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Answer all the question

1. Electrons like to move it, move it!

a. What do we call reactions that transfer electrons between reactants?

b. What does it mean when a substance is oxidized? What does it mean when a substance is reduced? How are oxidation and reduction related?

c. What are the two electron carriers found in the process of cellular respiration?

d. Ultimately, where do the electron carriers bring electrons to? What is the purpose of moving these electrons?

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25 Feb 2018
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Related questions

Can you answer the following questions:

1. Carbon monoxide is considered toxic because it acts on Complex IV. How would the addition of carbon monoxide to actively respiring mitochondria affect the relative oxidation-reduction states of all components of the electron-transport chain?

A) All four complexes would remain oxidized because they function as a multisystem complex.

B) Complexes I and III would be reduced, but complexes II and IV would be oxidized because the

electrons come from FADH2 oxidation, not NADH.

C) Complexes I, II, and III would be oxidized but Complex IV would remain reduced.

D) Complexes I, II, and III would be reduced and Complex IV would be oxidized.

E) All four complexes would remain reduced because they function as a multisystem complex.

2. Electrons are not very soluble in hydrophobic environments such as a bilipid membrane. What evidence is there that electrons move from complex to complex through the lipid membrane?

A) Cytochrome C is the electron carrier in the membrane and undergoes a head-over-heel flip to set up the proton gradient.

B) Cytochrome C is the electron carrier in the membrane and contains a cydrophoric porphyrin center.

C) CoQ is the electron carrier within the membrane and seems to be confined to the respirasome.

D) CoQ is the electron carrier within the membrane and it contains a hydrophobic porphyrin center.

E) FeS clusters are the carriers within the membrane and the electrons move from one cluster to the

next in a chain-like fashion.

3. What is the rationale for saying that “electrons flow down the electron-transport chain”?

A) Electrons flow from oxidized carriers to reduced carriers in discrete steps like a staircase.

B) Electrons flow from half-reactions with more positive redox potentials to more negative.

C) Electrons flow from reactions that continuously generate negative free energy values.

D) Electrons flow from the outer surface to the inner surface, a top down perception.

E) Because we think of electrons flowing like a liquid, the only direction electrons can flow is down.

25. What are the three main stages in cellular respiration, and where in the cell to they occur? 26. Fill in the following chart:

Glycolysis

Krebs cycle

Electron Transport Chain

Purpose

Location

Reactants

Products

27. What is the purpose of NADH and FADH2? To where do they bring electrons?

28. What stages of cellular respiration produce carbon dioxide? Where does this carbon dioxide go?

Question 1

Which of the following statements regarding photosynthesis and cellular respiration is true?

A.

Photosynthesis occurs in mitochondria, and cellular respiration occurs in chloroplasts.

B.

Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria.

C.

Photosynthesis occurs in mitochondria and in chloroplasts.

Question 2

How do cells capture the energy released by cellular respiration?

A.

They produce glucose

B.

The energy is coupled to oxygen

C.

They produce ATP

Question 3

During redox reactions

A.

the loss of electrons from one molecule is called reduction

B.

electrons are lost from one substance and added to another substance

C.

protons from one molecule replace the electrons lost from another molecule

Question 4

Oxidation is the ________, and reduction is the ________.

A.

gain of oxygen; loss of oxygen

B.

loss of electrons; gain of electrons

C.

gain of protons; loss of protons

Question 5

During cellular respiration, NADH

A.

delivers its electron load to the first electron carrier molecule.

B.

is chemically converted into ATP

C.

is the final electron acceptor

Question 6

A drug is tested in the laboratory and is found to create holes in both mitochondrial membranes. Scientists suspect that the drug will be harmful to human cells because it will inhibit

A.

the citric acid cycle only.

B.

glycolysis only

C.

the citric acid cycle and oxidative phosphorylation

Question 7

Which of the following metabolic pathways is common in aerobic and anaerobic metabolism?

A.

glycolysis

B.

the citric acid cycle

C.

electron transport chain

Question 8

Which of the following is a result of glycolysis?

A.

production of CO2

B.

a net loss of two ATPs per glucose molecule

C.

conversion of glucose to two three-carbon compounds

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