BioChem Flashcards

PreBoards (265 cards)

1
Q

Naturally occur in living organisms and consist mostly of
carbon, hydrogen, oxygen and nitrogen

A

BIOMOLECULES

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2
Q

Essential for various body functions & manufactured
within the body

A

BIOMOLECULES

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3
Q

Heterogenous group of organic compounds that are
insoluble in water and soluble in nonpolar organic
solvents.

A

LIPIDS

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4
Q

Nonpolar organic solvents

A

Diethyl ether
Acetic acid (very common)
Benzene
Hexane
CCl4 (Carbon tetrachloride)
Ethyl acetate
Chloroform

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5
Q

An important source of energy

A

LIPIDS

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6
Q

Naturally occur in most plants, microorganisms and
utilized as components of the cell membrane, energy
storage molecules, insulation and hormones.

A

Lipids

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7
Q

Glycerol + Fatty Acid

A

Lipids

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8
Q

Sparingly insoluble or insoluble but soluble in organic
solvents

A

Lipids

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9
Q

Lipids make up the membrane of the cell called

A

Lipid bilayer

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10
Q

Energy-rich molecules mostly made up of hydrocarbons.

A

Lipids

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11
Q

Fatty acids, glycerol, sphingosine, and sterol are its
primary building blocks

A

Lipids

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12
Q

Fat cells known as

A

Adipocytes

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13
Q

Compose the basic structure of all cell membranes (3)

A

Phosphoglycerides, sphingolipids and steroids

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14
Q

Monomer of Lipid

A

Fatty acid

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15
Q

Fatty Acids with a carbon chain in which all carbon-carbon bonds are single bonds

A

SATURATED FATTY ACIDS

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16
Q

Fatty acids with a carbon chain in which there is a
presence of one carbon-carbon double bond

A

MUFAs

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17
Q

Fatty acids with a carbon chain in which there is a
presence of 2 or more carbon-carbon double bond

A

PUFAs

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18
Q

When carbon chain length increases, solubility

A

decreases

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19
Q

Carbon chain length and the number of double bonds
present / degree of unsaturation determines a fatty
acid’s

A

melting point

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19
Q

Unsaturated fatty acid - Melting point decreases as
degree of unsaturation

A

increases

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20
Q

Energy-storage lipids

A

(Triacyglycerols)

