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Biochemistry Exam 3
An overview of Biochemsitry, from a tired student's perspective.
54
Biochemistry
Undergraduate 4
12/08/2011

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Term
What is Zymogen?
Definition
Inactive enzyme precursor.
Term
How do you calculate the rate enhancement ratio?
Definition
rate enhancement = rate catalyzed/rate uncatalyzed)
Term
Serine proteases use what to catalyze the cleavage of peptide bond?
Definition
Proximity and orientation, covalent catalysis, base catalysis, and electrostatic catalysis.
Term
What the 'catalytic triad' in chymotrypsin consists of what?
Definition
SER, HIS, ASP
Term
alpha-amylose has what type of conformation?
Definition
helix
Term
What is Chitin?
Definition
2 N-acetylglucosamines
Term
Bacterial cell walls are made of?
Definition
Peptidoglycans
Term
Cellulose has what type of conformation? (structure)
Definition
Linear beta(1-4) linkage
Term
What is the Lineweaver-burk equation?
Definition
1/v0 = (Km/Vmax)(1/[s])+(1/Vmax)
Term
What are all the catalytic mechanisms?
Definition
Proximity and orientation, metal-ion, covalent catalysis, acid-base catalysis, and electrostatic catalysis.
Term
The formation of Schiff base is a property of?
Definition
Covalent catalysis.
Term
Decarboxylation of acetoacetate produces?
Definition
Schiff base via nucleophilic attack on substrate.
Term
The catalytic mechanism of bovine pancreatic enzyme RNase A relies on acid-base catalysis involving which amino acid?
Definition
Histidine.
Term
What is acid catalysis?
Definition
Acid donates protons lowering the free energy of the transition state
Term
What type of amino acid does not provide a side-chain for acid-base catalysis?
Definition
Non-Polar
Term
What is le Chats rule?
Definition
A+B <=enzyme=> C+D+enzyme
Term
Chymotrypsin relies on what to cleave a bulky non-polar side chain?
Definition
Relies on its small hydrophobic side chains (its pocket). [Does not have charge, or sulfylhydral groups]
Term
The step with the greatest delta G is the?
Definition
Rate determining step.
Term
Alcohol dehydrogenase catalyzes the conversion of ?
Definition
Formaldehyde
Term
How does competitive inhibition effect Km?
Definition
Increases Km
Term
How does uncompetitive inhibition effect Km?
Definition
Decreases Km and Vmax
Term
How does mixed inhibition effect Km?
Definition
Decreases Vmax, or may (in/de)crease Vmax
Term
What type of slope does uncompetitive inhibit exhibit?
Definition
Parallel
Term
What type of slope does mixed inhibition exhibit?
Definition
Intersection and shows divergent parallelism.
Term
What type of slope does competitive exhibit?
Definition
Intersection at 1/Vmax
Term
What does lysozyme catalyze?
Definition
beta(1-4) glycosidic linkages
Term
When do second-order reactions occur?
Definition
When two reactant collide, dawg.
Bimolecular.
Term
What type of reaction is unimolecular?
Definition
First-order.
Term
How do cells control or regulate the flux through metabolic pathways?
Definition
Allosteric control of enzymes, covalent modification of enzymes, and genetic control of the concentrations of enzymes.
Term
What type of reaction depends on its initial concentration?
Definition
Second-order
Term
What compound has the highest oxidation number?
Definition
Carbon Dioxide. (+4)
Term
Whats the second-order half-life equation?
Definition
t1/2=1/([A]0 * k)
Term
What is the first-order half-life?
Definition
t1/2=ln(2)/k
Term
How is trypsinogen converted to trypsin?
Definition
Via proteolysis of trypsinogen.
Term
What is the Michaelis-Menten Equation for no inhibitor?
Definition
v0 = Vmax[S] / (Km+[S])
Term
What is the Michaelis-Menten Equation for competitive inhibitor?
Definition
v0 = Vmax[S] / (aKm+[S])
Term
What is the Michaelis-Menten Equation for uncompetitive inhibitor?
Definition
v0 = Vmax[S] / (Km+a'[S])
Term
What is the Michaelis-Menten Equation for mixed inhibitor?
Definition
v0 = Vmax[S] / (aKm+a'[S])
Term
What is Km?
Definition
The concentration of the substrate that half saturates the enzyme.
Term
The cyclic five membered ring of sugar is...
Definition
furanose
Term
What is the measure of the catalytic efficiency of an enzymatic reaction?
Definition
kcat/km
Term
What allosteric effector of ACTase acts as an inhibitor?
Definition
CTP
Term
The ubiquitous chemistry of acetyl-CoA is centerered on...
Definition
its thioester bond.
Term
What is the oxidized and reduced forms of Flaven Adenine dinucleotide?
Definition
FADH2, FAD (reduced, oxidized respectively)
Term
When [S] = Km, what is v0=?
Definition
vo=.5Vmax
Term
What is the Keq equation?
Definition
Keq = e ^ (-deltaG / RT )
Term
What is the formula for deltaG?
Definition
deltaG = deltaG0 + RTln(CD/AB)
Term
What factor contributes to the large negative standard free energy change of the reaction ATP->ADP+phosphate
Definition
The decrease in negative in repulsion.
Term
What is the equation for the catalytic constant?
Definition
kcat = Vmax / Et
Term
What is a reducing sugar?
Definition
A reducing sugar has a hydroxide group in the upper right quadrant.
Term
What is the structure of Maltose?
Definition
H OH
|-RING-RING-|
OH H
Term
What is the structure of Lactose?
Definition
OH OH
|-RING-RING-|
H H
Term
Hexose D rings normally assume what?
Definition
Chair conformation
Term
Hexose binding the lysozyme distors the D ring, making a.....
Definition
Half-Chair conformation.
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