Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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- PEP and 2-PG have similar amounts of potential
metabolic energy with respect to decomposition to Pi, CO2 and H2O, but the enolase reaction:
|
a. |
creates a much more unstable reactive intermediate. |
|
b. |
rearranges 2-PG to a form with greater binding potential to the enzyme. |
|
c. |
rearranges 2-PG into a form from which more potential energy can be released by hydrolysis. |
|
d. |
changes the DG of the reaction to increase the potential energy. |
|
e. |
none are true. |
2.Lactate produced by anaerobic muscle tissue is:
|
a. |
stored in muscle until oxygen is available. |
|
b. |
further reduced to glycerol in muscle. |
|
c. |
transferred to erythrocytes to release oxygen from hemoglobin. |
|
d. |
carried by the blood to the liver for gluconeogenesis and converted to glucose. |
|
e. |
none of the above. |
3. Which of the following enzymes is NOT used when fructose is metabolized to pyruvate in the liver?
|
a. |
triose phosphate isomerase |
|
b. |
glyceraldehyde-3-phospate dehydrogenase |
|
c. |
glucokinase |
|
d. |
phosphofructokinase-1 |
|
e. |
pyruvate kinase |
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- Which of the followingdescribe superior properties of enzymes (biological catalysts) over traditional chemical catalysts? a. They are mostly and generally operative under mild temperature, pressure, and pH conditions b. They are regulated only by substrate concentration c. They do not effect the reaction equilibrium, but lower the reaction's activation energy d. They are recycled at the end of the reaction Choose all that applyarrow_forwardThe enzyme -catalyzed reaction ratewill be increased if the energy level of ES can be increased by all EXCEPT: destabilization of ES by strain loss of entropy due to binding of E and S. destabilization of ES by distortion destabilization of ES by solvation destabilization of ES by electrostatic effects a. b. с. d. е.arrow_forwardSome cool enzyme (CE) catalyzes the conversion of compound F to compound A. Which of the following must be true of CE? Choice 1 of 4: CE can facilitate conversion of compound A into compound F. Choice 2 of 4: CE binds more tightly to the substrate F than to the product A. Choice 3 of 4: CE decreases the energy of the transition state between compounds F and A. Choice 4 of 4: CE facilitates net conversion of F to A whenever F is present.arrow_forward
- Which of the following which of the following reactions is an endergonic reaction that could occur in a cell, but only if coupled to the hydrolysis of ATP? ( delta G= -32 kJ/ mol)?arrow_forwardMatch each reaction description to the type of enzyme that catalyzes the reaction. 1. Oxidation and reduction of compounds 2. Transfers a functional group from one compound to another compound 3. Utilizes water to break bonds within a compound 4. Addition/removal of a group of atoms and bonds within a compound 5. Forms a bond between two compounds A. Ligase B. Transferase C. Hydrolase D. Oxidoreductase E. Isomerase F. Lyasearrow_forwardWhich of the following statements concerning ATP is true? a. The free energy value for the hydrolysis of ATP is nearly the same for ADP. b. The free energy value for the hydrolysis of ATP is greater than that for ADP. c. ATP hydrolysis is more likely at pH 5 than at pH 7. d. One mole of glycerate-1,3-bisphosphate can phosphorylate one mole of AMP to yield ATP.arrow_forward
- Transforming sucrose into glucose and galactose is an example of a catabolic process. b. a. an anabolic process. C. energy of motion. d. potential energy. e. kinetic energy- aarrow_forwardThe enzyme phosphoglycerate mutase promotes which of the following? a. the hydrolysis of 3-phosphoglycerate b. the isomerization of 3-phosphoglycerate c. the oxidation of 3-phosphoglycerate d. the reduction of 3-phosphoglyceratearrow_forwardWhich of the following is incorrect about the enzyme chymotrypsin? a. It catalyzes the addition of water across a double bond O b. It is known as a serine protease O c. Artificial substrates are used to monitor the reaction catalyzed by the enzyme d. It is classified as a hydrolasearrow_forward
- Using understanding of the thermodynamics laws, explain the energy transformations for the following processes. a. Glucose – Pyruvase + 2ATF + 2NADH b. Pyruvate – Acetyl-CoA + NaDH c. Citric acid – Oxoloacetate + 3NaDH + FADH2 + ATP d. H20 at PSII – ATP e. Photon at PSI – NADPH f. Co2 + RuBp – 3PG + ATP + NADPH – G3P (1/6 of which is converted to glucose)arrow_forwardANSWER A AND B PLSarrow_forwardConsider the following free energy diagram for an uncatalyzed and enzyme-catalyzed reaction. Select all the statements that are true. Without enzyme With enzyme A+B Time AB Oa. The reaction is now spontaneous due to the addition of enzyme b. The rate of the enzyme catalyzed reaction is faster than the uncatalyzed reaction O C. The reaction is exergonic O d. The change in free energy for the reaction is greater in the catalyzed reaction, compared to the uncatalyzed reaction e. The enzyme stabilizes the transition state for the reaction Released Energy pesarrow_forward
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