1. Sarin acts on acetylcholinesterase by forming a strong covalent bond with a residue in the enyzme's active site. This is an example of what kind

1. Sarin acts on acetylcholinesterase by forming a strong covalent bond with a residue in the enyzme's active site. This is an example of what kind of regulation?

A. allosteric inhibition

B. positive allosteric regulation

C. competitive inhibition

D. feedback inhibition

2. Hemoglobin has 4 subunits. When an oxygen molecule binds to a subunit of hemoglobin, it changes the structure of neighboring hemoglobin subunits, increasing the affinity of the neighboring subunits for oxygen. This is an example of what kind of effect?

A. allosteric inhibition

B. positive allosteric regulation

C. competitive inhibition

D. feedback inhibition

3. What kind(s) of interactions would you expect to see when a substrate first comes into contact with an enzyme active site, before any active site chemistry can occur?

A. hydrogen bond

B. ionic interactions

C. covalent

D. A and B are both true

E. A, B, and C are all true

4. _______ is the final electron acceptor in cellular respiration, which means that it is ______

A. glucose, oxidized

B. glucose, reduced

C. oxygen, oxidized

D. oxygen, reduced

5. n the process of cellular respiration, which is the correct order of energy flow that results in ATP synthesis?

A. Chemical potential energy in bonds of glucose, electron carriers, H+ gradient

B. Chemical potential energy in bonds of glucose, H+ gradient, electron carriers

C. H+ gradient, chemical potential energy in bonds of glucose, electron carriers

D. H+ gradient, electron carriers, chemical potential energy in bonds of glucose

6. The proton gradient that powers ATP synthase is

A. High inside the mitochondrial matrix, and low in the intermembrane space

B. Low inside the mitochondrial matrix, and high in the intermembrane space

C. Low in the intermembrane space, and high inside the cytoplasm

D. High in the intermembrane space, and low inside the cytoplasm

7. an enzyme increases the rate of a reaction

A. by decrease the overall free energy change of the reaction

B. by changing the free energy of the products only

C. by changing the free energy of the reactants only

D. by decreasing the overall activation energy of a reaction

8. in cells, the oxidation of organic compounds by molecular oxygen (to produce CO2 and water) releases free energy. This is because

A. Electrons are being moved from atoms that have a lower affinity for electrons (such as oxygen) to atoms that have a higher affinity for electrons (such as carbon)

B. The covalent bond in O2 is unstable and easily broken by electrons from organic molecules.

C. the free energy of the reactants is smaller than the free energy of the products so the change in free energy is negative

D. none of the above are true