Exam 3 Long Version Flashcards
1
Q
Enzyme
A
the biological chemical reaction catalyst. In the context of this chapter, an enzyme is an example of a bioactive protein
2
Q
Insulin
A
A major metabolic hormone that is secreted in response to feed consumption and elevated blood glucose. In the context of this chapter, insulin is an example of a hormone whose structure is a protein
3
Q
Amino acid
A
the fundamental “building block” of protein structure. There are 20 common amino acids in feeds and foods, and additional examples in animal tissues. Each amino acid contains an amino group on one side of the molecule and a carboxyl group on the other. Of the 20 different amino acids, there are 20 different “side chains” which are structures bonded to the same centralized carbon atom as the amine and carboxyl groups
4
Q
Side chain
A
the structure on an amino acid that distinguishes it from the other 19 amino acids
5
Q
Peptide
A
a protein that consists of less than 10 amino acids
6
Q
Peptide bond
A
the amide bond that bonds amino acid to the next in a protein. Recall that the peptide bond occurs as a reaction between a carboxyl group and an amine group
7
Q
Hydrolysis
A
in the context of this chapter, hydrolysis refers to the breaking of a peptide bond (amide bond) such that a water molecule is introduced into the reaction
8
Q
Primary structure of a protein
A
the sequence of amino acids in the protein. Do not confuse sequence with composition.
Sequence is the order in which the amino acids occur from one end of the protein to the other.
9
Q
Secondary structure of a protein
A
this refers to the changes in conformation or three dimensional structure that the protein begins to form as the primary structure grows.
Examples of secondary structure include helix and pleated sheets. These difference are determined by the primary structure because it’s the side chains of the amino acids that interact to form different three dimensional configurations
10
Q
Tertiary structure of a protein
A
this refers to the final three dimensional structure of the protein after it has been synthesized. In order for tertiary structure to occur and be maintained, amino acid side chains interact with one another in specific locations through different types of bonding: hydrogen bonds, electrostatic interactions between polar residues, and by covalent bonds between Cys residues that form disulfide bonds.
11
Q
Quaternary structure of a protein
A
this type of structure refers to two or more complete proteins combining to form a larger protein in which the individual proteins represent subunits of the larger, complete protein. Not all complete and functional proteins have quaternary structure. An example of a protein with quaternary structure is hemoglobin.
12
Q
Glycine
A
An amino acid with a hydrogen atom as its side chain
13
Q
Non-polar side chains
A
These are side chains of amino acids in which there is no polarity or charge.
14
Q
Amino acids with non-polar side chains include: (8)
A
- Alanine (Ala)
- Valine (Val)
- Leucine (Leu)
- isoleucine (Ile)
- Proline (Pro)
- Tryptophan (Trp)
- Phenylalanine (Phe)
- Methionine (Met)
15
Q
Imino group
A
Basically, an amino acid molecule contains an amine group. There is an “amino” acid in which the amine group is bonded to the central carbon of the amino acid, as well as to a carbon atom in the side chain such there is no true amino group. Such a nitrogen containing group is a “imino” group, and the amino acid identified with this type of structure is proline (Pro).
16
Q
Polar side chains
A
these are amino acid side chains that contain polar groups, either positive or negative polarities (or charges).
