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Cyclic and Noncyclic Phosphorylation MDCAT MCQs with Answers

Cyclic and Noncyclic Phosphorylation MCQs

Welcome to the Cyclic and Noncyclic Phosphorylation MDCAT MCQs with Answers. In this post, we have shared Cyclic and Noncyclic Phosphorylation Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Cyclic and Noncyclic Phosphorylation MCQs in this MDCAT Online Test.

What is the primary difference between cyclic and noncyclic phosphorylation?
a) Cyclic phosphorylation produces oxygen; noncyclic does not
b) Noncyclic phosphorylation produces NADPH; cyclic does not
c) Cyclic phosphorylation produces glucose; noncyclic does not
d) Noncyclic phosphorylation only occurs in the dark

Answer
b) Noncyclic phosphorylation produces NADPH; cyclic does not

Which process is involved in cyclic phosphorylation?
a) Light-dependent reactions
b) Calvin cycle
c) Krebs cycle
d) Glycolysis

Answer
a) Light-dependent reactions

In cyclic phosphorylation, where does the electron transport chain occur?
a) Thylakoid membrane
b) Chloroplast stroma
c) Mitochondrial matrix
d) Outer membrane of the chloroplast

Answer
a) Thylakoid membrane

What is the primary product of cyclic phosphorylation?
a) NADPH
b) ATP
c) Glucose
d) Oxygen

Answer
b) ATP

Which type of phosphorylation generates NADPH?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

In noncyclic phosphorylation, what is the source of electrons?
a) NADH
b) FADH2
c) Water
d) Glucose

Answer
c) Water

Which enzyme is involved in both cyclic and noncyclic phosphorylation?
a) RuBisCO
b) ATP synthase
c) NADP+ reductase
d) Carbonic anhydrase

Answer
b) ATP synthase

Which of the following processes generates oxygen as a byproduct?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

In cyclic phosphorylation, what happens to the electrons after they pass through the electron transport chain?
a) They are transferred to NADP+
b) They are transferred back to chlorophyll
c) They are used to split water molecules
d) They are used to produce glucose

Answer
b) They are transferred back to chlorophyll

Which type of phosphorylation is responsible for producing NADPH?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

What is the role of water in noncyclic phosphorylation?
a) To provide electrons to the electron transport chain
b) To absorb light energy
c) To produce ATP
d) To release NADPH

Answer
a) To provide electrons to the electron transport chain

Which molecule is regenerated in cyclic phosphorylation?
a) NADPH
b) ATP
c) Chlorophyll
d) Glucose

Answer
c) Chlorophyll

Which of the following is a product of noncyclic phosphorylation but not cyclic phosphorylation?
a) ATP
b) Oxygen
c) NADPH
d) Carbon dioxide

Answer
b) Oxygen

What is the main purpose of cyclic phosphorylation in plants?
a) To produce NADPH
b) To produce ATP
c) To fix carbon dioxide
d) To split water molecules

Answer
b) To produce ATP

What happens to ATP produced in cyclic phosphorylation?
a) It is used in the Calvin cycle
b) It is converted to NADPH
c) It is stored in the thylakoid membrane
d) It is used to release oxygen

Answer
a) It is used in the Calvin cycle

Which process involves the transfer of electrons through a chain of proteins in the thylakoid membrane?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

How does cyclic phosphorylation affect the production of ATP?
a) It decreases ATP production
b) It increases ATP production
c) It has no effect on ATP production
d) It stops ATP production

Answer
b) It increases ATP production

What is the ultimate source of electrons for noncyclic phosphorylation?
a) Water
b) NADH
c) FADH2
d) Glucose

Answer
a) Water

Which component of the photosynthetic electron transport chain is involved in cyclic phosphorylation?
a) Photosystem I
b) Photosystem II
c) ATP synthase
d) NADP+ reductase

Answer
a) Photosystem I

What is the role of ATP synthase in photosynthesis?
a) To transfer electrons
b) To convert ATP to NADPH
c) To synthesize ATP from ADP and inorganic phosphate
d) To split water molecules

Answer
c) To synthesize ATP from ADP and inorganic phosphate

Which process does not involve the production of NADPH?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
a) Cyclic phosphorylation

In which process does chlorophyll absorb light energy to initiate electron transport?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

What is the effect of cyclic phosphorylation on the Calvin cycle?
a) It provides NADPH for the Calvin cycle
b) It produces ATP for the Calvin cycle
c) It provides oxygen for the Calvin cycle
d) It has no effect on the Calvin cycle

Answer
b) It produces ATP for the Calvin cycle

Which molecule is used to provide electrons to the electron transport chain in noncyclic phosphorylation?
a) NADH
b) FADH2
c) Water
d) Glucose

Answer
c) Water

In cyclic phosphorylation, how is the electron transport chain completed?
a) Electrons are transferred to NADP+
b) Electrons are transferred to water
c) Electrons are returned to chlorophyll
d) Electrons are used to produce glucose

Answer
c) Electrons are returned to chlorophyll

Which process generates both ATP and NADPH?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

What is the role of photosystem II in noncyclic phosphorylation?
a) To produce ATP
b) To absorb light and split water molecules
c) To reduce NADP+
d) To return electrons to chlorophyll

Answer
b) To absorb light and split water molecules

Which type of phosphorylation is primarily used in photosynthetic organisms to produce ATP in excess?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
a) Cyclic phosphorylation

What is the fate of electrons in noncyclic phosphorylation after they pass through the electron transport chain?
a) They are used to split water
b) They are used to produce ATP
c) They are transferred to NADP+ to form NADPH
d) They are returned to chlorophyll

Answer
c) They are transferred to NADP+ to form NADPH

Which process is characterized by the production of only ATP and not NADPH?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
a) Cyclic phosphorylation

What is the role of plastoquinone in photosynthesis?
a) To absorb light
b) To transfer electrons from photosystem II to the electron transport chain
c) To produce NADPH
d) To synthesize ATP

Answer
b) To transfer electrons from photosystem II to the electron transport chain

Which process involves the cyclic flow of electrons through photosystem I?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
a) Cyclic phosphorylation

What happens to the NADP+ during noncyclic phosphorylation?
a) It is converted to NADPH
b) It is returned to chlorophyll
c) It is used to produce ATP
d) It is split into NADH and phosphate

Answer
a) It is converted to NADPH

Which process is associated with the production of ATP and NADPH in equal amounts?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
b) Noncyclic phosphorylation

What is the main function of cyclic phosphorylation in the light-dependent reactions?
a) To generate NADPH
b) To create a proton gradient for ATP production
c) To produce glucose
d) To release oxygen

Answer
b) To create a proton gradient for ATP production

In noncyclic phosphorylation, what is the source of protons for ATP synthesis?
a) Water
b) NADPH
c) Oxygen
d) Glucose

Answer
a) Water

Which process requires light to produce ATP?
a) Cyclic phosphorylation
b) Noncyclic phosphorylation
c) Both cyclic and noncyclic phosphorylation
d) Neither cyclic nor noncyclic phosphorylation

Answer
c) Both cyclic and noncyclic phosphorylation

Which of the following occurs in cyclic but not noncyclic phosphorylation?
a) Production of ATP
b) Production of NADPH
c) Splitting of water molecules
d) Production of oxygen

Answer
a) Production of ATP

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