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CCEA Biologically Important Ions

List the biological roles of the ions listed below. Please note, answers are according to the CCEA AS biology textbook, from the 2016 specification (page 6 of the textbook)
Quiz by BiologicalBro
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Last updated: February 11, 2021
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First submittedFebruary 11, 2021
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Ion
Biological Roles
Calcium (Ca²⁺)
Essential component of middle lamella (calcium pectate)
 
Essential component of bones and teeth in animals
 
Essential in blood clotting
Iron (Fe²⁺)
Part of haem group in haemoglobin
 
Important constituent of electron carriers in respiration
Magnesium (Mg²⁺)
Essential in giving chlorophyll its light-absorbing properties
Potassium (K⁺)
Important in maintaining electrical gradients across neurones
Nitrate (NO₃⁻)
Component of amino acids
 
Component of nucleic acids
 
Component of chlorophyll
Phosphate (PO₄³⁻)
As phospholipids in cell membranes
 
Component of nucleic acids
 
Component of adenosine triphosphate (ATP)
Hydrogencarbonate (HCO₃⁻)
Important as a natural buffer
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