Photosynthesis: photosystem I and photosystem II and their bioinorganic aspects - One Line Questions
1.
What is the typical absorption maximum wavelength for the reaction center chlorophyll of Photosystem I (P700)? —
700 nm
2.
The bioinorganic cluster in PSII that directly receives electrons from P680 is: —
Pheophytin
3.
Which of the following is a primary electron acceptor in Photosystem II? —
Plastoquinone
4.
The bioinorganic aspect of Photosystem II's function involves the manganese cluster's ability to: —
Facilitate the oxidation of water
5.
The splitting of water (photolysis) in Photosystem II requires the presence of: —
Light energy and a manganese cluster
6.
The role of plastocyanin in the photosynthetic electron transport chain is to: —
Carry electrons from the cytochrome b6f complex to PSI
7.
The primary function of the light-harvesting complexes (LHCs) associated with PSI and PSII is to: —
Transfer absorbed light energy to the reaction centers
8.
Which of the following is a key role of copper ions in photosynthetic electron transport? —
Involved in electron transfer in plastocyanin
9.
The bioinorganic cofactor in the reaction center of Photosystem I that is responsible for the initial electron transfer is: —
A special pair of chlorophyll a molecules (P700)
10.
Which pigment molecule is considered the reaction center chlorophyll in Photosystem II? —
P680
11.
Which of the following is a characteristic of the bioinorganic center of Photosystem I's reaction center? —
Involves 4Fe-4S clusters for electron transfer
12.
The electron transport chain between Photosystem II and Photosystem I involves which of the following carriers? —
All of the above
13.
What is the role of accessory pigments (like chlorophyll b and carotenoids) in the photosystems? —
Transfer energy to the reaction center chlorophyll
14.
The bioinorganic center responsible for the oxidation of water in PSII is a tetrameric cluster of: —
Mn-Ca
15.
The overall function of the photosystems and associated electron transport chain is to convert light energy into chemical energy in the form of: —
ATP and NADPH
16.
The 'water splitting' reaction in PSII produces electrons, protons, and: —
Oxygen
17.
Which metal ion is proposed to play a role in stabilizing the structure of chlorophyll antennae complexes? —
Magnesium
18.
The oxygen-evolving complex (OEC) in Photosystem II is primarily associated with which metal ion? —
Manganese
19.
Which element is crucial for the stability and function of the chlorophyll molecules within the photosystems? —
Magnesium
20.
The bioinorganic components of the Fe-S centers in Photosystem I are responsible for: —
Electron transfer
21.
The cytochromes in the cytochrome b6f complex contain heme groups, which are iron-containing porphyrin structures, essential for: —
Electron transfer
22.
Which complex contains the primary electron donor P700 in Photosystem I? —
Reaction center of PSI
23.
Which metal ion is essential for the catalytic activity of the NADP+ reductase enzyme, which receives electrons from PSI? —
Iron
24.
Which metal ion is the central atom in the reaction center of Photosystem I (PSI)? —
Iron (Fe^2+/Fe^3+)
25.
Which metal ion is part of the reaction center chlorophyll (P700) in Photosystem I? —
Magnesium
26.
Cytochrome f, a component of the cytochrome b6f complex, contains a heme group with which metal ion? —
Iron
27.
Which of the following is a key bioinorganic component of the electron transfer pathway in Photosystem I? —
4Fe-4S clusters
28.
The function of cyclic electron flow is primarily to generate: —
ATP
29.
The 'cyclic electron flow' in photosynthesis primarily involves: —
Only Photosystem I
30.
The 'dark reactions' (Calvin cycle) are directly dependent on the products of the light-dependent reactions, which are: —
ATP and NADPH
31.
The reaction center chlorophyll of Photosystem I is designated as: —
P700
32.
In Photosystem I, the primary electron acceptor is a molecule called: —
Pheophytin
33.
The proton gradient generated across the thylakoid membrane by the electron transport chain is used by: —
ATP synthase
34.
In cyclic electron flow, electrons from ferredoxin are returned to: —
The cytochrome b6f complex
35.
The bioinorganic component that acts as a mobile electron carrier between PSII and the cytochrome b6f complex is: —
Plastoquinone
36.
In Photosystem II, the electron lost by P680 is transferred to pheophytin, and then to: —
Plastoquinone
37.
Which of the following is NOT a component of the electron transport chain linking PSII and PSI? —
Ferredoxin
38.
The bioinorganic component that bridges the electron transport between the cytochrome b6f complex and Photosystem I is: —
Plastocyanin
39.
Which molecule directly receives electrons from Photosystem I to reduce NADP+? —
Ferredoxin
40.
The primary role of the oxygen-evolving complex (OEC) is to: —
Catalyze the oxidation of water to O2
41.
The high redox potential of P680+ in Photosystem II is crucial for: —
Oxidizing water
42.
The reduction of P700+ in Photosystem I by plastocyanin occurs in the: —
Thylakoid membrane
43.
The 'Z-scheme' of photosynthesis refers to the energy levels of electrons as they move through: —
The electron transport chain involving PSI and PSII
44.
What is the primary role of Photosystem II (PSII) in photosynthesis? —
To oxidize water and release oxygen
45.
The 'plastoquinone pool' in the thylakoid membrane functions to: —
Transfer electrons from PSII to the cytochrome b6f complex
46.
Which of the following is the terminal electron acceptor in the linear electron flow of photosynthesis? —
NADP+
47.
The primary bioinorganic component that acts as the electron donor to P700 in Photosystem I during cyclic electron flow is: —
Plastocyanin
48.
The P680 reaction center chlorophyll in Photosystem II is oxidized by: —
A tyrosine residue (Z)
49.
In Photosystem II, the electron lost by P680 is ultimately replaced by an electron from: —
Water
50.
The electron flow from Photosystem I directly leads to the reduction of: —
NADP+