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MMLU / Which of the following statements concerning a sarcomere of a striated muscle…

Problem

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question

Which of the following statements concerning a sarcomere of a striated muscle (such as skeletal muscle) is correct?

choices

  1. During contraction H zones become elongated.
  2. In the relaxed position tropomyosin impedes myosin's access to the binding site of actin.
  3. Each myosin helical tail contains an actinbinding site and an ATP-hydrolyzing site.
  4. The proteins troponin and tropomyosin constitute the thick and thin filaments, respectively.

subject

college_biology

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