Bioenergy

Question 1

Which of the following is the correct sequence of electron acceptors in ETS for production of ATP?

(a) Cyt b, c, a, a3

(b) Cyt a, a, b, c

(c) Cyt c, b, a, a3

(d) Cyt b, c, a3, a

Answer 1

a

Question 2

Which of the following terminal cytochromes is responsible for donating electrons to oxygen?

(a) Cyt a3

(b) Cyt b

(c) Cyt c

(d) Cyt a1

Answer 2

a

Question 4

Electron transport system (ETS) is present in which of the following parts of mitochondria?

(a) Inner membrane

(b) Outer membrane

(c) Matrix

(d) Stroma

Answer 4

a

Question 5

Which of the following is the first complex (Complex I) of ETS?

(a) NADH dehydrogenase

(b) Cytochrome aa3

(c) Cytochrome bc1

(d) ATP synthase

Answer 5

c

Question 6

Ubiquinone transfers its electrons to

(a) Complex I

(b) Complex II

(c) matrix

(d) Cyt c

Answer 6

d

Question 7

In which part of the cell, oxidative phosphorylation takes place?

(a) Inner mitochondrial membrane

(b) Outer mitochondrial membrane

(c) Grana of chloroplast

(d) Stroma of chloroplast

Answer 7

a

Question 8

Cytochromes are present in

(a) lysosomes

(b) mitochondrial matrix

(c) cristae of mitochondria

(d) outer membrane of mitochondria

Answer 8

c
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Question 9

ATP synthesis by ATP synthase is driven by the movement of

(a) protons

(b) NADH

(c) electrons

(d) All of the above

Answer 9

a
protons H+

Question 10

Oxidative phosphorylation results in the formation of

(a) Oxygen

(b) ADP

(c) ATP + H2O

(d) NADH

Answer 10

c

Question 11

Which of the following complexes of ETS does not account for the pumping out of protons from the mitochondrial matrix?

(a) Complex I

(b) Complex III

(c) Complex II

(d) Complex IV

Answer 11

c
succinate-coQ reductase

Question 12

Which of the following is the Complex IV of ETS?

(a) NADH dehydrogenase

(b) Cytochrome c oxidase

(c) Cytochrome bc1

(d) Succinate dehydrogenase

Answer 12

b
cytc aa3

Question 13

Which of the following is the Complex II of ETS?

(a) NADH dehydrogenase

(b) Succinate dehydrogenase

(c) Cytochrome bc1

(d) ATP synthase

Answer 13

b
Succinate dehydrogenase (SDH) or succinate-coenzyme Q reductase (SQR) or respiratory complex II

Question 14

Which of the following products of glucose oxidation are necessary for oxidative phosphorylation?

(a) Pyruvate

(b) NADH and FADH2

(c) Acetyl CoA

(d) NADPH and ATP

Answer 14

b

Question 15

Which of the following is true for cytochrome c oxidase complex?

(a) It donates electrons to O2

(b) It accepts electrons from Cyt c

(c) It pumps two protons out of the mitochondrial matrix

(d) All of the above

Answer 15

d