Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Oxidative Phosphorylation Test Ban UPDATED, Exams of Nursing

Chamberlain College of NursingNursing

Oxidative Phosphorylation Test Ban UPDATED

Typology: Exams

2025/2026

Available from 05/22/2026

nurse-polly
nurse-polly ๐Ÿ‡บ๐Ÿ‡ธ

342 documents

1 / 6

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
OXIDATIVE PHOSPHORYLATION TEST BAN
UPDATED WITH QUESTIONS AND ANSWERS
In the initial step of Complex I, two high-potential electrons are transferred from NADH to the
___________ prosthetic group of this complex. - ANSWERSflavin mononucleotide (FMN)
Cytochrome ________ is the only water-soluble cytochrome of the electron-transport chain. -
ANSWERSc
________________ carries electrons from Complex III to Complex IV. - ANSWERSCytochrome c
________________ is a poison because it blocks the flow of electrons from cytochrome c to oxygen. -
ANSWERSCyanide
What type of gradient is critical to ATP formation by oxidative phosphorylation?
A) sodium ion
B) chloride ion
C) proton
D) potassium ion
E) None of the above. - ANSWERSC) proton
Choose the correct path taken by a pair of electrons as they travel down the electron-transport chain.
A) NADH โ†’ Complex I โ†’ CoQ โ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O2
B) FADH2 โ†’ Complex I โ†’ CoQ โ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O2
C) NADH โ†’ Complex I โ†’ Complex IIโ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O2
D) FADH2 โ†’ Complex II โ†’ CoQ โ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O2
E) A and D. - ANSWERSE) A and D.
Which of the following does NOT participate in, nor is a component of, the electron-transport chain?
pf3
pf4
pf5

Partial preview of the text

Download Oxidative Phosphorylation Test Ban UPDATED and more Exams Nursing in PDF only on Docsity!

OXIDATIVE PHOSPHORYLATION TEST BAN

UPDATED WITH QUESTIONS AND ANSWERS

In the initial step of Complex I, two high-potential electrons are transferred from NADH to the ___________ prosthetic group of this complex. - ANSWERSflavin mononucleotide (FMN) Cytochrome ________ is the only water-soluble cytochrome of the electron-transport chain. - ANSWERSc ________________ carries electrons from Complex III to Complex IV. - ANSWERSCytochrome c ________________ is a poison because it blocks the flow of electrons from cytochrome c to oxygen. - ANSWERSCyanide What type of gradient is critical to ATP formation by oxidative phosphorylation? A) sodium ion B) chloride ion C) proton D) potassium ion E) None of the above. - ANSWERSC) proton Choose the correct path taken by a pair of electrons as they travel down the electron-transport chain. A) NADH โ†’ Complex I โ†’ CoQ โ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O B) FADH2 โ†’ Complex I โ†’ CoQ โ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O C) NADH โ†’ Complex I โ†’ Complex IIโ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O D) FADH2 โ†’ Complex II โ†’ CoQ โ†’ Complex III โ†’ Cyt c โ†’ Complex IV โ†’ O E) A and D. - ANSWERSE) A and D. Which of the following does NOT participate in, nor is a component of, the electron-transport chain?

A) lipoic acid B) nonheme, iron-sulfur proteins C) FADH D) cytochrome c E) NADH - ANSWERSA) lipoic acid In prokaryotes the site of ATP-synthesizing machinery is A) the mitochondrial matrix. B) the outer cell wall. C) the cytoplasmic membrane. D) the nucleolus. E) none of the above. - ANSWERSC) the cytoplasmic membrane. Electron flow down the electron-transport chain leads to the: A) the transport of protons across the inner mitochondrial membrane from inside the matrix to the intermembrane space B) the transport of protons across the inner mitochondrial membrane from the intermembrane space into the matrix C) the coupled synthesis of GTP D) a dangerous imbalance of K+ ions across the mitochondrial membrane E) none of the above - ANSWERSA) the transport of protons across the inner mitochondrial membrane from inside the matrix to the intermembrane space Coenzyme Q is also called: A) NADH. B) oxidoreductase. C) ubiquinone. D) All of the above. E) None of the above. - ANSWERSC) ubiquinone.

