CBSE Questions for Class 11 Medical Biology Locomotion And Movement Quiz 11 - MCQExams.com

Repetitive muscular activity at moderate levels, such as weight training, can result in
  • Denervation atrophy
  • Mood swings
  • Muscular hypertrophy
  • A decline in health
Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is/are incorrect?
(i) Each actin (thin filament) is made of 2F (filamentous) actins.
(ii) F-actin is the polymer of G (globular) actin.
(iii) 2F-actins are twisted into a helix.
(iv) Two stands of tropomyosin (protein) lie in the grooves of F-actin.
(v) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin.
(vi) Troponin forms the head of the myosin molecule.
(vii) Myosin is a polymerized protein.
  • (i), (ii) and (vi)
  • (ii), (iv) and (v)
  • Only (vi)
  • Only (iii)
State whether the following statements are true or false.
Actin is present in thin filament.
  • True
  • False
Each actin filament is made of
  • 2 'G' Actin molecules
  • 2 F Actin molecules
  • 1 F Actin molecules
  • 1 G Actin molecules
To treat myasthenia gravis, 
  • Acetylcholine esterase activity is inhibited
  • Receptors on motor end plate are reduced
  • Secretion from nerve terminals is reduced
  • Secretion from nerve terminals is enhanced
Which of the following is a component of thin filaments of a sarcomere?
  • Actin and myosin
  • Troponin and actin
  • Mysosin and troponin
  • Troponin, tropomyosin, actin
Osteoporosis is commonly caused due to:
  • Decreased level of progesterone
  • Decreased level of oestrogen
  • Increased level of progesterone
  • Increased level of oestrogen
Ram rotates the arm and looks to his left. Which of his body parts help him to do so?
  • Head and shoulder
  • Shoulder only
  • Shoulder and neck
  • Neck only
State whether this statement is true or false.
The bending of the arm to touch the shoulder with our fingers is due to the action of the shoulder. 
  • True
  • False
State whether the given statement is true or false.
If a scale is tied to the arm such that the centre of the scale is at the elbow, one can still bend his arm.
  • True
  • False
Which best describes the fossil record?
  • The fossil record cannot provide evidence of evolution.
  • The fossil record provides evidence of a common ancestor to many species.
  • The fossil record provides evidence that disputes the theory of evolution.
  • The fossil record is inaccurate because scientists are not able to date fossils.
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Practice Class 11 Medical Biology Quiz Questions and Answers