Chapter 8 - Metabolism Flashcards
when chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?
it is lost to the environment
which temperature and pH profile curves on the graphs were most likely generated from analysis of an enzyme from a human stomach where conditions are strongly acid?
curves 1 and 4
assume that the reaction in Figure 8.1 has delta 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 the system
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
which of the following is an example of potential rather than kinetic energy?
a molecule of glucose
whenever energy is transformed, there is always an increase in the
entropy of the universe
which of the following is a statement of the first law of thermodynamics?
energy cannot be created or destroyed
which of the following is true of enzymes?
enzymes increase the rate of chemical reaction by lowering activation energy barriers
which of the following statements is true concerning catabolic pathways?
they supply energy, primarily in the form of ATP, for the cell’s work
for the hydrolysis of ATP to ADP + Pi, the free energy change is -7.3 kcal/mol under standard conditions (1 M concentration of both reactants and products); in the cellular environment, however, the free energy change is about -13 kcal/mol; what can we conclude about the fre energy change for the formation of ATP from ADP and Pi under cellular conditions?
it is about +13 kcal/mol