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20
Q

Saturated fatty acid - Carbon length increases,
melting point

A

increases

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21
Q

Membrane Lipids

A

Phospholipids, Sphingoglycolipids, Cholesterol

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22
Q

Emulsification Lipids

A

Bile Acids

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23
Messenger Lipids
Steroid Hormones and Eicosanoids
24
Lipid formed by the esterification of three FA to a glycerol molecule
Triacylglycerols (TAGs)
25
Protective Coating Lipids
Biological Waxes
26
Mostly concentrated primarily in special cells known as Adipocytes
Triacylglycerols (TAGs)
27
Efficient at storing energy compared to glycogen because large quantities can be packed into a very small volume
Triacylglycerols (TAGs)
28
Most Abundant type of lipid in the body
Triacylglycerols (TAGs)
28
Triester formed from the esterification of glycerol with more than one kind of fatty acid molecule.
Mixed Triacylglycerol
29
Most biochemically important to TAGs and mixed TAG
Mixed Triacylglycerol
30
Semi-solid at room temperature
Fats
31
Generally obtained from animal sources: “animal fat”
Fats
32
Liquid at room temperature
Oils
33
Generally obtained from plant sources
Oils
34
Functions almost exclusively as components of the cell membrane and are not stored
Glycerophospholipids
35
most abundant type of membrane lipid
Phospholipids
36
A polar class of lipids
Glycerophospholipids
37
Also known as Lecithins
Phosphatidylcholines
38
Prevalent in cell membranes
Phosphatidylcholines
39
Waxy solid that form colloidal suspensions in water
Phosphatidylcholines
40
Dietary sources: Egg yolks and soybeans
Phosphatidylcholines
41
Also known as Cephalins
Phosphatidyethanolamines and phosphatidylserines
42
Lipids that contain one fatty acid and one phosphate group attached to a sphingosine molecule and an alcohol attached to a phosphate group
Sphingophospholipids
43
Found in all cell membranes and are important structural component of the myelin sheath
Sphingomyelins
43
Sphingophospholipids in which the alcohol esterified to the phosphate group is choline
Sphingomyelins
44
Presence of amide and glycosidic linkages
Sphingoglycolipids
45
Lipids that contain one fatty acid and one phosphate group attached to a sphingosine molecule
Sphingoglycolipids
46
Simplest sphingoglycolipids
Cerebrosides
46
A C27 steroid molecule that is a component of cell membranes and a precursor for other steroid – base lipids
CHOLESTEROL
46
Can undergo saponification reaction
Sphingoglycolipids
47
Occur primarily in the brain
Cerebrosides
48
Occurs both in the gray matter of the brain, as well as the myelin sheath
Gangliosides
49
Most abundant steroid in the human body
CHOLESTEROL
50
Serves as a precursor for several other important steroid molecules
CHOLESTEROL
51
carry cholesterol from the liver to various tissues
Low density lipoprotein (LDL)
52
“bad cholesterol”
Low density lipoprotein (LDL)
53
Carry excess cholesterol from tissues back to the liver
High density lipoprotein (HDL)
54
“good cholesterol”
High density lipoprotein (HDL)
55
Also known as “plasma membrane” because it is responsible for separating the cytoplasm of a cell form its surroundings.
Cell Membrane
56
A lipid-base structure that also controls the movement of substance into and out of the cell
Cell Membrane
57
Upto 80%of the mass of a cell is lipid material consisting primarily of the three types of membrane lipids:
➔ Phospholipids ➔ Glycolipids ➔ Cholesterol
58
components of cell membranes and they provide rigidity to the membrane
Cholesterol molecules
59
membrane protein - Penetrates the cell membrane
Integral membrane protein
60
No energy is required Transport process
Passive Transport & Facilitated Transport
60
membrane protein - Nonpenetrating membrane protein located on the surface of the cell membrane.
Peripheral membrane protein
61
Transport process in which a substance moves across a cell membrane by diffusion from a region of higher concentration to a region of lower concentration
Passive Transport
62
● Transport process in which a substance moves across a cell membrane, with the aid of membrane proteins ● Movements is from the higher concentration to a lower concentration
Facilitated Transport
62
Transport process in which a substance moves across a cell membrane, with the aid of membrane proteins, against a concentration gradient
Active transport
63
Energy is required Transport process
Active transport
64
A derivative of cholesterol that functions as a lipid-emulsifying agent in an aqueous environment of the digestive tract
Bile acids
65
A substance that can disperse and stabilize water insoluble substances as colloidal particles in an aqueous solution
