STRUCTURE & FUNCTION OF CELL COMPONENTS
Introduction <ul><li>Living systems are composed of a limited number of elements namely… </li></ul>CARBON, HYDROGEN, OXYGE...
Polymers <ul><li>Many biologically important molecules are  polymers  composed of monomers linked together </li></ul><ul><...
<ul><li>Making and breaking chemical bonds involves  ENERGY </li></ul><ul><li>Synthesising more complex structures  REQUIR...
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Structure Cell Components

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Structure Cell Components

  1. 1. STRUCTURE & FUNCTION OF CELL COMPONENTS
  2. 2. Introduction <ul><li>Living systems are composed of a limited number of elements namely… </li></ul>CARBON, HYDROGEN, OXYGEN, NITROGEN, PHOSPHORUS & SULPHUR <ul><li>The carbon atom is of central biological importance as it can form 4 covalent bonds with other atoms </li></ul><ul><li>This allows a variety of complex molecules to be constructed </li></ul><ul><li>Many functional chemical groups are also associated with biological molecules as they are important in biological systems </li></ul>
  3. 3. Polymers <ul><li>Many biologically important molecules are polymers composed of monomers linked together </li></ul><ul><li>Two monomers are joined together by removing water molecules. This is called a CONDENSATION reaction or DEHYDRATION synthesis </li></ul><ul><li>This can be reversed by adding (back) water -> HYDROLYSIS </li></ul><ul><li>This is an important feature of cell metabolism </li></ul>Dehydration Hydrolysis
  4. 4. <ul><li>Making and breaking chemical bonds involves ENERGY </li></ul><ul><li>Synthesising more complex structures REQUIRES energy. These are called ANABOLIC or BIOSYNTHETIC reactions </li></ul><ul><li>If there is little overall change in energy, the reactions are reversible </li></ul><ul><li>Cell metabolism is tightly controlled to avoid energy chaos </li></ul>

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