bio molecules (fav) Flashcards
what is glucose chemical formula
c6h12o6
what are sugars with a single carbon ring known as
Monosaccharides
what are sugars with 2 carbon rings known as
Disaccharides
what are many glucose molecules joined together known as
polysaccharide
what is an example of a polysaccharide
glycogen
what are fats smaller unit
fatty acids and glycerol
what are proteins smaller unit
amino acids
what is another form of a protien
enzymes
what elements are proteins made from
carbon, hydrogen, oxygen, nitrogen
what is the test for starch
iodine test
what does a positive iodine test show
Dark blue colour (if starch present)
what is the test for reducing sugar (monosaccharides)
benedicts solution
what does a positive benedicts test show
The solution will change from clear blue to cloudy green, then yellow and finally to a red precipitate
(if monosaccharide is present)
what is the test for protiens
biuret test
what does a positive biuret test show
A purple colour indicates protein
what is the test for fats
ethanol test
what does a positive ethanol test show
A milky white emulsion will form.
if fat or oil was present
what is the process for a benedicts test
1 ml of sample is placed into a clean test tube. 2 ml (10 drops) of Benedict's reagent is placed in the test tube. The solution is then heated in a boiling water bath for 3-5 minutes. Observe for color change (clear blue to brick red) in the solution of test tubes or precipitate formation.
test for vitamin C
DCPIP test (Dichlorophenolindophenol)
what does a positive test for vitamin C show
blue to colourless
if contains vitamin C
what binds with what in DNA
Adenine–thymine (double bond)
cytosine—guanine (triple bond)
important specifications of food test
use pestle and mortar to grind what you want to test
this is done to increase surface area so that the colour change is visible
add 5-10ml of iodine to the thing you want to test and observe for colour change from orange-brown to blue-black