Emulsifiers
66
Carries an amino acid attached to the side-chain carboxyl group with the aid of an amide linkage
Bile acids
67
A fluid that contains emulsifying agents secreted by the liver, stored in the gallbladder, and released into the small intestine during digestion
Bile
68
A biochemical substance that serves as a means of communication between various tissues
Hormone
69
Produced by a ductless gland
Hormone
70
Control the balance of Na+ and K+ ions in cells and body fluids
Mineralocorticoids
70
A hormone that use cholesterol derivative
Steroid Hormone
71
Major classes of steroid hormones - Regulate numerous biochemical process in the body
Adrenocorticoid hormone
71
Major classes of steroid hormones - Control reproduction and secondary sex characteristics
Sex hormones
72
Major mineralocorticoid
Aldosterone
73
○ Control glucose metabolism ○ Counteract inflammation
Glucocorticoid
74
metabolic precursor for most eicosanoids
Arachidonic acid
75
Major glucocorticoid
Cortisol
75
➔ Synthesized in the largest amount by adrenal glands ➔ Exert powerful anti-inflammatory effects in the body
Cortisol
76
Hormone – like molecules because they are not transported in the bloodstream to their site of action. Their effects are exerted in the tissues where they are synthesized
Eicosanoids
77
Have a very short “life”, as they are broken down into inactive residues within seconds of synthesis
Eicosanoids
78
a monoester of a long-chain fatty acid and a long-chain alcohol
Biological Wax
79
saturated fatty acids are present (may contain 14 – 36 carbon atoms)
Biological Wax
80
Alcohols found in biological waxes may either be saturated or unsaturated (may contain 16 – 30 carbon atoms)
Biological Wax
81
Weak polar head and 2 long nonpolar trails
Biological Wax
82
Salkowski's test
bluish red to purple
83
Liebermann Burchard test
(+) = red or pink-> purple- >blue -> bluish – green colour.
84
uses acetic anhydride and sulfuric acid
Liebermann Burchard test
85
contains one amino group , one carboxyl group, and a nonpolar side chain
Nonpolar Amino Acid
85
MOST ABUNDANT molecules in the cells after water
PROTEINS
86
An organic compound that contains both amino (-NH2) and carboxyl (-COOH) groups attached to the same Carbon atom
AMINO ACIDS
87
an amino acid that contains one amino group, one carboxyl group, and a side chain that is polar but neutral
Polar Neutral Amino Acid
88
an amino acid that contains one amino group and two carboxyl groups, the second carboxyl group being part of the side chain.
Polar Acidic Amino Acids
89
the side chain of a polar acidic amino acid bears a ________ charge
negative
90
an amino acid that contains two amino groups and one carboxyl group, the second amino group being part of the side chain.
Polar Basic Amino Acid
91
A molecule that has a positive charge on one atom and a negative charge on another atom, but which has no net charge
ZWITTERIONS
91
the -NH3 of the zwitterion loses a proton, and a negatively charged species is formed
In basic solution
91
the zwitterion accepts a proton to form a positively charged ion Zwitterions
In an acidic solution
92
Unbranched chain of Amino Acids
PEPTIDES
92
Chain of covalently linked amino acids
PEPTIDES
93
love hormone
OXYTOCIN
93
A covalent bond between the carboxyl group of one amino acid and the amino group of another amino acid
Peptide bond
94
plays a role in stimulating the flow of milk in a nursing mother
OXYTOCIN
95
regulates uterine contractions & lactation
OXYTOCIN
96
regulates the excretion of water by the kidneys
VASOPRESSIN
97
The hydrogen bonding present is intramolecular
ALPHA HELIX
97
are pentapeptide neurotransmitters produced by the brain and bind at receptor sites within the brain
Enkephalins
97
occurs when there are two nonpolar side chains close to each other
Hydrophobic Interactions
97
The overall three-dimensional shape of a protein that results from the interactions between amino acid side chains (R groups) that are widely separated from each other within a peptide chain.
TERTIARY STRUCTURE
97
Compact spherical molecules that are usually water soluble.
Globular Proteins
97
proteins whose molecules have peptide chains that are folded into spherical or globular shapes
Globular Proteins
97
Can undergo denaturation
Globular Proteins
97
A protein secondary structure in which two fully extended protein chain segments in the same or different molecules are held together by hydrogen bonds.
BETA - PLEATED SHEETS
97
also known as Antidiuretic Hormone (ADH)
VASOPRESSIN
97
can also affect blood pressure
VASOPRESSIN
97
* also known as Salt Bridges * always involved in the interaction between an acidic and basic side chain
