Coleman UTT Exam 3 prep

During celluar respiration, NADH ...

• is converted to NAD⁺ by an enzyme called dehydrogenase

•  

  is the final electron acceptor 

•  

  delivers its electron load to the first electron carrier molecule.

•  

  is reduced to form NADP⁺

• is chemically converted to ATP

The oxygen consumed during cellular respiration is involved directly in which process or event?

• glycolysis

• the citric acid cycle

• the phosphorylation of ADP to form ATP

• accepting electrons at the end of the ETC

• the oxidation of pyruvate to acetyl CoA

in an oxidation-reduction reaction, how is the reducing agent changed?

• It loses electrons and gains potential energy.

• It loses electrons and loses potential energy

• It gains electrons and gains potential energy.

• It gains electrons and loses potential energy

Which of the following sequences represents the correct order in which metabolic reactions occur during the complete oxidation of glucose through aerobic respiration?

• glucose → glycolysis → citric acid cycle → pyruvate oxidation → electron transport chain

• glucose → pyruvate oxidation → citric acid cycle → glycolysis → electron transport chain

• glucose → pyruvate oxidation → glycolysis → electron transport chain → citric acid cycle

• glucose → citric acid cycle → glycolysis → pyruvate oxidation → electron transport chain

• glucose → glycolysis → pyruvate oxidation → citric acid cycle → electron transport chain

inside an active mitochondrion, most electrons follow which of the following pathways?

• citric acid cycle → ATP → NADH → oxygen

• citric acid cycle → NADH → electron transport chain → oxygen

• NADH → oxidative phosphorylation → ATP → oxygen

• citric acid cycle → FADH2→ electron transport chain → ATP

• electron transport chain → citric acid cycle → ATP → oxygen

Which of the following terms describes metabolic pathways that break down complex molecules to release stored energy?

• endergonic pathways

• anabolic pathways

• bioenergetic pathways

• catabolic pathways

The mechanism by which the end product of a metabolic pathway inhibits an enzyme that catalyzes an earlier step in the pathway is most precisely described as ...

• competitive inhibition

• cooperativity inhibition

• feedback inhibition

• irreversible inhibition

Cooperativity is a form of allosteric activation in which ...

• completion of one step in a metabolic pathway is required before a subsequent step can occur.

• all of the enzymes in a metabolic pathway are contained within a single multienzyme complex.

• the product of a metabolic pathway serves as a competitive inhibitor of an early enzyme in the pathway

• binding of a substrate molecule to one active site in a multisubunit enzyme stimulates the binding of substrate molecules to the active sites of other subunits.

Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as ________ is to ________.

• exergonic; endergonic

• free energy; entropy

• exergonic; spontaneous

• work; energy

Based on the first law of thermodynamics, which of the following statements about a living organism is true?

• The organism ultimately must obtain all of the necessary energy for life from its environment.

• An organism grows by converting energy into organic matter

• the entropy of an organism decreases with time as the organism grows in complexity.

• The energy content of an organism is constant