ions Flashcards
define ion
an atom with a charge
what are the name of ions with a positive charge
cation
what are the name of ions with a negative charge
anion
what is the role of haemoglobin
carry oxygen in red blood cells from lungs to respiring cells
what does haemoglobin consist of
4 polypeptides
Fe2+
what is the role of Fe2+ in haemoglobin
binds with oxygen to become Fe3+ before offloading oxygen in cells
give 2 examples of the importance of Na+ ions
- co transport of glucose and amino acids in the small intestine
- generating action potentials in neurones
what is it called when a PO43- is attached to another molecule
phosphate group
give 4 examples of molecules that contain the PO43- ion
ATP
3rd phosphate is hydrolysed to release energy
DNA
RNA
phosphate group binds to a pentose sugar to form a sugar phosphate backbone
phospholipid
phosphate is bounded to the glycerol
how do you calculate pH
concentration of H+ in a solution
if more H+ ions are present does this make the sample more acidic or more alkaline
more H+ = lower pH
more acidic
name 2 reactions that H+ ions play an important role in
aerobic respiration (ATP)
photosynthesis
