Exam 8: An Introduction to Metabolism

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is known as

Which of the following shows the correct changes in thermodynamic properties for a chemical reaction in which amino acids are linked to form a protein?

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -Which of the following represents the activation energy required for the enzyme-catalyzed reaction?

Which of the following statements regarding enzymes is True?

What term is used to describe the transfer of free energy from catabolic pathways to anabolic pathways?

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -Assume that the reaction has a △G of -5.6 kcal/mol. Which of the following would be True?

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -Which of the following represents the difference between the free-energy content of the reaction and the free-energy content of the products?

Chemical equilibrium is relatively rare in living cells. Which of the following could be an example of a reaction at chemical equilibrium in a cell?

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -In order to attach a particular amino acid to the tRNA molecule that will transport it, an enzyme, an aminoacyl-tRNA synthetase, is required, along with ATP. Initially, the enzyme has an active site for ATP and another for the amino acid, but it is not able to attach the tRNA. What must occur in order for the final attachment to occur?

Which of the following is considered an open system?

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -Which of the following is likely to lead to an increase in the concentration of ATP in a cell?

For living organisms, which of the following is an important consequence of the first law of thermodynamics?

Which of the following metabolic processes can occur without a net influx of energy from some other process?

The following questions are based on the reaction A + B → C + D shown in Figure 8.2. -What is substance X?

Use the following information to answer the following questions. Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. -What is the purpose of using malonic acid in this experiment?

Which of the following is True for all exergonic reactions?

Living organisms increase in complexity as they grow, resulting in a decrease in the entropy of an organism. How does this relate to the second law of thermodynamics?

Whenever energy is transformed, there is always an increase in the

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

The mathematical expression for the change in free energy of a system is △G =△H-T△S. Which of the following is (are)correct?