Electrostatic Interactions
97
* can occur between amino acids with polar R groups * relatively weak and easily disrupted by changes in the pH and temperature
Hydrogen Bonds
97
antioxidant and protects cellular contents from oxidizing agents
GLUTATHIONE (Glu-Cys-Gly)
97
Protein secondary structure in which a single protein chain adopts a shape that resembles a coiled spring
ALPHA HELIX
98
The hydrogen bonds can either be intermolecular or intramolecular
BETA - PLEATED SHEETS
98
the strongest of the tertiary- structure interactions, result from the - SH groups of two cysteine residues reacting with each other to form a covalent disulfide bond
Covalent Disulfide bonds
99
Function as enzymes and intracellular signaling molecules
Globular Proteins
99
Organization among the various peptide chains in a multimeric protein
Quaternary structure
99
- found in hair , wool, skin, horns & fingernails - provide protective coating for organs - mainly made up of hydrophobic amino acid residues rendering them insoluble in water
Keratin
99
involved in iron transport in blood
Transferrin
99
regulatory hormone for controlling glucose metabolism
Insulin
99
Involved in oxygen storage in muscles
Myoglobin
99
found in blood vessels and ligaments
Elastins
99
● protein whose molecules have an elongated shape with one dimension much longer than the others. ● have simple, regular and linear structures ● such proteins have the tendency to aggregate together to form macromolecular structures ● provide support and & external protection
Fibrous Proteins
99
involved in immune system responses
Immunoglobulins
99
found in muscle tissue
Myosins
99
found in blood clots
Fibrin
99
- most abundant protein in the human body - major structural material in tendons, ligaments, blood vessels and skin - organic component of bones and teeth - Vit. C is needed for the synthesis
Collagen
99
● Is a disease that arise due to an inadequate diet and starvation. ● actually the result of a lack of protein in the diet. ● it is an acute form of childhood protein-energy malnutrition
Kwashiorkor
100
- also known as Beta- keratin - consists of small amino acid residue
Silk Fibroin
100
Involves the disruption and possible destruction of both the secondary and tertiary structures of a protein.
Denaturation
100
deficiency of collagen-processing-enzymes, or from mutations in the amino acid sequences of collagen types I, III or V.
Ehler's - Danlos syndrome
100
● Is also a heterogenous group of inherited disorders distinguished by bones that easily bend and fracture. ● Common features: retarded wound healing and a rotated and twisted spine leading a hump-back appearance
Osteogenesis Imperfecta
100
● Is a form of severe protein- energy malnutrition characterized by energy deficiency. ● caused by severe deficiency of nearly all nutrients, especially protein and carbohydrates
Marasmus
100
small organic molecule that serves as a cofactor in a conjugated enzyme
Coenzyme
100
Mutations in the Type II Collagen
Osteogenesis imperfecta congenita
100
the active site in the enzyme has a fixed, rigid geometrical conformation. Only substrates with a complementary geometry can be accommodated at such a site, much as a lock accepts only certain keys
LOCK-AND-KEY MODEL
100
Also known as Brittle bone syndrome
Osteogenesis Imperfecta
100
Mutations in the Type I Collagen
Osteogenesis imperfecta tarda
100
the inactive form of apoenzyme
proenzyme / zymoge
100
protein part of the conjugated enzyme
Apoenzyme
100
an enzyme with absolute specificity. It catalyzes the - conversion of hydrogen peroxide (H2O2) to O2 and H2O. Hydrogen peroxide is the only substrate it will accept
Catalase
100
biochemically active conjugated enzyme produced from an apoenzyme & a cofactor
Holoenzyme
101
allows for small changes in the shape or geometry of the active site of an enzyme to accommodate a substrate. A good analogy is the changes that occur in the shape of a glove when a hand is inserted into it.
INDUCED - FIT MODEL
101
it adapts to accept the incoming substrate
INDUCED - FIT MODEL
101
group-specific; it leaves amino acids, one at a time, from the carboxyl end of a peptide chain
Carboxypeptidase
101
temperature at which an enzyme exhibits maximum activity
Optimum temperature
101
a molecule that inactivates enzymes by forming a strong covalent bond to an amino acid side-chain group at the enzyme’s active site.
Irreversible inhibitor
102
hydrolyze phosphate-ester bonds in all types of phosphate esters
Phosphatases
102
slows or stops the normal catalytic function of an enzyme by binding to it
Enzyme Inhibitor
102
pH at which an enzyme exhibits maximum activity
Optimum pH
103
