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Read the statements regarding muscle proteins.
(i) Actin is a thin filament and is made up of two F-actins,
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin
(iii) Myosin is a thick filament which is also a polymerized protein
(iv) The globular head of meromyosin consists of light meromyosin (LMM)
  • a)
    (i), (ii) and (iii) are correct
  • b)
    (i), (ii) and (iv) are correct
  • c)
    (i) and (iii) are correct
  • d)
    (ii) and (iv) are correct
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Read the statements regarding muscle proteins.(i)Actin is a thin filam...
Each actin (thin) filament is made of two 'F' (filamentous) actin helically wound to each other. Each F actin is a polymer of monomeric 'G' (globular) actins. Myosin (thick) filament is a polymerised protein. Many monomeric proteins called meromyosins constitute one thick filament. Tropomyosin is a fibrous molecule that attaches to F actin in the groove between its filament. The globular head of meromyosin consists of heavy meromyosin.
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Most Upvoted Answer
Read the statements regarding muscle proteins.(i)Actin is a thin filam...
Muscle proteins play a vital role in muscle contraction and are responsible for the movement of our body. Let's analyze each statement to understand the correctness of the statements.

(i) Actin is a thin filament and is made up of two F-actins:
- This statement is correct. Actin is a thin filament that forms the backbone of the muscle fiber. It is composed of two F-actin strands, which are helically twisted around each other.

(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin:
- This statement is correct. Tropomyosin is a complex protein that lies along the groove of the actin helix. It is associated with troponin at regular intervals. Troponin is a complex of three subunits - troponin C, troponin I, and troponin T. It is involved in regulating muscle contraction.

(iii) Myosin is a thick filament which is also a polymerized protein:
- This statement is correct. Myosin is a thick filament that interacts with actin during muscle contraction. It is a polymerized protein composed of two heavy chains and four light chains. The heavy chains form the backbone of the myosin molecule, while the light chains are involved in regulating its activity.

(iv) The globular head of meromyosin consists of light meromyosin (LMM):
- This statement is incorrect. Meromyosin refers to the two parts of the myosin molecule - the rod-shaped tail and the globular head. The globular head of myosin consists of heavy meromyosin (HMM), not light meromyosin (LMM). HMM is responsible for binding to actin and generating force during muscle contraction.

Based on the analysis of the statements, we can conclude that statements (i) and (iii) are correct, while statement (ii) and (iv) are incorrect. Therefore, the correct answer is option 'C' - (i) and (iii) are correct.
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Read the statements regarding muscle proteins.(i)Actin is a thin filament and is made up of two F-actins,(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin(iii) Myosin is a thick filament which is also a polymerized protein(iv) The globular head of meromyosin consists of light meromyosin (LMM)a)(i), (ii) and (iii) are correctb)(i), (ii) and (iv) are correctc)(i) and (iii) are correctd)(ii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer?
Question Description
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