Inorganic ions

• INORGANIC IONS:

  • ion has electrical charge
  • ion with positive charge: cation
  • ion with negative charge: anion
  • inorganic ion does not contain carbon
  • inorganic ions are in solution, in cytoplasm and body fluid
  • each ion has specific role, depend on properties
  • ion role determine whether found in high or low concs
• IRON IONS:

  • in haemoglobin
  • haemoglobin: carry O2 around body in red blood cells
  • made of four polypeptide chains, each has Fe2+ in center
  • Fe2+ binds to oxygen in haemoglobin
  • when O2 bound to Fe2+ ion temporarily becomes Fe3+ until O2 released
• Hydrogen ions:

  • determines pH
  • pH calculated based on conc of H+ in environment
  • more H+ = lower pH
  • enzyme controlled reaction affected by pH
• sodium ions

  • help transport C6H12O6 and Amino Acids across cell membrane
  • glucose/ amino acid can be transported into cell with Na+: co-transport
• Phosphate ions

  • when attached to another molecule is know as phosphate group
  • DNA, RNA, ATP has phosphate
  • bond between phosphate group store energy in ATP
  • phosphate group in DNA an RNA allow nucleotide to join and form polynucleotides