A molecule that sufficiently resembles an enzyme substrate in shape and charge distribution that it can compete with the substrate for occupancy of the enzyme’s active site.
Competitive inhibitor
103
Major function: components of coenzymes
B vitamins
103
A molecule that decreases enzyme activity by binding to a site on an enzyme other than the active site.
Noncompetitive inhibitor
103
produced in the skin of humans and animals by the action of sunlight (ultraviolet light) on its precursor molecule
Vitamin D3
104
combines with opsin protein to form the visual pigment rhodopsin which further converts light energy into nerve impulses that are sent to the brain
VITAMIN A
104
co-substrate in the formation of structural protein collagen
VITAMIN C
104
A three-subunit molecule in which a pentose sugar is bonded to both a phosphate group and a nitrogen-containing heterocyclic base
NUCLEOTIDES
104
Biomolecules that store and transmit genetic information in the cells Main function: Storage and expression of genetic information
NUCLEIC ACIDS
104
Primary function: Antioxidant – protects against oxidation of other compounds
VITAMIN E
104
Active in the formation of proteins involved in regulating blood clotting
VITAMIN K
104
○ Adenine ○ Guanine
Purine Derivatives
104
● primary structure of a nucleic acid ● sequence in which nucleotides are linked together in a nucleic acid
Nucleotide Sequence
105
Known as the "Working Copies" of DNA
RIBONUCLEIC ACID
105
Chemical basis of heredity & considered as the fundamental units of genetic information
DEOXYRIBONUCLEIC ACID
105
○ Thymine ○ Cytosine ○ Uracil
Pyrimidine Derivatives
105
A biological process that occurs in all living organisms and copies their DNA ; this is the basis for biological inheritance
REPLICATION
105
● The flow of information from DNA to RNA to protein ● DNA is the repository and directs its own replication ● DNA is transcribed into RNA ● mRNA is translated into a polypeptide gene product
CENTRAL DOGMA
105
ENZYMES involved: unwinds the supercoils
Topoisomerases
106
ENZYMES involved: unwinds the DNA double helix
DNA helicase
106
ENZYMES involved: join lagging strand together
DNA ligase
106
This is a process known to produce new DNA molecules
REPLICATION
106
The copying process, during which a DNA strand serves as a template
TRANSCRIPTION
107
enzyme responsible for copying DNA templates
DNA polymerase
107
components of ribosomes, the complexes that carry out the synthesis of proteins
rRNA
107
ENZYMES involved: works on 5' - 3' direction only
DNA polymerase
107
intermediaries, carrying genetic information from one or a few genes to a ribosome
mRNA
108
these are the stop signals
UAG, UAA, and UGA
108
start codon
AUG
108
adapter molecules that faithfully translate the information in mRNA into a specific sequence of amino acids.
tRNA
109
three letter word, that contains the information necessary for the synthesis of proteins
CODON
110
provides the template or blueprint for this process.
Messenger RNA
110
process when mRNA carries coded information to ribosomes
TRANSLATION
111
The altered information can cause changes in amino acid sequence during protein synthesis and thereby after protein function.
MUTATION
111
Errors in genetic information is passed on during transcription
MUTATION
112
An error in base sequence reproduced during DNA replication.
MUTATION
112
there is a change but the protein still codes for the same amino acid. There is no manifestation to the individual
SILENT MUTATION
113
A different codon is produced therefore it codes for a different amino acid
MISSENSE MUTATION
113
An inherited blood disorder that affects the shape of the red blood cells (a flawed hemoglobin)
SICKLE-CELL ANEMIA
114
Untreated individuals may give off a musty or mouse- like odor as a side effect of the build-up and excess phenylalanine in the body
Classic PKU
114
A stop codon is produced thereby also stopping protein synthesis
NONSENSE MUTATION
114
A rare genetic (inherited) condition caused by the mutation in the gene that aids in creating an enzyme known as Phenylalanine Hydroxylase. Due to this mutation, there is a phenylalanine build up in the body.
PHENYLKETONURIA
115
Genetic disorder that affects both the lungs and the digestive system.
CYSTIC FIBROSIS
115
People with this can develop a very thick and sticky mucus in their lungs, airways, and digestive system.
CYSTIC FIBROSIS
116
Trisomy 21 is the most common type of
DOWN SYNDROME
117
an hereditary disorder of the connective tissues which results to abnormally long and thin digits. People with this syndrome may also experience or develop optical and cardiovascular defects
MARFAN SYNDROME
118
Genetic condition where the affected person has an extra chromosome which can cause mild to serious physical and developmental problems.