17
Q
Amino acids with polar side chains include: (4)
A
three amino acids contain hydroxyl groups:
- Serine (ser)
- Threonine (thr)
- Tyrosine (tyr)
and one amino acid contains a thiol group
- Cystein (cys)
18
Q
Polar acid side chains (2)
A
- Glutamic acid (glu)
- Aspartic acid (asp)
19
Q
Polar basic side chains (5)
A
three amino acids have amino groups on their side chains
- Glutamine (gln)
- Aspargine (asn)
- Lysine (lys)
one has an imino group on its side chain
- Histidine (his)
and one has a combination of amino and imino groups on its side chain
- Arginine (arg)
20
Q
genetic code
A
the code for all proteins that is determined by the sequence of nucleic acids in the animal’s DNA
21
Q
Transcribe
A
to copy from one form to another. In the context of this chapter, transcribing or transcription refers to reading the genetic code of the DNA and re-writing it chemically in a form that can then be directly used for making the protein designated by the genetic code
22
Q
Nucleotide sequence
A
the sequence of the four nucleotides in DNA: adenine, guanine, thymine and guanine
23
Q
Messenger RNA
A
the chemical copy of the genetic code of a small section of the DNA. When the genetic code section is transcribed, the result is the messenger RNA (mRNA). The “messege” is therefore written chemically in a form that can move to a location in the cell where a protein can be synthesized; this form is mRNA
24
Q
Ribosome
A
a organelle in the cell outside of the nucleus where proteins are synthesized in a manner consistent with the genetic code as chemically written as the mRNA
25
Translation
the process in which the message of the genetic code that occurs (was transcribed) as mRNA is converted to a protein. For this process, an amino acid that occurs in conjunction with a sequence of three nucleotides will be used to build the new protein. In this way, the genetic code is translated into amino acid sequence specific for a give protein as indicated by the genetic code
26
Codon
A sequence of three nucleotides in the mRNA. For every amino acid there will be a specific sequence of three nucleotides. Therefore, the order that the nucleotides occur will determine the order of the amino acids that are added to the growing protein. In this way, the cell takes the genetic code, transcibes it into large groups of codons that ultimately determine which amino acids which will be used and in what order (sequence).
27
Post-translation modification
any changes to the structure of a protein after the initial translation of the gentic code to amino acid sequence has occurred. This is common for most proteins and involves number elaborate reaction steps
28
Sickle cell anemia
a genetic disease in which the primary structure of the protein subunits (quaternary structure) of hemoglovin is altered. In this dcondition, a glutamic acid (carboxylic acid side chain) is replaced with a valine (non-polar side chain). The resulting tertiary and quaternary structures cause the proteins to clump and take on a sickle shape. This also reduce the ability of the hemoglobin to bind oxygen; hence the anemia that also characterizes the condition.
29
Bioactive Molecule
any molecule in the animal's cell or circulation that causes or induces a biochemical reaction. The best example of a bioactive molecule is an ***enzyme***. Other examples include ***hormones***, ***hemoglobin***, ***myoglobin***, and ***contractile proteins (muscle).***
30
Essential Amino Acids
Any amino acid that cannot be made at all or in sufficient quantities to meet the requirements of the animal
1. Arg- Arganine
2. His- Histadine
3. Ile- Isoleucine
4. Leu- Leucine
5. Lys- Lysine
6. Met- Methanomine
7. Phe- Phenoalanine
8. Thr- Threonine
9. Trp- Tryptophan
1. Val- Valine
31
Non-essential amino acid
Amino acids that can be synthesized by the animal and thus do not need to be in the diet
32
Indispensable Amino acid
these are the same amino acids listed for essential amino acids. In non-ruminant animals, the essential and indispensabe amino acids are the same. In a ruminant, ruminal microbes convert dietary proteins to microbial proteins, which contain the essential amino acids, and do so regardless of the dietary amino acid composition. Thus, ruminant animals do not need to consume the essential amino acids; however, the essential amino acids are not made by the animal itself. Therefore, they remain *indespensable* to the animal.
