CH3 Assessment (KIN223)

The net result of a single glycolysis run is the formation of

2 NADH and 2 ATP.

Under anaerobic conditions, the end-product of glycolysis is converted to

lactic acid

Which of the following best describes the reduction of the coenzyme NAD+?

NAD+ + H -> NADH

Enzymes are

proteins

Which of the following binds to the active site of an enzyme?

Substrate

Which of the following correctly represents the mechanism of enzyme function?
E = enzyme
S = substrate
P = product

E + S -> E-S -> E-P -> E + P

organic cofactors

not attached to enzymes and have specific functions in assisting enzymes. coenzymes

inorganic cofactors

attached to the enzyme and are required for their normal function. zinc bound to carbonic anhydrase

Three molecules that are important energy storage locations in the body are

ATP, glycogen, and triglyceride.

When we shiver on a cold day, the heat produced by muscle tissue is a demonstration of

the second law of thermodynamics.

The reaction in which water and carbon dioxide combine to form carbonic acid is

reversible, and can proceed in either direction depending on the concentrations of the molecules

The breakdown of H2CO3 into CO2 and H2O is catalyzed by an enzyme called carbonic anhydrase. Which of the following is a reactant in this reaction?

H2CO3

When the body's digestive system breaks down starch, a complex carbohydrate, into simpler carbohydrates, the reaction is

catabolic and exergonic.

ATP formation

is endergonic and requires the presence of fuel molecules such as glucose.

Enzyme regulation by negative feedback involves

allosteric inhibition of an enzyme by a product of its metabolic pathway.

A group of enzymes that are physically attached to one another is referred to as a(n)

1) multienzyme complex.

2) phosphate complex.

3) allosteric pathway.

4) metabolic pathway

When an enzyme catalyzing a catabolic reaction changes conformation to an induced fit with the substrate,

it stresses chemical bonds in the substrate, making it easier to break them.

Which enzyme class transfers electrons from one substance to another?

Oxidoreductase

Which answer lists the steps of enzyme action in correct order?

Formation of enzyme-substrate complex, induced fit, formation or breakage of chemical bonds, release of product

In the final step of enzymatic catalysis,

the products are released and the enzyme is free to bind other substrates.

Which statement accurately describes the effects of substrate and enzyme concentrations on reaction rate?

An increase in either substrate or enzyme concentration will increase the reaction rate.

Which enzyme system allows for regulation at a single site and also diminishes the chance that a needed substrate will diffuse away from a catalyst?

1) Multienzyme complex

2) Metabolic pathway

The first stage of cellular respiration is

glycolysis, and it occurs in the cytosol.

The coenzymes that will provide the electrons needed for the electron transport system are

NADH and FADH2.

Which stage of cellular respiration is catalyzed by pyruvate dehydrogenase?

Intermediate stage

The enzyme that harnesses the energy of H+ diffusion down its concentration gradient within a mitochondrion to make high-energy molecules for the cell is

ATP synthase.

Pyruvate dehydrogenase is located in the

the matrix of the mitochondrion

If oxygen levels drop such that glucose metabolism becomes primarily anaerobic, then the amount of ATP produced per glucose molecule will

decrease to much less than half of what it was.