins
    • Give rise to vescicles
  15. What are the roles of the vacuoles?
    • StorageĀ 
    • Digestion - breakdown/recycle almost all cell components
    • pH/ionic homeostasis - proton & ion reservoirs
    • Defense against paths & herbivores

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