Biology

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Author:
Anonymous
ID:
92761
Filename:
Biology
Updated:
2011-07-02 13:27:25
Tags:
Biology Cell Structure Function
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Description:
Cell Structure and Function Part 1
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  1. What are the 2 main type of cells?
    Eukaryotic and Prokaryotic
  2. What is the use of a Plasma Membrane?
    Acts as a selective barrier and helps to regulate its internal composition
  3. What are the characteristics of Eukaryotes?
    • Large
    • Contain membrane-bound organelles
    • Compartmentalise portions of cytoplasm for specific functions
    • Linear DNA
  4. What are the characteristics of Prokaryotes?
    • No nucleus nor membrane bound organelles.
    • Singular Circular DNA
  5. Conversion of units in microscopy
    • 1mm = 10 000 µm
    • 1µm = 10 000 nm

    1m = 100m = 1000mm = 106 µm = 109 nm
  6. Advantages of compartmentalization i.e cells having membrane bound organelles?
    Separates ions, enzymes and other molecules in the cytoplasm

    Separates chemical reactions, allowing each compartment to perform a different function

    Allows specialisation of cells

    Allow high concentrations of enzymes and molecules to accumulate in specific compartments (enhance efficiency of reactions)

    Each compartment has a surface for attachment of proteins for specific functions

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