Elements and ions

Question 1

Carbohydrate elements

Answer 1

C,H,O

Question 2

Lipid elements

Answer 2

C,H,O

Question 3

Protein elements

Answer 3

C,H,O,N,S

Question 4

Nucleic acid elements

Answer 4

C,H,O,N,P

Question 5

Calcium ions (Ca2+)
(Cation)

Answer 5

> Muscle contraction
Nerve impulse transmission

Question 6

Sodium ions (Na+)
(Cation)

Answer 6

> Co-transport
Reabsorption of water in the kidney
Nerve impulse transmission

Question 7

Potassium ions (K+)
(Cation)

Answer 7

> Stomatal opening
Nerve impulse transmission

Question 8

Hydrogen ions ( H+)
(Cation)

Answer 8

> Chemiosmosis
pH determination
Catalysis of reactions

Question 9

Ammonium ions (NH4+)
(Cation)

Answer 9

> Nitrogen cycle
(Bacteria convert ammonium ions to nitrate ions)

Question 10

Nitrate ions (NO3-)
(Anion)

Answer 10

> Mineral ion
Absorbed by plants
Source of nitrogen to make amino acids

Question 11

Hydrogencarbonate ions (HCO3-)
(Anion)

Answer 11

> Maintains pH of blood

Question 12

Chloride ions (Cl-)
(Anion)

Answer 12

> Provide negative charge to balance sodium and potassium ions in cells

Question 13

Phosphate (PO43-)
(Anion)

Answer 13

> Phospholipid formation (for plasma membranes)
Nucleic acid and ATP formation
Making bones

Question 14

Hydroxide ions (OH-)
(Anion)

Answer 14

> Catalysis of reactions
Determining pH