Provide a brief description of oxidative phosphorylation. - ANSWERSIt is the process in which ATP is formed, due to the transfer of electrons from NADH or FADH2 to O2 by a series of electron carriers in the inner membrane of the mitochondria. Describe the path by which electrons from FADH2 enter the electron transport chain - ANSWERSSuccinate dehydrogenase, which forms FADH2, is part of the succinate-Q reductase complex. The FADH2 does not leave this complex, but transfers electrons to the ironsulfur centers of the complex, and then to Q. Explain why less ATP is made from the reoxidation of FADH2 as compared to NADH. - ANSWERSComplex II is not a proton pump. When electrons flow from FADH2 to oxygen, as catalyzed by complex II, complex III, and complex IV, fewer protons are pumped out of the matrix as compared to NADH. Thus, fewer ATP molecules are ultimately made. Give the balanced equation for the net reaction catalyzed by Q-cytochrome c oxido-reductase. - ANSWERSQH2 + 2Cyt cox + 2H+matrix โ†’ Q + 2Cyt cred + 4H+cytosol How is oxidative phosphorylation regulated? - ANSWERSThe electrons do not flow unless ADP is available to be simultaneously phosphorylated to ATP. Thus, the synthesis of ATP does not occur unless ADP levels are high. This is referred to as acceptor control. Explain why carbon monoxide is toxic. - ANSWERSCarbon monoxide bond to the ferrous ion of cytochrome a3 of cytochrome c oxidase.This blocks the electron flow to oxygen and the proton-motive force can no longer be generated. Without the proton gradient, the phosphorylation of ADP cannot occur. Thus, energy production ceases. Draw a scheme for showing the respiratory electron transport chain - ANSWERSElectrons are transferred between Complexes I and III by the membrane-soluble coenzyme Q and between Complexes III and IV by the peripheral membrane protein cytochrome c. Complex II (not shown transfers electrons from succinate to Coenzyme Q) What is the direction of the spontaneous electron transport? Consider the E0' values for each redox system in the respiratory electron transport chain, - ANSWERSFrom the more negative e0 to the more positive e

Electrons Flow Spontaneously from the Reduced form of Substance with lower reduction potential to the Oxidized form of the Substance with the higher reduction potential Describe briefly the 4 enzyme complexes (Describe also the differences between the enzyme complexes vs. Cyt c and Q?) - ANSWERSComplex I (NADH-ubiquinone oxidoreductase): catalyzes oxidation of NADH by Q: NADH + Q (oxidized) โž” NAD+ + QH2 (reduced) Complex II (Succinate-ubiquinone reductase): Accepts electrons from FADH (via succinate), passes them to Q. It does not pump protons. Complex III (Ubiquinol-cytochrome c reductase): catalyzes oxidation of QH2 (reduced) by cytochome c: QH2(red) + 2 Cytochome c (oxidized) โž” Q (oxidized) + 2 Cytochome c (reduced) Complex IV (Cytochrome c oxidase): catalyzes oxidation of Cytochrome c (reduced) by O2: (The terminal electron acceptor of the electron transport process) 2 Cytochrome c (reduced) + ยฝ O2 โž” 2 Cytochrome c (oxidized) + H2O Enzyme Complexes (I, II, III, IV)

  • Mobility: Stationary (embedded in inner membrane)
  • Structure: Large multi-subunit protein complexes
  • Function: Redox reactions, proton pumping (H+)
  • Proton Pumping: Yes (I, III, IV pump)
  • Location: Integral to inner mitochondrial membrane Mobile Carriers (Q and Cyt c)
  • Mobility: Mobile (free to move in membrane/space)
  • Structure: Small molecules (Q) or small protein (Cyt c)
  • Function: Transfer electrons between complexes
  • Proton Pumping: No