bio paper 6 Flashcards
why is it better to correct several results
identify anomalous results
test and result for starch
starch use iodine solution, turns blue black if positive negative if orange/brown
test and result for protein
biuret
blue= neg
purple/ lilac= positive
test and result for fats
ethanol emulsification test needs to add water as well
produces milky white precipitate if positive
neg= continues colourless
test and result for reducing sugar
benedicts solution, must use warm water bath
rainbow closer to red= pos
closer to blue= neg
test and result for vitamin c
dcpip
blue= negative
colourless= positive
how do you test a leave for starch
drop into very hot/ boiling water for one minute (to destroy cell membrane so chlorophyll molecules can pass through)
drop into hot ethanol to remove dissolve the green chlorophyll
place leaf into water to rehydrate and soften the leaf so that it can spread out
drop iodine solution onto the leaf to test for starch