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What is an inorganic ion? (1)
An ion that doesn't contain carbon
NOTE: Definition is not required for the specification but useful to understand, just in case
Describe the role of sodium (1)
Co-transport of glucose and amino acids across the cell membrane
Describe the role of Iron (1)
Component of haemoglobin, which transports oxygen
Describe the role of hydrogen (1)
Important in determining pH and thus, affecting protein structure and enzyme activity
Describe the role of phosphate (1)
Important as a structural component of DNA, RNA and ATP