33
enzymes
Specialized proteins of the cell that serve as the true reaction catalyst. Virtually all reactions have a specific enzymes. Enymes are at the root of metabolism and often it is an enzyme thatis the cause or result of disease
34
activation energy
the reaction energy required to initiate a biochemical reaction to the point that conversion to product(s) begins
35
transition state
the progression through the biochemical reaction where product formation occurs
36
substrates
the materials that are involved in the initial part of the biochemical reaction. Substrates are the same as reactants of a chemical reaction
37
Products
the end result of the biochemical reaction. the materials that occur from the reaction; materials could represent a single product of synthesis or multiple products of a degradation reaction, for example, hydrolysis
38
enzyme-substrate complex
often abbreviated as the ES complex, it represents the initial substance that develops when a substrate and the enzyme combine at the first part of the biochemical reaction
39
active site
the part of the enzyme's three dimensional structure where the actual biochemical reaction takes place. The active site is where the substrate initially interacts with the enzyme to form the ES complex
40
Lock and Key Model
the theoretical mechanism of an enzyme and substrate interaction in which the substrate "fits" into the active site of the of the enzyme specifically based on the three dimensional structures of the substrate and the active site
41
Induced fit model
the theoretical mechanism of an enzyme and substrate interaction in which the first substrate that encounters enzyme causes a change in the enzyme's three dimensional conformation so that subsequent interaction with more substrate occurs rapidly
42
Enzyme Specificity
different enzymes are synthesized to catalzye specific reactions. Usually, two different types of enzymes will not catalyze the same reaction.
43
glycosidic bond
in the context of this chapter, a glycosidic bond is an ether bond connecting two glucose molecules. There are two types of glycosidic bonds, alpha and beta
44
denatured protein
a protein that has lost its tertiary structure, mainly through *disruption* of **hydrogen bonds** and **altered** **electrostatic interactions**
45
Hydrolase
a class of enzyme that catalyzes a hydrolysis reaction
46
Isomerase
a class of enzyme that catalyzes a change in the structure of a molecule without changing its fomula
47
Ligase
a class of enzyme that catalyzes formation of obnds between carbon or other atoms
48
Lyase
a class of enzyme that catalyzes breaking of bonds between carbon atoms, as well as other atoms such as S and N
49
Oxidoreductase
a class of enzyme that catalyzes reactions involving oxidation and reduction
50
dehydrogenase
a class of enzyme that catalyzes oxidation and reduction reactions; this is an example of an oxidoreductase. However, there are numerous reactions involving different specific dehydrogenase enzymes
51
Transferase
a class of enzyme that catalyzes the transfer of certain functional groups from one molecule to another
52
First order catalysis
a type of catalysis in which the rate of the reaction is directly proportional to the concentration of substrate when the concentration of enzyme is held constant
53
allosteric enzyme catalysis
a type of enzyme catalysis in which the first substrates bind slowly and then the subsequent substrate bind rapidly and in proportion to the concentration of substrate
54
Sigmoidal Plot
a graph in which the curve is "S" shaped
55
Hyperbola
a graph in which the curve is a straight line through the origin
56
Competitive inhibition
inhibition of an enzyme catalyzed reaction in which the inhibitor material has a shape similar to the real substrate and inhibits by binding to the active site. With half and half substrate and competitive inhibitor, the two will compete for binding to the active site of the enzyme and result in about half the rate of product formation comparaed to the reaction with no inhibitor
57
Vmax
abbreviation for the maximum velocity of the enzyme catalyzed reaction. As the concentration of substrate increases, the reaction rate increases until the concentration of substrate has saturated all of the enzyme active sites, at which point, the reaction velocity slows down to a slope of the line of essentially zero
58
Km
abbreviation for a term called the "Michaeles Constant". A Km is a value representing the concentration of substrate that supports a reaction velocity of one half the maximum velocity for that enzyme (Km= concentration for 1/2 Vmax)
59
Non-competitive inhibition
reaction inhibition in which the inhibitor binds to a location on the enzyme that is different from the substrate binding site (active site). The ability to bind substrate is not reduced, but the reaction velocity is decreased (Km is the same, but the Vmax is decreased)
60
Allosteric regulation
regulation of enzymes that have multiple binding sites for substrates and for regulatory substances
61
Positive effector
a regulatory substance that affects an allosteric enzyme by increasing reaction velocity
62
Negative effector
a regulatory substance that affects an allosteric enzyme by decreasing reaction velocity
63
Feedback Regulation
inhibition of an enzyme by a substance that is synthesized by a sequence of enzyme catalyzed reactions and in which the enzyme inhibited is the first one in the sequence. Usually, the substance synthesized is utilized so it does not accumulate; however, when need for the substance is decreased, it will accumulate. Thus, inhibition of the first enzyme in the sequence will slow down production of substance until more is needed by the cell.
