Save
...
Biological molecules
Biological molecules
Carbohydrates
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
Eva
Visit profile
Cards (19)
3 disaccharides
sucrose
Maltose
Lactose
3 monomers
monosaccharides
Amino acids
Nucleotides
3 monosaccharides
glucose
Galactose
Fructose
3 polysaccharides
starch
Cellulose
Glycogen
describe Benedict’s test for non reducing sugars
negative result= Benedict’s reagent remained
blue
Hydrolyse non
reducing
sugars (eg
sucrose)
into their monomers by adding
hydrogen
chloride
Heat in a boiling
water
bath
for a few minutes
Neutralise the mixture using
sodium
carbonate
solution
Proceed with usual Benedict’s test
describe benedicts test for reducing sugars
add equal volume of benedicts reagent to a sample
Heat the mixture in a boiling
water
bath
for a few minutes
Positive result= colour change from
blue
to
orange
/ brick
red
(darker the red the
higher
the concentration of
sugar)
definition of disaccharide
Pair of
monomers
combined
together
Formula for glucose
C(
6
)H(
12
)0(
6
)
Glucose + glucose
Maltose
Glucose + fructose
Sucrose
glucose + galactose
Lactose
How are disaccharides formed
Via a
condensation reaction
Monosaccharide
Single
monomer
Polymer
Made from a
large
number of
monomers
bonded together
Bond disaccharides are joined by
Glycosidic bond
Isomer
Same
molecular
formula
different
structure
Four types of biological molecules
carbohydrates
Lipids
Proteins
Nucleic acids
Elements found in carbohydrates
carbon
Hydrogen
Oxygen
Properties and uses of glucose
soluble
: transported around organisms
Bonds store lots of
energy
: energy release when bonds are broken