🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Biology
6
answers
0
watching
36
views
28 Nov 2019

In the electron transport chain, what happens if the electron transfer between Coenzyme Q and complex III is blocked?

A. Oxygen is consumed

B. Complex I is oxidized

C. Coenzyme Q is oxidized

D. Cytochrome c is oxidized

Watch
6
answers
0
watching
36
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Get unlimited access
Already have an account? Log in
Share
Get unlimited access
Already have an account? Log in
Share
Get unlimited access
Already have an account? Log in
Share
Get unlimited access
Already have an account? Log in
Share
Get unlimited access
Already have an account? Log in
Share
Jarrod Robel
Jarrod RobelLv2
24 Mar 2019
Get unlimited access
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

15. The prosthetic group of NADH dehydrogenase:

A. FMN

B. NADH

C. FAD

D. NADPH

E. Iron

16. What type of reactions form the basis of the electron transport chain and what is the final electron acceptor?

A. Acid-base reactions; O2

B. Acid-base reactions; water

C. Oxidation-reduction reactions; water

D. Oxidation-reduction reactions; NADH

E. Oxidation-reduction reactions; O2

17. Which shows the proper order of electron transfer for the listed electron transport chain components (not all electron carriers are shown)?

A. NADH → → Q → → cytochrome c → → O2

B. O2 → → cytochrome c → → Q → → NADH

C. NADH → → cytochrome c → → Q → → O2

D. Q → → NADH → → cytochrome c → → O2

E. NADH → → O2 → → cytochrome c → → Q

18. Which complex oxidize NADH and FADH2 respectively in the electron transport chain

A. Complex I, Complex I

B. Complex I, Complex II

C. Complex II, Complex III

D. Complex II, Complex I

E. Complex II, Complex IV

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.

If a small molecule inhibitor of complex I were toblock the transfer of electrons from the Fe-S chain in complex I to coenzyme Q predict the following (assume oxygen is in ample supply):

a. Redox state (you can simply state “oxidized” or “reduced”) of:

i. FMN

ii. Complex II Fe-S centers

iii. Cyt c1

iv. Cub

b. Flux through the citric acid cycle (you can simply state “increased” or “decreased”).

c. Explain the rationale for your answer to “ii.” (redox state of complex II Fe-S centers) and “b.” (Flux of the citric acid cycle)

Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in