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Prelims
Biochem Prelims
Imported Deck
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D sugars are
mirror images
of
L sugars
Carbohydrates
are
chiral
molecules with
carbon
atoms carrying
four
different groups
Glyceraldehyde
exists as a
pair
of
enantiomers
Epimers
differ at only
one chiral center
Diastereomers are stereoisomers that are not
exact mirror images
Hemiacetals
and
hemiketals
are formed from the reaction between
aldehydes
or
ketones
and
alcohols
Monosaccharides
can form
cyclic hemiacetals
Anomers are two possible
diastereomers
that may form during the
cyclization
reaction
Mutarotation
is the interconversion of
alpha
and
beta anomers
in solution
Haworth projections
are used to represent
cyclic sugars
Monosaccharides can undergo
oxidation
,
reduction
,
phosphate ester
formation,
amino sugar
formation, and
glycoside
formation
Reducing sugars
have the ability to reduce
silver
and
copper
ions.
Reducing sugars have
aldehyde
groups,
hydroxyketone
groups, or
cyclic hemiacetal
groups.
Reduction tests such as the
Benedict
,
Barfoed
, and
Fehling
tests are used to detect
reducing sugars.
The
Tollens
test is based on the formation of a
silver mirror.
The
Barfoed
test can distinguish between reducing
monosaccharides
and reducing
disaccharides.
Hydrolysis
is the process of
breaking
a
chemical bond
between
two molecules
using a
water molecule.
Phosphate
esters of
monosaccharides
play important roles in
carbohydrate metabolism.
Amino sugars
have one
hydroxyl
group replaced with an
amino
group.
Glycoside formation
involves the reaction of
hemiacetals
with
alcohols
to form
acetals.
Disaccharides
are formed by the
condensation
of two
monosaccharides
through
glycosidic bonds.
Common disaccharides include
maltose
,
sucrose
, and
lactose.
Lactose intolerance
is a condition where individuals lack the enzyme
lactase
needed to
hydrolyze
lactose.
Cellobiose is a
reducing disaccharide
found in
cellulose.
Invert sugar
is formed by the
hydrolysis
of
sucrose
and is commonly used in
food processing.
Artificial sweeteners
like
aspartame
and
sucralose
are
noncarbohydrate sweeteners.
Water
is the solvent for
biochemical
reactions
Heat capacity
is the amount of
energy
needed to
raise
the
temperature
of a
substance
Hydrolysis
is the
breaking
of a
chemical bond
between
two molecules
using a
water molecule
Oligosaccharides
are commonly found in
onions
,
cabbage
,
broccoli
, and
wheat
Antigens in the ABO blood group are
polysaccharides
Starch
is the chief
caloric
distributor in the diet and the reserve
carbohydrates
for plants
Amylose
is a long,
unbranched
chain polymer of
glucose units
joined by (α1→4)
glycosidic
bonds
Amylopectin
is a
branched chain polymer
of
glucose units
joined primarily by (α1→4)
glycosidic bonds
and occasionally by (α1→6)
glycosidic bonds
Glycogen
is the
glucose storage molecule
of
animals
, stored in
granules
in
liver
and
skeletal muscle cells
Cellulose is a
fibrous carbohydrate
found in plants and is the
structural component
of the plant's
cell wall
Chitin
is a polymer of
N-acetyl-D-glucosamine
and gives
rigidity
to the
exoskeletons
of
arthropods
Dextrans are
bacterial
and
yeast polysaccharides
made up of (α1→6)
-linked poly-D-glucose
Carageenan
is a
hydrocolloid
extracted from
red algae
and widely used in the
food industry
Peptidoglycan
is a network of
cross-linked carbohydrate chains
and
peptides
that constitutes the
cell walls
of
bacteria
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