NEET Zoology Muscle Contraction MCQ Question
If a muscle fibre contains 3000 actin filaments and each actin filament is formed by 2 F-actins helically wound together, how many G-actin molecules are present in the muscle fibre?
6000
3000
12000
24000
Correct Answer
Detailed Explanation
Each actin filament is made of two F-actins, and each F-actin is a polymer of G-actin molecules. Thus, for 3000 actin filaments, there are 2 F-actins per filament, leading to 6000 F-actins. Since each F-actin is composed of G-actins, the total number of G-actin molecules is 12000 (2 G-actins per F-actin), resulting in 24000 G-actin molecules.
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