Inorganic molecules 0.0 / 5 ? BiologyBiological moleculesASCCEA Created by: Kate1112Created on: 07-09-19 12:09 What does potassium do as an ion? Transmission of nerve impulses across neurons and maintain osmotic anion/cation balance across cell membranes 1 of 18 What does calcium do as an ion? Constituent of bones, teeth(enamel) + shell, clotting of blood and muscle contraction 2 of 18 What does calcium do in a compound? Calcium Pectate binds adjacent cell walls in plants to for the middle lamella 3 of 18 What does magnesium do as an ion? Activates many of the body's enzymes and is a component of bone and teeth 4 of 18 What does magnesium do in a compound? A constituent of chlorophyll (absorption of light and energy) 5 of 18 What does iron do as an ion? Found in electron carriers- cytochromes used in respiration and photosynthesis 6 of 18 What does iron do in a compound? Constituent of haemoglobin, it forms the Haem group(transports oxygen in blood) 7 of 18 What does hydrogen carbonate do as an ion? Behaves as a buffer in the blood 8 of 18 What does hydrogen carbonate do in a compound? Involved in the transport of CO2 in blood 9 of 18 What does nitrate do in a compound? Constituent of: amino acids + proteins(e.g.enzymes), nucleic acids(part of nitrogenous base adenine) and chlorophyll 10 of 18 What does phosphate do as an ion? Phosphate salts e.g.Na+K phosphates act as buffers 11 of 18 What does phosphate do in a compound? Constituent of: cell membranes as phospholipids, ATP and in nucleotides of DNA+RNA 12 of 18 What is a buffer? It is a compound which resists changes in pH and ensures that a particular environment maintains a particular pH 13 of 18 What do buffers do? They 'mop up' either H+/OH- ions when they become excessive 14 of 18 Name 2 examples of buffers Hydrogen carbonate and phosphate salts 15 of 18 How does hydrogen carbonate act as a buffer? In acidic conditions it accepts H+ ions to become carbonic acid and in alkaline conditions carbonic acid releases H+ ions to become hydrogen carbonate 16 of 18 Why are amino acids/proteins called amphoteric? They have both acidic and alkaline properties 17 of 18 How does amino acids act as a buffer? In acidic conditions H+ ions are taken up by the amine group and in alkaline conditions H+ ions are released from the carboxylic group 18 of 18
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