11750350
Descripción
Test por Christina Marshall, actualizado hace más de 1 año
|
Creado por Christina Marshall
hace más de 6 años
|
|
Pregunta 1
Pregunta
Reactions that release free energy are
Respuesta
-
exergonic
-
spontaneous
-
endergonic
-
endothermic
-
both a and b
Pregunta 2
Pregunta
Enzymes speed up reactions by
Respuesta
-
providing chemical energy to fuel a reaction
-
lowering the activation energy necessary to initiate the reaction
-
causing an endergonic reaction to become an exergonic reaction
-
substituting one of the reactants necessary for the reaction
-
none of the above
Pregunta 3
Pregunta
For the idealized reaction aA + bB === cC + dD, suppose that the equilibrium constant Keq, is 0.01. If the starting concentration for A,B,C, and D are 1 M each, what would you predict will happen based on the value of Keq?
Respuesta
-
The forward reaction is favored
-
The reverse reaction is favored
-
The forward reaction is fast
-
The reverse reaction is fast
-
Both b and d are correct
Pregunta 4
Pregunta
Researchers analyzed a cell extract-- a mixture of molecules isolated from cells-- and studied a chemical reaction in which a carbohydrate was broken down into smaller molecules. When they added a protease to the cell extract, the discovered that the protease greatly inhibited the rate of the reaction. Based on this observation, you could conclude that the reaction is
Respuesta
-
exergonic
-
endergonic
-
catalyzed by an enzyme
-
catalyzed by a ribozyme
-
Both b an dc are true of this reaction
Pregunta 5
Pregunta
In biological systems, ATP functions by
Respuesta
-
providing the energy to drive endergonic reactions
-
acting as an enzyme and lowering the activation energy of certain reactions
-
adjusting the pH of solutions to maintain optimal conditions for enzyme activity
-
regulating the speed at which endergonic reactions proceed
-
interacting with enzymes as a cofactor to stimulate chemical reactions
Pregunta 6
Pregunta
In a chemical reaction, NADH is converted to NAD+ plus H+. W easy that NADH has been
Respuesta
-
reduced
-
phosphorylated
-
oxidized
-
decarboxylated
-
methylated
Pregunta 7
Pregunta
Currently, scientists are identifying proteins that use ATP as an energy source by
Respuesta
-
determining whether those proteins function in anabolic or catabolic reactions
-
determine is the protein has a known ATP-binding site
-
predicting the free energy necessary for the protein to function
-
determining if the protein has an ATP synthase subunit
-
all of the above
Pregunta 8
Pregunta
For a particular chemical reaction, an inhibitor raises the Km, but does not affect the Vmax. This inhibitor
Respuesta
-
is a competitive inhibitor
-
is a noncompetitive inhibitor
-
binds to the active site of the enzyme
-
binds to an allosteric site of the enzyme
-
is a competitive inhibitor and binds to the active site of the enzyme
Pregunta 9
Pregunta
Which of the following is (are) key benefits of catabolic reactions?
Respuesta
-
Recycling of organic building blocks
-
Breakdown of organic molecules to obtain energy
-
Synthesis of important polymers, such as polypeptides
-
All of the above
-
a and b only
Pregunta 10
Pregunta
Autophagy provides a way for cells to
Respuesta
-
degrade entire organelles and cycle their components
-
control the level of ATP
-
engulf bacterial cells
-
export unwanted organelles out of the cell
-
inhibit the first enzyme in a metabolic pathway
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.