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Which of the statements given above is/are correct regarding the structure and function of actin filaments?
i. Each actin filament is composed of two helically wound 'F' (filamentous) actins.
ii. 'G' (Globular) actins are monomers that polymerize to form 'F' actins.
iii. Tropomyosin runs parallel to the 'F' actins and does not interact with them.
iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.
- a)i and ii
- b)ii and iv
- c)i, ii and iv
- d)i, ii and iii
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which of the statements given above is/are correct regarding the struc...
Understanding Actin Filaments
Actin filaments are crucial components of the cytoskeleton in eukaryotic cells, playing vital roles in muscle contraction, cell shape, and motility. Let's analyze the statements regarding their structure and function.
Statement Analysis
- i. Each actin filament is composed of two helically wound F (filamentous) actins.
This statement is correct. Actin filaments, or F-actin, are formed by the polymerization of G-actin monomers into long, helical structures.
- ii. G (Globular) actins are monomers that polymerize to form F actins.
This statement is also correct. G-actin monomers assemble to create F-actin, highlighting the dynamic nature of actin filaments.
- iii. Tropomyosin runs parallel to the F actins and does not interact with them.
This statement is incorrect. Tropomyosin binds to F-actin and stabilizes it, playing a significant role in muscle contraction and regulation of myosin binding sites.
- iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.
This statement is correct. Troponin interacts with tropomyosin and, in the presence of calcium ions, regulates the exposure of binding sites for myosin, which is essential for muscle contraction.
Conclusion
Given the analysis, the correct statements are ii and iv. Therefore, the correct answer is option 'C' (i, ii, and iv). Understanding these components is crucial for comprehending the mechanisms of muscle contraction and cellular movement.
Actin filaments are crucial components of the cytoskeleton in eukaryotic cells, playing vital roles in muscle contraction, cell shape, and motility. Let's analyze the statements regarding their structure and function.
Statement Analysis
- i. Each actin filament is composed of two helically wound F (filamentous) actins.
This statement is correct. Actin filaments, or F-actin, are formed by the polymerization of G-actin monomers into long, helical structures.
- ii. G (Globular) actins are monomers that polymerize to form F actins.
This statement is also correct. G-actin monomers assemble to create F-actin, highlighting the dynamic nature of actin filaments.
- iii. Tropomyosin runs parallel to the F actins and does not interact with them.
This statement is incorrect. Tropomyosin binds to F-actin and stabilizes it, playing a significant role in muscle contraction and regulation of myosin binding sites.
- iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.
This statement is correct. Troponin interacts with tropomyosin and, in the presence of calcium ions, regulates the exposure of binding sites for myosin, which is essential for muscle contraction.
Conclusion
Given the analysis, the correct statements are ii and iv. Therefore, the correct answer is option 'C' (i, ii, and iv). Understanding these components is crucial for comprehending the mechanisms of muscle contraction and cellular movement.
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Community Answer
Which of the statements given above is/are correct regarding the struc...
- Statement i is correct: Each actin filament is indeed composed of two helically wound 'F' actins.
- Statement ii is also correct: 'G' (Globular) actins serve as monomers that polymerize to form filamentous 'F' actins.
- Statement iii is incorrect: Tropomyosin runs parallel to 'F' actins and interacts with them, playing a crucial role in muscle contraction by regulating access to the binding sites on actin for myosin.
- Statement iv is correct: Troponin is distributed at regular intervals along the tropomyosin and is essential for regulating the binding sites for myosin on actin filaments during muscle contraction.
Thus, the correct statements are i, ii and iv, making Option c the right answer.
Line in NCERT: "Each actin (thin) filament is made of two 'F' (filamentous) actins helically wound to each other. Each 'F' actin is a polymer of monomeric 'G' (Globular) actins. Two filaments of another protein, tropomyosin also run close to the 'F' actins throughout its length. A complex protein Troponin is distributed at regular intervals on the tropomyosin. In the resting state a subunit of troponin masks the active binding sites for myosin on the actin filaments."
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Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer?.
Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Which of the statements given above is/are correct regarding the structure and function of actin filaments?i. Each actin filament is composed of two helically wound F (filamentous) actins.ii. G (Globular) actins are monomers that polymerize to form F actins.iii. Tropomyosin runs parallel to the F actins and does not interact with them.iv. Troponin is attached to tropomyosin at regular intervals and regulates the binding sites for myosin on the actin filaments.a)i and iib)ii and ivc)i, ii and ivd)i, ii and iiiCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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