64
Covalent Modification
regulation of an enzyme's activity by bonding of a molecule to the enzyme via a covalent bond. The best example is the bonding of a phosphate to an enzyme through a phosphate ester created from the reaction of the phosphate and an alcohol on a serine of the enzyme protein. Some enzymes are more active and some are less active when this happens.
65
Phosphorylation
enzyme catalyzed addition of a phosphate molecule to another molecule, for example, addition of a phosphate to serine of an enzyme
66
Glycogen
a carbohydrate found in animal tissues that stores glucose for use as an energy substrate. Glycogen concentration is very very low because animals do not rely on store glucose for the bulk of their energy reserves (fat serves this purpose)
67
Hormone-sensitive lipase
an enzyme found in muscle and fat cells that catalyzes hydrolysis of carboxyl ester bonds of fat. This enzyme is an example of one that increases in activity when it is phosphorylated
68
Coenzymes
Non-protein substances that interact with enzymes to promote the biochemical reaction. Some minerals and most water soluble vitamins are coenzymes
69
carbohydrate
substances that include starch, cellulose, and other materials that represent food, feed, and structural compononts. The basic structure has a formula CH2O and is best characterized by glucose
70
Glucose
a molecule containing six carbon atoms with a formula (CH2O)6. Glucose is the principle carbohydrate of starch, cellulose, and glycogen, and is the carbohydrate of "blood sugar".
71
Gluconeogenesis
This is a sequence of biochemical reactions in which a molecule of glucose is synthesized from starting materials that are not carbohydrates. For example, some amino acids, propionate from the rumen, and glycerol from recycled fat can be converted into glucose in the liver of animals through gluconeogenesis
72
Energy
a term that is used to describe substrates that are used to produce molecules that, upon their hydrolysis generate the ability to do work or perform reactions the results a physical action.
73
alpha-glycosidic bond
the covalent, ether bond that connects glucose molecules of starch
74
beta-glycosidic bond
the covalent, ether bond that connects glucose molecules of cellulose
75
empirical formula
the most basic formula for a molecule or type of molecule. For example, all carbohydrates have an empirical formula of CnH2On where "n" is the number of C or H2O
76
Monosaccharide
a sugar that contains a single carbohydrate molecule. For example, a single molecule of glucose is a monosaccharide
77
Triose
A monosacccharide that consists of a three-carbon carbohydrate
78
Tetrose
A monosaccharide that consists of a four-carbon carbohydrate
79
Pentose
A monosaccharide that consists of a five-carbon carbohydrate
80
Hexose
A monosaccharide that consists of a six-carbon carbohydrate
81
Heptose
a monosaccharide that consists of a seven-carbon carbohydrate
82
Polymer
a large structure made up of the same basic molecule
83
Oligosaccharide
A carbohydrate polymer in which there are about ten molecules
84
Polysaccharide
a carbohydrate polymer in which there are many molecules. For example, starch is a large polymer of glucose
85
Disaccharide
a two-molecule polymer carbohydrate. For example, sucrose, a table sugar, is a disaccharide containing one glucose and one fructose
86
Polyhydroxide aldehyde
a molecule that contains two functional groups, alcohol and an aldehyde; however there are many alcohol groups on the molecule
87
polyhydroxy ketone
a molecule that contains two functional groups, alcohol and a ketone; however, there are many alcohol groups on the molecule
88
Aldose
any monosaccharide that is a polyhydroxide aldehyde. For example, a single molecule of glucose is an aldose
89
Ketose
any monosaccharide that is a polyhydroxide ketone. for example, a single molecule of fructose is ketose
90
glyceraldehyde
a three-carbon aldose
91
dihydroxyacetone
a three-carbon ketose
92
Aldohexose
a six-carbon aldose. Glucose is an aldohexose because it is a six carbon aldose
93
Hemiacetal
when a single aldohexose forms a cyclic or ring structure, the alcohol group of carbon number six reacts with the aldehyde group to connect the ends. This is the hemiacetal.
