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Which of the following is correct in reference to ferredoxin Fe2S2?
(I) In chloroplasts, Fe2S2 ferredoxins function as electron carriers in the photosynthetic electron transport chain
(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated
(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conserved cysteine (Cys) residues.
(I) In chloroplasts, Fe2S2 ferredoxins function as electron carriers in the photosynthetic electron transport chain
(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated
(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conserved cysteine (Cys) residues.
- a)I, II
- b)I, II, III
- c)II, III
- d)I, III
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is correct in reference to ferredoxin Fe2S2?(I)...
Answer:
Introduction:
Ferredoxins are small iron-sulfur proteins that play a crucial role in various biological processes. In this question, we are specifically referring to Fe2S2 ferredoxins and their characteristics.
I) Function of Fe2S2 ferredoxins in chloroplasts:
- Fe2S2 ferredoxins function as electron carriers in the photosynthetic electron transport chain.
- During photosynthesis, ferredoxins receive electrons from Photosystem I and transfer them to other components of the electron transport chain.
- This electron transfer is essential for the production of ATP and NADPH, which are energy-rich molecules used in the synthesis of glucose.
II) Structure of Fe2S2 ferredoxins:
- Fe2S2 ferredoxins are proteins consisting of approximately one hundred amino acids.
- These proteins contain four conserved cysteine residues, which are amino acids with a sulfur-containing side chain.
- The 2Fe-2S cluster is ligated to these four conserved cysteine residues, providing stability and functionality to the ferredoxin molecule.
- The 2Fe-2S cluster consists of two iron atoms tetrahedrally coordinated by inorganic sulfur atoms and the sulfurs of the four conserved cysteine residues. This coordination is crucial for the electron transfer capability of ferredoxins.
III) Coordination of iron atoms:
- The iron atoms in the 2Fe-2S cluster of Fe2S2 ferredoxins are tetrahedrally coordinated.
- They are coordinated by inorganic sulfur atoms (sulfur atoms not associated with cysteine residues) as well as the sulfurs of the four conserved cysteine residues present in the protein.
- This coordination allows the iron atoms to be properly positioned for efficient electron transfer within the ferredoxin molecule.
Conclusion:
Based on the above explanations, it is clear that all three statements (I, II, III) are correct in reference to Fe2S2 ferredoxins. Therefore, the correct option is (b) I, II, III.
Introduction:
Ferredoxins are small iron-sulfur proteins that play a crucial role in various biological processes. In this question, we are specifically referring to Fe2S2 ferredoxins and their characteristics.
I) Function of Fe2S2 ferredoxins in chloroplasts:
- Fe2S2 ferredoxins function as electron carriers in the photosynthetic electron transport chain.
- During photosynthesis, ferredoxins receive electrons from Photosystem I and transfer them to other components of the electron transport chain.
- This electron transfer is essential for the production of ATP and NADPH, which are energy-rich molecules used in the synthesis of glucose.
II) Structure of Fe2S2 ferredoxins:
- Fe2S2 ferredoxins are proteins consisting of approximately one hundred amino acids.
- These proteins contain four conserved cysteine residues, which are amino acids with a sulfur-containing side chain.
- The 2Fe-2S cluster is ligated to these four conserved cysteine residues, providing stability and functionality to the ferredoxin molecule.
- The 2Fe-2S cluster consists of two iron atoms tetrahedrally coordinated by inorganic sulfur atoms and the sulfurs of the four conserved cysteine residues. This coordination is crucial for the electron transfer capability of ferredoxins.
III) Coordination of iron atoms:
- The iron atoms in the 2Fe-2S cluster of Fe2S2 ferredoxins are tetrahedrally coordinated.
- They are coordinated by inorganic sulfur atoms (sulfur atoms not associated with cysteine residues) as well as the sulfurs of the four conserved cysteine residues present in the protein.
- This coordination allows the iron atoms to be properly positioned for efficient electron transfer within the ferredoxin molecule.
Conclusion:
Based on the above explanations, it is clear that all three statements (I, II, III) are correct in reference to Fe2S2 ferredoxins. Therefore, the correct option is (b) I, II, III.
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Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer?
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Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer?.
Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct in reference to ferredoxin Fe2S2?(I) In chloroplasts, Fe2S2ferredoxins function as electron carriers in thephotosynthetic electron transport chain(II) They are proteins of around one hundred amino acids with four conserved cysteine residues to which the 2Fe-2S cluster is ligated(III) The iron atoms are tetrahedrally coordinated both by inorganic sulfur atoms and by sulfurs of four conservedcysteine(Cys) residues.a)I, IIb)I, II, IIIc)II, IIId)I, IIICorrect answer is option 'B'. Can you explain this answer?.
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