CARB MAIN Flashcards
most abundant class of bioorganic molecules on planet Earth
CARBS
percentage of carbohydrates by mass of dry plants materials
75%
produce carbohydrates via
photosynthesis
GREEN PLANTS
carbs that serves as structural elements
CELLULOSE
two main uses of plants for the carbs that they produce
CELLULOSE
STARCH
carbs that provide energy reserves for plants
STARCH
major carbohydrate source for humans and animals
Dietary intake of plant materials
(Cn(H2O)n)
CARBS
chemical formula for carbohydrates
(Cn(H2O)n)
a polyhydroxy aldehyde, a polyhydroxy ketone, or a compound that yields polyhydroxy aldehydes or polyhydroxy ketones upon hydrolysis
CARBS
carbohydrate glucose
polyhydroxy aldehyde
carbohydrate fructose
polyhydroxy ketone
classification of Carbohydrates based on molecular size
MONOSAC
DISAC
OLIGOSAC
POLYSAC
important property of many molecules, including most carbohydrates
HANDEDNESS
is “handedness,” a form of isomerism?
YES
two classes of handedness based on their mirror images
SUPERIMPOSABLE
NONSUPERIMPOSABLE
Superimposable mirror images are also known as
ACHIRAL
Nonsuperimposable mirror
images are also known as
CHIRAL
images that coincide at all points when the images are laid upon each other
ACHIRAL / Superimposable mirror images
images where not all points coincide when the images are laid upon each other
CHIRAL / Nonsuperimposable mirror images
handedness generating carbon atom
CHIRAL CENTER
an atom in a molecule that has four different groups bonded to it in a tetrahedral orientation
CHIRAL CENTER
a molecule whose mirror images are not superimposable and have handedness
CHIRAL MOLECULE
molecule whose mirror images are superimposable and DO NOT possess handedness
ACHIRAL MOLECULE
TRUE / FALSE:
A chiral molecule is a molecule whose mirror images are not superimposable
TRUE
TRUE / FALSE:
Chiral molecules DO NOT have handedness
FALSE
TRUE / FALSE:
the body’s response to the right-handed form of the hormone epinephrine is 20 times greater than its response to the left-handed form
TRUE
the simplest type of carbohydrate and the building block for more complex types of carbohydrates
MONOSAC
TRUE / FALSE:
MONOSACS are almost always “left-handed”
FALSE
TRUE / FALSE:
Plants produce only right-handed monosaccharides
TRUE
TRUE / FALSE:
the building blocks for proteins, amino acids, are always right-handed molecules
FALSE
isomers that have the same molecular and structural formulas but differ in the orientation of atoms in space
Stereoisomers
two types of stereoisomers
Enantiomers
Diastereomers
Enantios meaning
OPPOSITE
stereoisomers whose molecules are non-superimposable mirror images of each other
Enantiomers
Left- and right-handed forms of a molecule with a single chiral center
Enantiomers
stereoisomers whose molecules are not mirror images of each other
Diastereomers
TRUE / FALSE:
Enantiomers are optically active
TRUE
a compound that rotates the plane of polarized light
optically active compound
is “dextro” Greek?
NO, LATIN
dextro meaning
right
chiral compound that rotates the plane of polarized light in a clockwise direction
dextrorotatory compound
a chiral compound that rotates the plane of polarized light in a counterclockwise
levorotatory compound
is Levo Latin?
YES
Levo meaning
LEFT
used to designate the handedness of enantiomers
D,L system
numbered starting at the carbonyl group end of the molecule, and the highest-numbered chiral center is used to determine D or L configuration
CARBON CHAIN
–OH is in the right
D-ISOMER
–OH is in the left
L-ISOMER
hydroxy group points to right
D-ISOMER
hydroxy group points to the left
L-ISOMER
2D structural notation for showing the spatial arrangement of groups about chiral centers in molecules
Fischer projection formula
Fischer projection formula is named after
Emil Fischer
how many carbon atoms are commonly found in nature (monosac)?
three - seven
three-carbon monosaccharide
TRIOSE
four-carbon monosaccharide
TETROSE
FIVE-carbon monosaccharide
PENTOSES
SIX-carbon monosaccharide
HEXOSES
Monosaccharides are classified based on the type of carbonyl group present
ALDOSES
KETOSES
a monosaccharide that contains an aldehyde functional group
aldose
they are polyhydroxy aldehydes
ALDOSE
a monosaccharide that contains a ketone functional group
ketose
they are polyhydroxy ketones
ketose
six-carbon monosaccharide with an aldehyde functional group
aldohexose
a five-carbon monosaccharide with a ketone functional group
ketopentose
Monosaccharides are also often called
SUGARS
Latin for Saccharide
Saccharum
what dose Saccharum mean?
SUGAR / SACCHARIDE
only difference between D glucose and D-galactose
carbon-4
single different makes D-glucose and D-galactose?
epimers
useful for describing the stereochemistry of sugars, but their long bonds and right angle bends do not give a realistic picture of the bonding situation in the cyclic forms, nor do they accurately represent the overall shape of the molecules
Fischer projection formulas
a two-dimensional structural notation that specifies the three-dimensional structure of a cyclic form of a monosaccharide
Haworth projection formula
resulting cyclic compounds of monosacs
cyclic hemiacetals or hemiketals
A cyclic monosaccharide containing a six-atom ring
pyranose
A cyclic monosaccharide containing a five-atom ring
furanose
only aldohexose is capable of having this kind of ring
Pyranose
only aldopentose and ketohexose are capable of forming this kind of a ring
furanose
alpha and beta forms are classified as?
ANOMERS
carbon atom that is bonded to an -OH group and to the oxygen atom in the heterocyclic ring
anomeric carbon atom