94
Hemiketal
when a single ketohexose, such as fructose, forms a cyclic or ring structure, the alcohol of carbon number six reacts with the ketone group to connect carbon number six with the ketone at carbon number two. This is hemiketal.
95
Anomeric carbon
the carbon atom in the cyclic structureof a hemiacetal that orginally was the aldehyde-carbon. for the cyclic structure of glucose (the ehmiacetal) the anomeric carbon is always carbon number one
96
Glycosides
carbohydrate polymers that are formed through ether linkages (glycosidic bonds) connecting the various monosaccharides. For example, starch, cellulose, and even sucrose (a disaccharide) are glycosides
97
Full acetal
when the anomeric carbon atom of a monosaccharide hemiacetal bonds to the alcohol of a different monosaccharide to form the ether linkage, the bonding changes from the hemiacetal to the full acetal. The full acetal, therefore is the ether linked glycosidic bond
98
Cellulose
A large glucose polymer in which the glycosidic bonds of the full acetal have an orientation is refferred as the beta-glycosidic bond. Cellulose is common in cotton, wood, and forages
99
Homopolysaccharide
A polysaccharide in which all of the monosaccharide units are the same molecule. For example, glycogen is a homopolysaccharide because each of the monosaccharide units is represented by only glucose
100
Heterpolysaccharide
a plysaccharide in which the monosaccharide units are not all the same molecule
101
Starch
a glucose polysaccharide in which the ether linked glucose molecules have the alpha-glycosidic bond orientation. Starch is common in corn, wheat, and other cereal grains
102
Amylose
a glucose polymer linked together by only alpha-glycosidic bonds between carbon-one (anomeric carbon) of one molecule and carbon-four of the other molecule-- the alpha (1--\>4) glycosidic bond; amylose is a polysaccharide
103
Amylopectin
amylose that also contains branches in which glucose units are connected via alpha(1--\>6) glycosidic bonds
104
Glycogen
the storage form of glucose in animal tissues. Structurally, glycogen is the same as amylopectin; however, in glycogen there are more branches.
105
Cellulase
an enzyme produced by microorganisms, for example ruminal bacteria, that catalyzes hydrolysis of beta (1--\>4) glycosidic bonds of cellulse
106
ferment
the breakdown of a nutrient by microbes. In the rumen, microbes will produces enzymes that hydrolyze glucose molecules from starch and cellulose and then they will break the glucose down (ferment it) to generate energy and additional substrates for their continued growth. Fermentation produces byproducts that the host will use as well. In the rumen, fermentation of glucose will produce VFA for the host animal to use.
107
Gluconeogenesis
synthesis of new glucose from starting materials (precursors) that are not carbohydrates
108
ATP
adenosine triphosphate
109
Amylase
an enzyme taht catalyzes hydrolysis of the alpha(1--\>4) glycosidic bond (ether linkage) of amylose (starch)
110
Debranching enzyme
an enzyme that catalyzes hydrolysis of the alpha(1--\>6) glycosidic bond (ether linkage) of amylopectin and glycogen
111
Enterocyte
absorptive cell of the small intestine
112
Active transport
the transport or movement of digested nutrients into the enterocyte by methods that require the energy supplied by ATP. Active transport also a means of transporting materials across membranes of other tissues in the body
113
Sodium-glucose co-transporter
A transport system in which glucose is transported into the cell along with sodium ion, which is then transported out of the cell using the energy of ATP hydrolysis (active transport)
114
Hepatic portal vein
The large blood vessel that transports nutrients from the gasto-intestinal tract to the liver
115
Energy nutrient
a nutrient that is used (oxidized) for the purpose of generating ATP
116
Insulin
A hormone primarily secreted from the beta-cells of the pancreas in response to digestion and absorption of glucose. Insulin stimulates cells of many tissues to transport glucose from the blood (glucose that originated from the diet) into the cells of the body
117
Glucose transporter
specialized proteins found in the membranes of many tissue cells that are used for transport of glucose across the cell membrane
118
Glycolysis
directly translate as "breaking glucose". Biochemically glucose is modified and split into two three-carbon molecules, each one ultimately becoming the molecule, pyruvate.
