AP Bio chapter 8
which of the following represents the activation energy required for the enzyme catalyzed reaction?
B
which of the following represents the activation energy required for an non catalyze reaction?
C
which of the following would be the same in an enzyme catalyzed or non-catalyzed reaction?
D
Succionare dehydrogenase catalyze a the conversion of succionare to fumarate. The reaction is inhibited by melodic acid, which succionare but cannot be acted upon by succionare dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the effect of malonic acid. Based on this information, which of the following is correct?
Succinate is the substrate, and fumarate is the product
which of the following is an example of potential rather than kinetic energy?
a food molecule made up of energy-rich macromolecules
which of the following is an example of cooperativity?
a molecule binding at one unit of a tetramer, allowing faster binding at each of the other three
Some enzymatic regulation is allosteric. In such cases, which of the following would usually be found?
an enzyme with more than one subunit
which of the following is considered an open system
an organism
how does a non-competitive inhibitor decrease the rate of an enzyme reaction?
by changing the shape of the enzyme
which curve was most likely generated from analysis of an enzyme from a human stomach where conditions are strongly acidic?
curve 4
Which of the following represents the delta G of the reaction?
d
A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because
the activation energy barrier for this reaction cannot be surmounted.
When glucose monomers are joined together by glycosidic linkages to form a cellulose polymer, the changes in free energy, total energy, and entropy are as follows
+ΔG, +ΔH, -ΔS.
during a laboratory experiment, you discover that an enzyme catalyzed reaction has a delta G of -20 kcal/ mol. If you double the amount of enzyme in the reaction m, what would be the delta G for the new reaction?
-20 kcal/ mol
The mathematical expression for the change in free energy of a system is delta G equals delta H minus T Delta S. Which of the following is correct?
Delta G is the change in free energy
Which best describes the reaction?
The amount of free energy released as a result of the catalyzed reaction is indicated by "d"
According to the induced fit hypothesis of enzyme catalysis, which of the following is correct?
The binding of the substrate changes the shape of the enzymes active site
which of the following statements is (are) true about enzyme catalyzed reactions?
The reaction is faster than the same reaction in the absence of the enzyme
which of the following is true for all exergonic reactions?
The reaction proceeds with a net release of free energy
Assume that the reaction has a △G of -5.6 kcal/mol. Which of the following would be true?
The reaction would result in an increase in entropy (S) and a decrease in the total energy content (H) of system
which of the following is (are) true for anabolic pathways
They consume energy to build up polymers from monomers.
A series of enzymes catalyze the reaction X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. What is substance X?
a substrate
Which of the following statements describes enzyme cooperativity?
a substrate molecule bound to an active site affects the active site of several subunits.
reactants capable of interacting to perform products in a chemical reaction must first overcome a thermodynamic barrier known as the reaction's
activation energy
how can one increase the rate of a chemical reaction?
add a catalyst
Substance A functions as
an allosteric inhibitor
which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
catabolism
when you have a severe fever, what may be a grave consequence if this is not controlled?
change in the folding of enzymes
Zinc, and essential trace elements for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a
cofactor necessary for enzyme activity
Increasing the substrate concentration in an enzymatic reaction could overcome which of the following?
competitive inhibition
which curve represents the behavior of an enzyme taken from a bacterium that lives in Hot Springs at temperatures at 70°C or higher?
curve 3
which of the following types of reactions would decrease the entropy within a cell?
dehydration reaction
A chemical reaction that has a positive delta G is correctly described as
endergonic
which of the following statements regarding enzymes is true?
enzymes increase the rate of reaction.
which of the following is true of enzymes?
enzymes increase the ratio of chemical reaction by lowering activation energy barriers
Which of the following terms best describes the reaction?
exergonic
The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is known as
feedback inhibition
what is the purpose of using my Lanik acid in this experiment?
it is a competitive inhibitor
which of the following best describes the reaction?
negative delta G, spontaneous
what is the change in free energy of a system at chemical equilibrium?
no net change