Ubiquinone

Q. Match the following:

Column I	Column I
A. Complex I	I. Cytochrome c oxidase
B. Complex II	II. Cytochrome bc1 complex
C. Complex III	III. NADH dehydrogenase
D. Complex IV	IV. FADH2

1. A-III, B-IV, C-II, D-I
2. A-III, B-II, C-I, D-IV
3. A-II, B-IV, C-III, D-I
4. A-II, B-III, C-I, D-IV

Q.

What types of molecules break down to make ATP?

Q.

How many electrons can FAD carry?

Q.

Is NADH an electron carrier?

Q.

During respiration, NADH donates two electrons to the carrier know as ubiquinone. When this happens, ubiquinone:

1. passes the electrons directly to O2 which is reduced to water

2. pumps protons across the inner mitochondrial membrane

3. all of the above

4. becomes oxidized

Q.

Is FADH₂ an electron carrier?

Q. Which of the following components of the ETC are electron carriers

1. Complex I
2. Ubiquinone
3. Cytochrome C
4. Compex III

Q. the electron flow from complex I to complex III is through

1. Cytochrome
2. Ubiquinone
3. Complex IV
4. Complex II

Q.

Q. When potassium cynide is added...

a). In plants, the ETS gets blocked but plant do not die.

b). But if in animal, it get dies.

What is reason for this..?

Q. Which of the following components of the ETC are electron carriers

1. Complex I
2. Ubiquinone
3. Cytochrome C
4. Compex III

Q. When the both pigment systems are involved simultaneously in electron transport system then path of electron become Z−shape. This shape is due to :-

1. First electron acceptor is quinone
2. Chlorophyll − a is universal pigment
3. Spiting of water
4. Electron carriers are placed in order of redox potential

Q. Most abundant enzyme is

1. Rubisco
2. Catalase
3. Invertase
4. Nitrogenase

Q. In ETS, terminal electron acceptor is

1. H${}_2$
2. Cytochrome
3. O${}_2$
   
   
4. H${}_2$O

Q.

During respiration, NADH donates two electrons to the carrier know as ubiquinone. When this happens, ubiquinone:

1. becomes oxidized

2. passes the electrons directly to O2 which is reduced to water

3. pumps protons across the inner mitochondrial membrane

4. all of the above

Q. the electron flow from complex I to complex III is through

1. Cytochrome
2. Ubiquinone
3. Complex II
4. Complex IV

Q. Find out the correct combinations concerning components of photosynthetic electron transport, location in relation to thylakoid and action.
I. OEC - Iumen side - water reduction.
II. Plastocyanin - lumen side - electron transfer from cyt f to PSI.
III. Ferrodoxin - stroma side - reduction of $NA{D}^{+}$ to $NADH$.
IV. Cytochrome complex - integral protein - transfer electrons from $PQ{H}_2$ to PC.
Choose the correct answer.

1. II and IV
2. I and IV.
3. I and III
4. II and III

Q. Electron vacancy in PSI in ETS is replaced by

1. PSII
2. Plastocyanin
3. Photolysis of water
4. None of these

Q. Oxidative phosphorylation is the formation of

1. NADPH${}_2$ in respiration
2. ATP in respiration
3. NADPH${}_2$ in photosynthesis
4. ATP in photosynthesis

Q. The following is a scheme showing the electron transport system. Identify the electron carrier molecules indicated as A and B. Choose the correct option.

1. A$=$coenzyme Q, B$=$cytochrome c
2. A$=$cytochrome Q, B$=$coenzyme Q
3. A$=$Fe-S protein , B$=$FMN
4. A$=$FMN, B$=$Fe-S protein

Q.

Explain ETS.

Q. ETC of photosynthesis process is

1. Bound to thylakoid membrane
2. Present in stroma
3. Bound to outer chloroplast membrane
4. Dispersed in cytosol

Q. the electron flow from complex I to complex III is through

1. Cytochrome
2. Ubiquinone
3. Complex II
4. Complex IV