119
Cytosolic
in the cytosol of the cell. The cytosol is the area within the cell and between/ surrounding the organelles, as well as not part of the nucleus
120
Anaerobic
directly translated as "without air". Describes metabolism in which oxygen is not directly needed
121
Aerobic
requirig air. Describes metabolism in which oxygen will be directly needed
122
Lactate
a three-carbon molecule that originates from glucose and that occurs after glycolysis in an anaerobic cell type. Lactate is produced from pyruvate so that NAD+ can be regenerated
123
Pyruvate
a three-carbon molecule that is the end product of glycolysis regardless of the cell type (aerobic and anaerobic); if anaerbic, pyruvate is converted to lactate
124
Mitochondrea
the cell organelle where oxidative metabolism takes place
125
Acetyl-CoA
acetate that has coenzyme-A bonded to the caboxyl end via a thioester. Acetyl-coA is the molecule that represents the starting point for ATP generation if energy is needed, as well as for fatty acid synthesis if nutrient supply is excessive. If energy is needed, glucose, fatty acids, and some amino acids are broken down by metabolic processes (catabolism) that result in their conversion to acetyl-CoA, which then is oxidized in the mitochondria for production of ATP. If the glucose and certain amino acids are in nutrient excess, the acetyl-CoA, which then is oxidized in the mitochondria for production of ATP. If the glucose and certain AA are in nutrient excess, the acetyl-CoA is diverted to fatty acid production so that the nutrient energy supply can be stored
126
Glucose-6-phoshpate
product of the first reaction of glycolysis
127
hexokinase
the enzyme that catalyzesconversion of glucose to glucose-6-phosphate. Hexokinase aslo is the rate-limiting enzyme of glycolysis
128
ATP hydrolysis
hydrolysis of a phosphate from ATP, which results in ADP and phosphate. ATP hydrolysis produces energy that is used to drive other biochemical reactions
129
Kinase
an enzyme that catalyzestransfer of a phosphate either to ADP to produce ATP or from ATP to another molecule. Kinase is a class of enzyme, and there are numerous kinases specific to certain reactions
130
ADP
adenosin diphosphate
131
Rate-limiting enzyme
the enzyme that catalyzes the reaction that determines the rate at which subsequent reactions occur. THis is usually relevant to a series or sequence of reactions that produce specific end products, for example, glycolysis. Also, the rate-limiting enzyme is the primary enzyme that is regulated by inhibitors or activators
132
Fructose-6-phosphate
the product of the second reaction in glycolysis and which glucose-6-phosphate is converted
133
Isomerization
conversion of a molecule to another of the same formula, for example, glucose-6-phosphate to fructose-6-phosphate
134
Glucose-phosphate isomerase
the enzyme that catalyzes isomerization of glucose-6-phosphate to fructose-6-phosphate
135
Fructose-1,6-bisphosphate
fructose with two phosphates. Each phosphate is bonded to a different part of Fructose (carbons 1 and 6)
136
phosphofructokinase
the kinase enzyme that catalyzes transfer of a phosphate to carbon number 1 of fructose-6-phosphate
137
Committed step
the step or reaction of a metabolic pathway in which the product will only go to completion of specific route. For example, some reaction sequences have points in which a product can go in different directions because more than one possible reaction sequence occurs. However, once a product in the middle of a reaction sequence reaches a point of "no return" or deviation to another end product, it becomes committed. once glucose is converted to fructose-1,6-bisphosphate, it can only proceed to convert to pyruvate
