Cellular Energetics AP

Cellular Energetics Quizziz Practice

Unit 3

Multiple Choice

The mitochondrion is a critical organelle structure involved in cellular respiration. Which of the structural components in the mitochondrion is the primary location of the Krebs cycle?

• inner membrane

• matrix

• intermembrane space

• outer membrane

Multiple Choice

Binding of Inhibitor Y inhibits a key catalytic enzyme by inducing a structural conformation change. Which of the following accurately describes the role of Inhibitor Y?

• Inhibitor Y competes with substrate of active site and acts as competitive inhibitor

• Inhibitor Y binds allosterically and acts as competitive inhibitor

• Inhibitor Y competes with substrate for active site acting as noncompetitive inhibitor

• Inhibitor Y binds allosterically and acts noncompetitive

Multiple Choice

Enzymes act as a catalyst to speed up chemical reactions and to __________

• increase activation energy

• decrease activation energy

• improve metabolism

• speed up reactions

Multiple Choice

How many net ATP would be generated directly from glycolysis from the breakdown of 2 glucose molecules?

• 2

• 4

• 8

• 12

Multiple Choice

Glycolysis does not require oxygen to occur in cells. However, under anaerobic conditions, glycolysis normally requires fermentation pathways to occur to continue to produce ATP. Which best describes why glycolysis is dependent on fermentation under anaerobic conditions?

• glycolysis requires fermentation to produce more glucose as a substrate

• glycolysis requires fermentation to synthesize lactic acid and restore NADH to NAD+

• glycolysis requires fermentation to generate ATP molecules to complete the early steps of the pathway

• glycolysis requires fermentation to generate pyruvate for a later step in the pathway

Multiple Choice

Which of the following most accurately describes the net reaction of glycolysis?

• is an endergonic process because it results in a net increase in energy

• is an exergonic process because it results in a net increase in energy

• is an endergonic process because it results in a net decrease in energy

• is an exergonic process because it results in a net decrease in energy

Multiple Choice

The biggest difference between an enzyme-catalyzed reaction and an uncatalyzed reaction is that

• free energy between the reactants and the products does not change

• free nergy difference between the reactants and products does not change

• the reaction would not occur without the enzyme

• a different amount of energy is required to reach the transition state of the reaction

Multiple Choice

The Second Law of Thermodynamics states that entropy, or disorder, is constantly increasing in the universe for spontaneous processes. Therefore, how is it possible that organisms exist in very ordered states?

• the second law of thermodynamics states does not apply to biological life

• energy can be created or destroyed

• catabolic reactions are always equal and opposite of the anabolic reactions

• biological life actually creates an increase in entropy through dissemination of heat and waste