Catalytic proteins bind and facilitate biochemical reactions at: a. The alloster

Question

Catalytic proteins bind and facilitate biochemical reactions at:

a. The allosteric site

b. The inhibitor site

c. The active site

d. The polymerization site

.

In DNA, _____ are positioned on the surface of the molecule, facing the aqueous cytoplasm, while _____ are hidden in the central core of the molecule.

a. Sugars and phosphates; nitrogenous bases

b. Sugars and nitrogenous bases; phosphates

c. Nitrogenous bases; sugars and phosphates

d. Phosphates; sugars and phosphates

.

The most high-energy electrons are released from glucose during

a. Glycolysis

b. Proton pumping

c. Pyruvate oxidation

d. Krebs/TCA cycle

Explanation / Answer

1) The Active site

Active site:- a restricted region of the enzyme molecule where it binds to the substrate, typically a pocket or groove on the surface of the enzyme where catalysis occurs, usually formed by only a few of the protein's amino acids, enzyme is not a stiff structure instead "dances" between different shapes in a dynamic equilibrium with slightly different free energy in each "pose"

2) Nitrogenous bases; sugars and phosphates

In DNA,Nitrogenous bases are positioned on the surface of the molecule, facing the aqueous cytoplasm, while sugars and phosphates are hidden in the central core of the molecule.

3) Proton pumping

The driving force of the proton pump is the reduction of the protein with electrons transferred to the protein from NADH. These electrons carry energy and the energy is transferred to the pump and allows it to transport hydrogen ions (protons) across the inner mitochondrial membrane. The proton pump is a type of active transport. The pump requires energy to transport the protons that it receives, not from ATP, but rather from electrons transferred from NADH. It pumps protons across the membrane against their concentration gradient. The proton pump can also be viewed as couple transport because the actions of the proton pump are coupled to the actions of ATP synthase so even though both processes are not functioning in the same protein pump, they are coupled transport systems.

It produce 32 atp.

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