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Support and Movement MCQs for MDCAT Practice

Biology section, Support and Movement chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 1,417 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    Out of three polypeptides of troponin one binds to the actin chain, another binds to tropomyosin while third binds:
    • Myosin
    • Collagen
    • Sodium ions
    • Calcium ions (correct answer)
    Correct answer: D
    Troponin's subunits have specific binding roles: one to actin, one to tropomyosin, and the third to calcium ions, regulating muscle contraction.
  2. Question 2
    A muscle of fascicle is a:
    • Bundle of connective tissue
    • Bundle of myofibrils
    • Bundle of muscle fibres (correct answer)
    • Muscle cells
    Correct answer: C
    A muscle fascicle is a bundle of muscle fibers, which are the individual muscle cells responsible for contraction.
  3. Question 3
    Over-lapping of thick filament occurs in:
    • A-Band (correct answer)
    • M-line
    • I-band
    • Z-line
    Correct answer: A
    The A-band represents the full length of the thick filament, including the region where it overlaps with thin filaments during muscle contraction.
  4. Question 4
    What is the basic unit of muscle fibre?
    • Myofibril (correct answer)
    • Z-line
    • M-line
    • Fibroin
    Correct answer: A
    The fundamental contractile unit of a muscle fiber, responsible for generating force, is the myofibril, composed of repeating sarcomeres.
  5. Question 5
    Process of shedding of exoskeleton is called:
    • Metamorphosis
    • Regeneration
    • Budding
    • Ecdysis (correct answer)
    Correct answer: D
    The process of shedding an exoskeleton in invertebrates, crucial for growth, is known as ecdysis. Other terms like metamorphosis, regeneration, and budding represent different biological processes.
  6. Question 6
    A cricket player is chasing a fastball in the field. Which one of the following groups of bones is directly contributing to this movement?
    • Femur, malleus, tibia, metatarsals
    • Pelvis, ulna, patella, tarsals
    • Sternum, femur, tibia, fibula
    • Tarsals, femur, metatarsals, tibia (correct answer)
    Correct answer: D
    This question assesses the ability to identify the primary bones involved in lower limb locomotion, crucial for understanding skeletal functions in movement.
  7. Question 7
    Skeletal muscle is described by all of the following except:
    • Striated
    • Voluntary
    • Both "A" and "B"
    • Autorhythmic (correct answer)
    Correct answer: D
    Skeletal muscle is striated and voluntary, distinguishing it from cardiac muscle, which is autorhythmic, and smooth muscle, which is involuntary and non-striated.
  8. Question 8
    Actin and myosin are the basic proteins involved in contractile machinery of our body to which type of proteins do they belong?
    • Globular proteins
    • Intermediate proteins
    • Fibrous Proteins (correct answer)
    • Integral proteins
    Correct answer: C
    Actin & myosin, crucial for muscle contraction, are classified as fibrous proteins due to their elongated structure and functional role in providing strength and support.

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