carbohydrates, lipids, proteins

Question 1

carbohydrates (elements)

Answer 1

carbon, hydrogen and oxygen

Question 2

fats (elements)

Answer 2

carbon, hydrogen and oxygen

Question 3

proteins (elements)

Answer 3

carbon, hydrogen, oxygen, nitrogen and sulfur

Question 4

glycogen and starch (synthesized from?)

Answer 4

glucose

Question 5

polypeptides (synthesized from?)

Answer 5

amino acids

Question 6

lipids (synthesized from?)

Answer 6

fatty acids and glycerol

Question 7

starch (structure)

Answer 7

mixture of 2 polysaccharides, consisting of glucose molecules

Question 8

starch (role)

Answer 8

major storage carbohydrate of most plants as an important energy source

Question 9

triglyceride (structure)

Answer 9

formed by condensation reaction between fatty acids and glycerol

Question 10

triglyceride (role)

Answer 10

• energy source
• complete oxidation produces large amount of metabolic water
• storage of fats as adipose tissues gives buoyancy to the body
• oils acts as waterproofing for hairs and feathers
• electrical insulation around nerve cells

Question 11

phospholipid (structure)

Answer 11

1 fatty acid is replaced by an ionised phosphate group, consists of hydrophilic head + hydrophobic tail

Question 12

phospholipid (role)

Answer 12

in cell surface membrane, they only allow small, non-polar molecules to pass through