Quiz #5 Interactive and Achieve Questions

Place the steps of glucose oxidation in the correct order.

Citric acid cycle

Glycolysis

Glucose

Pyruvate oxidation

Electron carriers

Glucose

Glycolysis

Pyruvate oxidation

Citric acid cycle

Electron carriers

The oxidation of glucose to water and carbon dioxide is:

exergonic

The reduced coenzymes carry energy to the electron transport chain in the form of electrons and hydrogen ions. Where does the energy to make ATP by oxidative phosphorylation come from?

A) oxygen

B) carbon dioxide

C) The hydrogen ion gradient

D) water

C) The hydrogen ion gradient

Which step in glucose oxidation harvests the most energy?

A) glycolysis

B) pyruvate oxidation

C) Citric acid cycle

C) Citric acid cycle

Match the molecule with it's state (oxidized or reduced)?

FADH2

NADH

NAD+

FAD

FADH2 reduced

NADH reduced

NAD+ oxidized

FAD oxidized

Match the Inputs of Cellular Respiration on the left with the Pathways on the right.

Coenzyme A

Pyruvate Oxidation

Match the Inputs of Cellular Respiration on the left with the Pathways on the right.

FAD

Citric Acid Cycle

Match the Inputs of Cellular Respiration on the left with the Pathways on the right.

NADH

Fermentation

Match the Inputs of Cellular Respiration on the left with the Pathways on the right.

NAD+

Glycolysis, Pyruvate Oxidation, and the Citric Acid Cycle

Match the Inputs of Cellular Respiration on the left with the Pathways on the right.

Pyruvate

Pyruvate Oxidation and Fermentation

Match the Inputs of Cellular Respiration on the left with the Pathways on the right.

ATP

Glycolysis

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

Pyruvate

Glycolysis

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

Acetyl CoA

Pyruvate Oxidation

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

ATP

Glycolysis and the Citric Acid Cycle

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

FADH2

Citric Acid Cycle

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

NADH

Glycolysis, Pyruvate Oxidation, and the Citric Acid Cycle

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

CO2

Pyruvate Oxidation, Fermentation, and the Citric Acid Cycle

Match the Outputs of Cellular Respiration on the left with the Pathways on the right.

NAD+

Fermentation

Match the Pathway on the left with a location on the right.

Fermentation

Cytoplasm/Cytosol

Match the Pathway on the left with a location on the right.

Glycolysis

Cytoplasm/Cytosol

Match the Pathway on the left with a location on the right.

Citric Acid Cycle

Mitochondrial Matrix

Match the Pathway on the left with a location on the right.

Pyruvate Oxidation

Mitochondrial Matrix

What stage of cellular respiration occurs following the production of pyruvate?

pyruvate oxidation

A molecule that is ______ loses electrons, and a molecule that is ____ gains electrons.

oxidized; reduced

Which of the following is one explanation for why glycolysis is believed to have arisen very early in the evolution of life?

A) It produces no CO2

B) It produces only a small amount of ATP

C) It splits glucose into two 3-carbon compounds

D) It does not require oxygen

D) It does not require oxygen

In glycolysis, ATP is synthesized by:

A) oxidative phosphorylation

B) substrate-level phosphorylation

C) both substrate level and oxidative phosphorylation

B) substrate-level phosphorylation

During pyruvate oxidation, pyruvate is broken down into CO2 and an acetyl group. The CO2 is:

A) more reduced than the acetyl group

B) less oxidized than the acetyl group

C) less energetic than the acetyl group

C) less energetic than the acetyl group

A single molecule of glucose requires __ “turn(s)” through the citric acid cycle for its chemical energy to be completely harvested.

2

Oxidative phosphorylation yields _____ ATP for each molecule of FADH₂ that is oxidized, whereas it yields ____ ATP for each molecule of NADH.

1.5; 2.5

A researcher is comparing the amount of protein contained in inner and outer mitochondrial membranes. What do you predict they will find?

A) The amount of proteins will be equivalent in the outer and inner membranes.

B) The amount of proteins will be greater in the inner membrane.

C) The amount of proteins will be greater in the outer membrane

B) The amount of proteins will be greater in the inner membrane.

Starting from glucose, lactic acid fermentation results in molecules of lactic acid, each with ____ carbons, whereas ethanol fermentation results in _____ molecules of ethanol, each with ____ carbons.

2; 3; 2; 2

Red blood cells in the human bloodstream do not have mitochondria. What metabolic process would you predict these cells use to provide cellular energy/ATP?

A) anaerobotic respiration

B) pyruvate oxidation and the citric acid cycle

C) fatty acid digestion

D) ethanol fermentation

E) lactic acid fermentation

E) lactic acid fermentation

We consume a variety of carbohydrates that are digested into a variety of different monosaccharides. How do these different sugars enter glycolysis?

A) Different sugars can be modified to form different intermediates of glycolysis

B) All sugars are converted to glycerald 3-phosphate and enter glycolysis at phase 3, step 6

C) All sugars are converted to glucose 6-phosphate and enter glycolysis at ohase 1, step 2

A) Different sugars can be modified to form different intermediates of glycolysis

You may be familiar with the story of Philippides, the famous Greek runner who ran the first marathon and then died after completing his run. Based on what you know of aerobic respiration and fermentation, why might Philippides have died?

A) His muscles may have produced toxic levels of ethanol, causing his blood to become more acidic.

B) His muscles may have produced toxic levels of lactic acid, causing his blood to become more acidic.

B) His muscles may have produced toxic levels of lactic acid, causing his blood to become more acidic.

The reaction of iron with oxygen to from iron oxide is an example of an oxidation-reduction reaction:

4Fe + 3O₂ —→ 2Fe₂O₃

In this reaction _____ loses electrons and is _______.

A) O₂; oxidized

B) O₂; reduced

C) Fe; reduced

D) FeO₃; reduced

E) Fe; oxidized

E) Fe; oxidized

The reaction of iron with oxygen to from iron oxide is an example of an oxidation-reduction reaction:

4Fe + 3O₂ —→ 2Fe₂O₃

In this reaction _____ gains electrons and is _______.

A) O₂; reduced

B) O₂; oxidized

C) Fe; reduced

D) FeO₃; reduced

E) Fe; oxidized

A) O₂; reduced

The reaction of iron with oxygen to from iron oxide is an example of an oxidation-reduction reaction:

4Fe + 3O₂ —→ 2Fe₂O₃

In this reaction, each iron atom will:

A) gain 3 electrons

B) lose 3 electrons

C) gain 1 ½ electrons

B) lose 3 electrons

Nicotinamide Adenin Dinucleotide is an electron carrier in many important cellular reaction. It exists in an oxidized form (NAD+) and a reduced form (NADH). What is the missing component in the reaction: NAD+ +____ + H+ —→ NADH?

A) heat

B) H2O

C) 4 e-

D) O2
E) 2 e-

E) 2 e-

Consider this reaction: (the picture)

The reactions shown present the overall oxidation-reduction in which elemental iron and molecular oxygen react to form iron oxide (A), and also the half reactions showing the oxidation part and the reduction part (B & C). Compare this reaction and its half reaction to the reaction of Nicotinamide Adenine Dinucleotise as an electron carrier in many important cellular reactions:

NAD+ + 2e- H+ —-→ NADH

WHich reaction or half reaction is most similar to this NAD+/NADH reaction?

Which reaction or half reaction is most similar to this NAD+/NADH reaction?

A) reactions A

B) it combines both reaction B and reaction C

C) reaction B

D) reaction C

D) reaction C