3.1.8 Inorganic ions Flashcards

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1
Q

what is an inorganic ion?

A

an ion that does not contain carbon (there are a few exceptions)

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2
Q

where do inorganic ions occur?

A

in the cytoplasm and bodily fluids of organisms

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3
Q

each ion has a specific role, depending on…

A

its properties

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4
Q

an ion’s role determines…

A

whether it is found in high or low concentrations

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5
Q

which four inorganic ions does the specification require knowledge of?

A
  • hydrogen ions
  • iron ions
  • sodium ions
  • phosphate ions
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6
Q

what role do hydrogen ions play?

A
  • determine pH levels and acidity
  • the higher the concentration of hydrogen ions the lower the pH
  • enzyme-controlled reactions are all affected by pH
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7
Q

what role do iron ions play?

A
  • are an important component of haemoglobin and are key to how oxygen is transported around the body by red blood cells
  • each of the four peptide chains in haemoglobin contains an iron ion in the centre
  • Fe2+ temporarily becomes Fe3+ when bound to oxygen, until the oxygen is released
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8
Q

what role do sodium ions play?

A

involved in the co-transport of glucose and amino acids across membranes

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9
Q

what role do phosphate ions play?

A
  • component of DNA, forms phosphodiester bonds with deoxyribose
  • component of ATP, makes ADP more reactive through phosphorylation
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