Careful! Only The Best Of Biology Students Can Pass This Test!

71 Questions

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Careful! Only The Best Of Biology Students Can Pass This Test!

Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. Careful! Only the best of biology students can pass this test! Choose your answers wisely and you will get your final score at the end on the quiz! ALL THE BEST


Questions and Answers
  • 1. 
    The functional unit of contractile system in a striated muscle is …..
    • A. 

      Sarcomere

    • B. 

      A-band

    • C. 

      Myofibril

    • D. 

      I-band

  • 2. 
    Which of the following is the contractile protein of a muscle?
    • A. 

      Myosin

    • B. 

      Actin

    • C. 

      Intercalated disc

    • D. 

      All of the above

  • 3. 
    Which statement is correct for muscle contraction?
    • A. 

      Length of I-band remains constant

    • B. 

      Length of A-band remains constant

    • C. 

      Length of sarcomere remains constant

    • D. 

      Size of H- zone remains constant

  • 4. 
    Red muscles are rich in …..
    • A. 

      Hemoglobin and glucose

    • B. 

      Actin only

    • C. 

      Hemoglobin and lactic acid

    • D. 

      Myoglobin and cytochromes

  • 5. 
    Sarcolemma is the membrane which covers …..
    • A. 

      Muscle bundle

    • B. 

      Nerve fiber

    • C. 

      Muscle fiber

    • D. 

      Muscle fibril

  • 6. 
    Intercostal muscles are found in ….
    • A. 

      Thigh

    • B. 

      Diaphragm

    • C. 

      Ribs

    • D. 

      Abdomen

  • 7. 
    When a muscle fiber shortens, the following also shortens.........
    • A. 

      Sarcomere

    • B. 

      Actin filament

    • C. 

      Myosin filament

    • D. 

      Z-line

  • 8. 
    What are dark bands that define the two ends of each sacromere called?
    • A. 

      Z-Lines

    • B. 

      Myosin

    • C. 

      Sarcomeres

    • D. 

      Actin

  • 9. 
    The Functional Unit of the contractile system in Striated Muscles is ……
    • A. 

      Z-Band

    • B. 

      Sarcomere

    • C. 

      Myofibril

    • D. 

      Cross bridges

  • 10. 
    When a muscle gets shorter and thicker It Is a(an) _______ muscle.
    • A. 

      Involuntary

    • B. 

      Relaxing

    • C. 

      Skeletal

    • D. 

      Contracting

  • 11. 
    Muscle Fatigue sets in due to non-availability of……...
    • A. 

      Actin-binding Site

    • B. 

      Calcium

    • C. 

      ATP

    • D. 

      Mg cofactor

  • 12. 
    Light band has which of the following filament proteins?
    • A. 

      Myosin and actin

    • B. 

      Actin

    • C. 

      Myosin

    • D. 

      None of these

  • 13. 
    Smooth Muscle is not cross striated because ……
    • A. 

      Of the regular arrangement of actin and myosin filaments

    • B. 

      Myosin and actin filaments are organized into well-ordered sarcomeres and myofibrils.

    • C. 

      Myosin and actin fibers are arranged an angles to each other as they run through the cell. 

    • D. 

      Globular heads protruding from myosin filaments do not attach with actin filaments to form cross bridges

  • 14. 
    Intercaled discs are most likely to be observed in.........
    • A. 

      Longitudinal section of skeletal muscle

    • B. 

      Transverse section of skeletal muscle

    • C. 

      Transverse section of cardiac muscle

    • D. 

      Longitudinal section of cardiac muscle

  • 15. 
    When skeletal muscle contracts an arrangement of the alternating light and dark bands traversing each skeletal muscle cell changes. Which of the following statements is not correct?
    • A. 

      The dark A-bands will remain a constant length

    • B. 

      The space occupied by the H-zone will not change

    • C. 

      The light I-bands will shorten

    • D. 

      The z-lines come closer together

  • 16. 
    Concerning Cardiac and Skeletal muscle, which statement is accurate?
    • A. 

      Cardiac muscle fibers are not striated whereas skeletal muscle fibers are striated.

    • B. 

      Cardiac myofibril nuclei are placed away from the center, whereas skeletal myofibril nuclei are centrally placed.

    • C. 

      Skeletal muscle fibers exhibit more branching than cardiac muscle fibers

    • D. 

      Cardiac muscle contains structures known as intercalated discs

  • 17. 
    Which of the following statements is correct?
    • A. 

      A Skeletal muscle fiber consists of numerous skeletal muscle cells joined together by intercalated discs

    • B. 

      Skeletal muscle cells have a fusiform appearance with multinuclei centrally placed

    • C. 

      Smooth muscle has single nuclei that are peripherally placed

    • D. 

      None of the above

  • 18. 
    The direct energy store for the muscle is ……
    • A. 

      ATP

    • B. 

      Glycogen

    • C. 

      Glucose

    • D. 

      Lactic acid

  • 19. 
    What happens during movement of limbs in Man?
    • A. 

      Limbs are supported by the skeletal system during movement

    • B. 

      Muscles of limbs contract and relax by taking an order from the nervous system

    • C. 

      Movement of limbs is done by the contraction and relaxation of the muscles

    • D. 

      All of the above

  • 20. 
    What does the area (R) represent in the following figure?
    • A. 

      Neuro-muscular junction

    • B. 

      Motor end plate

    • C. 

      Motor unit

    • D. 

      Myofibrils

  • 21. 
    The specialized part of the cell membrane of the muscle fiber identified as .....
    • A. 

      Motor unit

    • B. 

      Axon Terminal of Motor Neuron

    • C. 

      Motor end plate

    • D. 

      Vesicle

  • 22. 
    The organelle that contains actin and myosin is .........
    • A. 

      Tendon

    • B. 

      Sarcolemma

    • C. 

      Myofibril

    • D. 

      Fiber

  • 23. 
    A bundle of muscle cells is called ……
    • A. 

      Sarcomere

    • B. 

      Fiber

    • C. 

      Fascicle

    • D. 

      Tendon

  • 24. 
    What is the importance of calcium ions in muscular contraction?
    • A. 

      Causes ATP binding to actin.

    • B. 

      Increases the action potential along the sarcolemma.

    • C. 

      Binds to protein receptors on the sarcolemma.

    • D. 

      Activates the binding of myosin to actin.

  • 25. 
    The energy needed to perform a muscle contraction comes directly from .....
    • A. 

      ATP

    • B. 

      Oxygen

    • C. 

      Glucose

    • D. 

      Calcium

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