biological molecules (ions)

Question 1

what is an ion?

Answer 1

atom with an electric charge

Question 2

what is a cation?

Answer 2

ion with a positive charge

Question 3

what is an anion?

Answer 3

ion with a negative charge

Question 4

what is an inorganic ion?

Answer 4

ion that doesn’t contain carbon

Question 5

what is the role of an iron ion?

Answer 5

part of haemoglobin
haemoglobin carries oxygen around the body, made of 4 polypeptide chains with an iron ion in the centre
the iron ion binds to oxygen

Question 6

what is FE2+?

Answer 6

iron ion

Question 7

what is the role of hydrogen ions?

Answer 7

determine pH
pH based on the concentration of hydrogen ions
more H+ the lower the pH- more acidic

Question 8

what is H+?

Answer 8

hydrogen ions

Question 9

what is the role of sodium ions?

Answer 9

help transport glucose and amino acids across cell membranes
co transport

Question 10

what is Na+?

Answer 10

sodium ions

Question 11

what is the role of phosphate ions?

Answer 11

part of DNA, RNA, and ATP
phosphate groups store energy in ATP
phosphate groups in DNA/RNA allow nucleotides to join