DOWN SYNDROME
119
Considered as a rare chromosomal disorder which affects the male population. The affected person has a total of 47 chromosomes.
XYY SYNDROME (SUPER MALE)
120
In some cases, affected individuals develop behavioral problems such as an explosive temper, hyperactivity, impulsivity, defiant actions, or, in some cases, antisocial behavior
XYY SYNDROME (SUPER MALE)
120
There were many misconceptions about this disease. It was sometimes called the super- male disease because men with this syndrome were thought to be overly-aggressive and lacking in empathy.
XYY SYNDROME (SUPER MALE)
120
Are considered as the MOST ABUNDANT class of bioorganic molecules
CARBOHYDRATES
121
monosaccharides containing an aldehyde group
ALDOSES
121
Functions: ● Provides energy ● Storehouse of chemical energy ● Supply carbon atoms for the synthesis of other biochemical substances (lipids, nucleic acid, proteins)
CARBOHYDRATES
122
Utilized as a primary source of energy
D-GLUCOSE
122
Most important in a human nutritional standpoint
D-GLUCOSE
122
monosaccharides containing a ketone group
KETOSES
122
A polymeric carbohydrate that contain a large number of monosaccharide units joined to the next by one or more glycosidic bonds
POLYSACCHARIDES
122
Dextrose / Blood sugar
D-GLUCOSE
123
Contain 2-10 monosaccharide unit covalently bonded to each other
OLIGOSACCHARIDES
123
bond in a disaccharide resulting from the reaction between the hemiacetal carbon atom -OH group of one monosaccharide and an -OH group on the other monosaccharide
GLYCOSIDIC LINKAGE
123
grape sugar
D-GLUCOSE
123
Carbohydrates that contain two monosaccharides joined by a glycosidic bond
DISACCHARIDES
124
Play an important role in keeping blood glucose concentration within the normal range
INSULIN & GLUCAGON
125
● Produced as an intermediate in a hydrolysis reaction ● Contains two D-glucose monosaccharides ● Cannot be digested by humans or ferment by yeast
CELLOBIOSE
125
Low blood sugar level: pancreas secretes
GLUCAGON
126
High blood sugar level: pancreas secretes
INSULIN
127
Also known as “Malt sugar”
MALTOSE
127
Aka “milk sugar”
LACTOSE
127
AKA “Brain sugar”
D-GALACTOSE
127
Synthesized from glucose in the mammary glands for use in lactose
D-GALACTOSE
127
Present in many fruits and honey
D-FRUCTOSE
127
Present as a chemical marker that distinguishes types of blood
D-GALACTOSE
127
Most important ketohexose
D-FRUCTOSE
127
Aka levulose and fruit sugar
D-FRUCTOSE
127
Sweetest-tasting of all sugars
D-FRUCTOSE
128
Sometimes used as a dietary sugar
D-FRUCTOSE
128
a known component of RNAs and energy-rich compounds such as ATPs
D-RIBOSE
128
is classified as a pentose sugar
D-RIBOSE
128
Major sugar found in milk
LACTOSE
128
Produced whenever the polysaccharide starch breaks down
MALTOSE
128
MOST ABUNDANT out of all disaccharides
SUCROSE
128
Important ingredient in commercially produced infant formulas that are designed to stimulate mother’s milk
LACTOSE
129
Also known as “common table sugar”
SUCROSE
129
Produced commercially from juices of sugarcane and sugar beets
SUCROSE
130
These are carbohydrates that contain three to ten (3-10) monosaccharide units that are bonded together by glycosidic linkages
OLIGOSACCHARIDES
131
This is a non-reducing sugar
SUCROSE
132
● Polysaccharide containing only glucose units ● Form of stored glucose in human and animals
GLYCOGEN
133
Known as animal starch
GLYCOGEN
134
Ideal storage form for glucose
GLYCOGEN
135
Process wherein formation of glycogen occurs
Glycogenesis
136
Readily absorbs water, leading to softer stools and frequent bowel action
CELLULOSE
136
Takes place when blood glucose are sufficiently high.
Glycogenesis
136
- Occurs primarily in the liver - Stimulated by glucagon and epinephrine - Glycogen is broken down into glucose to provide immediate energy and to aid in the maintenance of blood glucose levels during fasting
Glycogenolysis
136
Most abundant naturally occurring polysaccharide
CELLULOSE
137
● Straight-chain glucose polymer ● Accounts for 15-20% of the starch
Amylose
137
Carbohydrate metabolism starts in the
MOUTH
137
● Similar to cellulose in both function and structure ● Gives rigidity to the exoskeleton of crabs, lobsters, shrimps, insects, and other arthropods ● Occurs in the cell wells of fungi
CHITIN
137
The major breakdown products of carbohydrate metabolism:
Glucose, Fructose, & Galactose
137
PRIMARY SITE for carbohydrate metabolism is the
SMALL INTESTINE
137
Desirable intake of dietary fiber
25g-35g
137
○ Branched glucose polymer ○ Accounts for 80-85% of the starch
Amylopectin
137
Monosaccharide unit: galactose, glucose, and fructose
RAFFINOSE
137
Monosaccharide units: galactose, glucose, fructose, and an additional galactose
STACHYOSE