Question

7) Why do hydrolysis reactions occur more readily in solution than dehydration reactions? A) Hydrolysis reactions increase G, or Gibbs free energy of the system, B) Hydrolysis reactions are endergonic and increase entropy of the system. C) Hydrolysis reactions are exergonic and decrease entropy of the system. D) Hydrolysis reactions are exergonic and increase entropy of the system. 8) How do cells use the ATP cycle illustrated in the figure? AAA W A) Cells use the cycle to recycle ADP and phosphate. B) Cells use the cycle to recycle energy released by ATP hydrolysis. C) Cells use the cycle to recycle ADP, phosphate, and the energy released by ATP hydrolysis. D) Cells use the cycle primarily to generate heat. 9) Which of the following statements describes a key component of the induced fit hypothesis of enzyme catalysis? A) Substrate binds to an allosteric site rather than to the active site of an enzyme. B) Binding of an inhibitor molecule changes the shape of the active site of an enzyme. C) Binding of an activator molecule changes the shape of the active site of an enzyme. D) Binding of substrate to the active site changes the shape of the active site of an enzyme. 10) During which of the following metabolic processes is most of the CO2 from the catabolism of glucose is released? A) glycolysis B) electron transport C) oxidation of pyruvate to acetyl-CoA D) the citric acid cycle 11) When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom, the molecule becomes A) dehydrogenated B) oxidized C) reduced D) redoxed 12) In chemiosmosis, what is the most direct source of energy that is used to convert ADP +Pito ATP? A) energy released as electrons flow through the electron transport chain B) energy released from substrate-level phosphorylation C) energy released from movement of protons through ATP synthase, down their electrochemical gradient D) energy released as electrons are transported across the inner mitochondrial membrane

Answer 1

7.

Hydrolysis reactions occur more readily in solution than dehydration reactions because   D. Hydrolysis reactions are exergonic and increase entropy of the system.

Hydrolysis is a process in which polymers breaks into monomers using a water molecule. So it increases the disorder of the system i.e. entropy increases. This process also produces energy, so it is exergonic reaction.

8.

The ATP cycle illustrated in the figure  C. Cells use the cycle to recycle ADP, phosphate, and the energy released by ATP hydrolysis.

9.

Key components of the induced fit hypothesis of enzyme catalysis is D. Binding of substrate to the active site changes the shape of the active site of an enzyme.

10.

During D. The citric acid cycle most of the CO2 from the catabolism of glucose is released.

In The citric acid cycle 4 CO2 released during the oxidation of Pyruvate 2 CO2 is released. So the answer is citric acid cycle.

11.

When a molecule of NAD+gains a hydrogen atom, the molecule becomes C . Reduced .

Addition of an hydrogen ion or gaining of electron or loss of oxygen atom from a molecule is called as reduction reaction. The molecule becomes reduced.

12.

In chemiosmosis, the most direct source of energy that is used to convert ADP + Pi to ATP C. energy released from movement of protons through ATP synthase, down their electrochemical gradient.