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Locomotion and Movement Test - 15

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Locomotion and Movement Test - 15
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  • Question 1
    1 / -0
    ATPase enzyme needed for muscle contraction is located in
    Solution
    • Myosin ATPase is an enzyme with ATP phosphohydrolase (actin-translocating). This enzyme catalyses the following chemical reaction: ATP + $$H_2O$$ = ADP + phosphate. 

    • ATP hydrolysis provides energy for actomyosin contraction. Myosin is not only an actin-binding protein, but it is also an ATPase. 

    • Myosin has ATP-dependent motor proteins that help in muscle contraction. They are responsible for actin-based motility. 

      Hence, Option c is the answer.
  • Question 2
    1 / -0
    The joints between the two vertebrae are _________.
  • Question 3
    1 / -0
    Actin binding sites are located on
    Solution
    Actin belongs to the family of globular multifunctional protein that forms microfilaments in muscle fibers. The associated proteins along with actin found in thin filaments are troponin and tropomyosin. However, the binding sites for actin are located in meromyosin
  • Question 4
    1 / -0
    The segment of a myofibril between two Z lines is called:
    Solution
    Sarcomere is the contractile unit of a myofibril in striated muscle. The sarcomeres are joined end to end to form a myofibril. Each sarcomere is composed of a Z-line at either end, to which the actin filaments are attached.
    Thus, the correct answer is option (C), 'Sarcomere'.
  • Question 5
    1 / -0
    The calcium receptive protein of the muscle is
    Solution
    Troponin is a globular protein complex. This is the protein which is involved in muscle contraction. It is the calcium receptive protein of the muscle. It occurs with tropomyosin in the thin filaments of muscle tissue. The binding and the release of the calcium ions causes conformational change in the structure of troponin. This results in the contraction and relaxation of the muscles.
    Thus, the correct answer is option D. 
  • Question 6
    1 / -0
    The thickness of a striated muscle fibre increases________.
  • Question 7
    1 / -0
    Which one of the proteins is enzymatic and structural?
    Solution
    Myosin is a component of the myofibres in skeletal, smooth, and cardiac tissue. It also plays a role enzymatically, as it is an ATPase. It is an integral protein of muscle which mainly helps in muscle contraction by crosslinking with actin. So, the correct answer is option B.
  • Question 8
    1 / -0
    In actomyosin complex, for one unit of actin the number of units of myosin is
    Solution
    Actinomyosin is a contractile complex of actin and myosin that together with ATP is active during muscular contraction. The term actomyosin was coined by Szent-Gyorgyi. Actomyosin contracts in the presence of ATP and K-ions and is made of equal number of actin and myosin.
  • Question 9
    1 / -0
    If the collagen fibres hold the bones firmly together such that they cannot change the position relative to each other, the joint is
    Solution
    • An immovable joint has two bones joined together with little or no movement and where no joint cavity exists. 
    • Another name for an immovable joint is synarthrosis, which means immovable. 
  • Question 10
    1 / -0
    Functional unit of a striated muscle is
    Solution
    The sarcomere is the functional unit of a striated muscle. This means it is the most basic unit that makes up our skeletal muscle. Sarcomeres are connected end to end by Z lines along the length of each myofibril. 
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