Exam 6: An Introduction to Metabolism

Hydrolysis of ATP releases energy, which results in the production of ADP and inorganic phosphate. What is commonly the immediate fate of the inorganic phosphate in the cell?

Which of the following statements regarding enzymes is true?

Figure 6.2 Rate of an enzyme-catalyzed reaction as a function of varying reactant concentration, with the concentration of enzyme held constant. -For the enzyme-catalyzed reaction shown in Figure 6.2, which of these treatments will cause the greatest increase in the rate of the reaction if the initial reactant concentration is 1.0 micromolar?

If an enzyme is added to a solution in which its substrate and product are in equilibrium, what will occur?

Which of the following statements is representative of the second law of thermodynamics?

ATP is an example of which of the following?

Which of the following tend(s) to release energy?

Figure 6.1 -Cells use the ATP cycle shown in Figure 6.1 to

An aminoacyl-tRNA synthetase is the enzyme that catalyzes the attachment of a particular amino acid to its corresponding tRNA. This reaction requires energy from ATP. The enzyme initially binds the amino acid and ATP, but it is unable to bind the tRNA. Which of the following would be a likely mechanism by which the enzyme ultimately binds the tRNA and attaches the amino acid?

Please use the following information to answer the question(s) below. A series of enzymes catalyze the reactions illustrated in the following metabolic pathway: 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. -With respect to the enzyme that converts X to Y, substance A functions as

Which of the following statements is a logical consequence of the second law of thermodynamics?

A mutation that results in a single amino acid substitution in a region of the enzyme outside of the active site

A mutation that results in a single amino acid substitution in the active site of an enzyme

The following question(s) are based on the reaction A + B ↔ C + D shown in Figure 6.4. Figure 6.4 -Which of the following represents the difference between the free-energy content of the reactants and the free-energy content of the products in Figure 6.4?

Energy transformations are always associated with an increase in the

The following question(s) are based on the reaction A + B ↔ C + D shown in Figure 6.4. Figure 6.4 -Which of the following represents the activation energy needed for the noncatalyzed reverse reaction, C + D → A + B, in Figure 6.4?

Figure 6.2 Rate of an enzyme-catalyzed reaction as a function of varying reactant concentration, with the concentration of enzyme held constant. -In Figure 6.2, why does the reaction rate plateau at higher reactant concentrations?

A noncompetitive inhibitor decreases the rate of an enzymatic reaction by

A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because