138
glyceraldehyde-3-phosphate
the product of the fourth reaction of glycolysis in which the six-carbon fructose-1,6-bisphophate is split into two three-carbon molecules; one is glyceraldehydes-3-phosphate
139
dihydroxyacetone phosphate
the other three-carbon molecule that is produced when fructose-1,6-bisphosphate is split
140
Aldolase
The enzyme that catalyzes the splitting of fructose-1,6-bisphosphate into the two 3-carbon molecules
141
triose phosphate isomerase
the enzyme that catalyzes conversion (isomerization) of dihydroxyacetone phosphate into glyceraldehyde-3-phosphate
142
Nicotinamide adenine dinucleotide (NAD)
an enzyme cofactor that is involved with oxidation and reduction reactions. NAD can be reduced to form NADH; the NADH can be oxidized to form NAD
143
Reduction
The addition of hydrgen ion to a molecule
144
Oxidation
The removal of hydrogen ions from a molecule
145
1,3- bisphosphoglycerate
the product of phosphorylation of glyceraldehyde-3 phosphate in the sixth reaction of glycolysis
146
L-lactate
refers to the lactate isomer that is produced in the rumen and that is metabolized by the liver and heart
147
D-lactate
the lactate isomer that is also produced in the rume but that is not metabolized fast enough and tends to be excreted in the urine
148
Acidosis
the condition characterized by low blood pH and which is caused primarily by a buildup of lactic acid (usally the D-lactate isomer)
149
Mitochondria
the organelle where pyruvate and fatty acid oxidation occur
150
Pyruvate dehyrogenase compled (PDH)
the enzyme system located in the mitochodrial membrane taht catalyzes conversion of pyruvate to acetyl-CoA
151
Flavin Adenine Dinucleotide FAD
an enzyme cofactor that is involved in oxidation and reduction reactions in cellular metabolism much like NAD/NADH. The reduced form of FAD is FADH2
152
Tricarboxylic Acid Cycle TCA
the metabolic pathway that completes the oxidation of acetyl-CoA, and which occurs in the mitochondria. This metabolic pathway is called a cyle beause the last product produced is the starting material for the next turn of the reaction pathway. The TCA cycle also is called the Krebs cycle in honor of Hans Krebs and the Citric Acid cyle because the first product of the reaction pathway is citric acid. Overall, the TCA cycle complete the oxidation of glucose and fatty acids
153
Oxaloacetate
the final product of the TCA cycle, it condenses with Acetyl-CoA to form the first product of the cycle, citrate
154
Citrate
the first product of the TCA cycle, citrate is a molecule with three caboxylic acid groups, hence the name tricaboxylic acid
155
Isocitrate
Conversion product of citrate early in the TCA cycle
156
Oxalosuccinate
Conversion product of isocitrate in the TCA cycle
157
alpha-ketoglutarate
conversion product of oxalosuccinate in the TCA cycle
158
Succinyl-CoA
conversio product of alpha-ketoglutarate in the TCA cycle
159
guanine diphosphate GDP
a nucleotide diphosphate that will be converted to GTP during the TCA cycle. The phosphate of GTP will immediately be transferred to ADP producing ATP and regenerating GTP
160
Succinate
the conversion product of succinyl-CoA in the TCA cycle. This reaction also is associated with phosphorylation of GDP
161
Malate
conversion product of succinate in the TCA cycle
162
Fumerate
conversion product of malate in the TCA cycle
163
Energy potential
This refers to the energy harbored in ATP, as well as NADH and FADH2 that will be used to power cellular functions in the animal
