Biochemistry Questions and Answers – The Central Photochemical Event : Light-Driven Electron Flow

This set of Biochemistry Questions and Answers for Entrance exams focuses on “The Central Photochemical Event: Light-Driven Electron Flow”.

1. A chlorophyll-like accessory pigment lacking Mg+2 is ____________
a) Pheophytin
b) Cytochrome c
c) Plastocyanin
d) Ferredoxin
View Answer

Answer: a
Explanation: Pheophytin is a chlorophyll-like accessory pigment lacking Mg+2.

2. A soluble Cu-containing electron transfer protein is ____________
a) Pheophytin
b) Cytochrome c
c) Plastocyanin
d) Ferredoxin
View Answer

Answer: c
Explanation: Plastocyanin is a soluble Cu-containing electron transfer protein.

3. Photosystem II is a ____________
a) Pheophytin-quinone type
b) Ferredoxin type
c) Plastocyanin type
d) Plastocyanin-ferredoxin type
View Answer

Answer: a
Explanation: Photosystem II is a pheophytin-quinone type of system.
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4. Which of the following describes the complete route by which electrons flow H2O to NADP+?
a) Z scheme
b) A scheme
c) B scheme
d) X scheme
View Answer

Answer: a
Explanation: Z scheme describes the complete route by which electrons flow H2O to NADP+.

5. Plastoquinol formed in PSII is oxidized by ____________
a) Cytochrome b6f
b) Cytochrome c
c) Cytochrome f
d) Cytochrome h
View Answer

Answer: a
Explanation: Plastoquinol formed in PSII is oxidized by cytochrome b6f complex.
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6. A mobile, lipid soluble carrier of two electrons present in chloroplasts is ____________
a) PQB
b) Q
c) Cytochrome c
d) Plastocyanin
View Answer

Answer: a
Explanation: Q is present in mitochondria; cytochrome c and plastocyanin are water-soluble protein that carries one electron.

7. A mobile, lipid soluble carrier of two electrons present in mitochondria is ____________
a) PQB
b) Q
c) Cytochrome c
d) Plastocyanin
View Answer

Answer: b
Explanation: PQB is present in chloroplasts; cytochrome c and plastocyanin are water-soluble protein that carries one electron.
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8. A water-soluble protein that carries one electron present in mitochondria is ____________
a) PQB
b) Q
c) Cytochrome c
d) Plastocyanin
View Answer

Answer: c
Explanation: PQB and Q are lipid-soluble protein; plastocyanin is present in chloroplast.

9. A water-soluble protein that carries one electron present in the chloroplast is ____________
a) PQB
b) Q
c) Cytochrome c
d) Plastocyanin
View Answer

Answer: d
Explanation: PQB and Q are lipid-soluble protein; cytochrome c is present in mitochondria.
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10. Cyanobacteria does not use which of the following for both oxidative and photophosphorylation?
a) Cytochrome c6
b) Cytochrome b6f
c) Plastoquinone
d) Plastocyanin
View Answer

Answer: d
Explanation: Cyanobacteria use cytochrome c6, cytochrome b6f and plastoquinone for both oxidative and photophosphorylation.

Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry for Entrance exams, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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