3.1.8 Inorganic ions

Question 1

Inorganic ion

Answer 1

• an ion (atom with electric charge)
• that does not contain carbon
• occurs in different concentrations in solution in the cytoplasm and body fluids of organisms

Question 2

Inorganic ion

List

Answer 2

Hydrogen ions (H+)
Iron ions (Fe2+)
Sodium ions (Na+)
Phosphate ions (PO43-)

Question 3

Hydrogen ions

Answer 3

-determine pH of solutions
└increase H+, decrease pH (more acidic)
-determines functioning of enzymes

Question 4

Iron ions

Answer 4

-transports oxygen in haemoglobin
└a protein made of 4 polypeptide chains each with in iron ion in the centre

-oxygen binds to Fe2+ in haemoglobin which temporarily becomes Fe3+ until oxygen is released

Question 5

Sodium ions

Answer 5

-cotransport of amino acids and glucose

Question 6

Phosphate ions

Answer 6

-aka phosphate group when attached to another molecule

• ATP: bonds between phosphate groups store energy
• DNA/RNA: structure, allows nucleotides to join → polynucleotides