Which of the following has ATPase activity?

1. Actin                            2. Tropomyosin

3. Head of myosin             4. Troponin

Subtopic:  Skeletal Muscle: Myofilaments |
 76%
From NCERT
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The globular head of the myosin filament has active site/s for binding to:

 I. ATP

II. the binding site for actin filament 

III. Calcium

1. Only I

2. Only I and II

3. Only II and III

4. I, II, and III

Subtopic:  Skeletal Muscle: Myofilaments |
 69%
From NCERT
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The contractile protein of skeletal muscle involving ATPase activity is :

1. tropomyosin                 

2. myosin       

3. α-actinin                     

4. troponin

Subtopic:  Skeletal Muscle: Myofilaments |
 77%
From NCERT
NEET - 2006
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Skeletal muscles appear striated due to the presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and color?

       Protein                  Colour                 Property

(1)  Myosin                   Light                 Anisotropic

(2)  Actin                      Dark                 Anisotropic

(3)  Myosin                   Dark                  Isotropic

(4)  Actin                      Light                  Isotropic

Subtopic:  Skeletal Muscle: Myofilaments |
 82%
From NCERT
AIIMS - 2011
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The functions of tropomyosin in skeletal muscle include:
(1) Sliding on actin to produce shortening

(2) Release Ca+2 after initiation of contraction

(3) Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin

(4) Generates ATP

Subtopic:  Skeletal Muscle: Myofilaments |
 65%
From NCERT
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Following is the figure of actin (thin) filaments. Identify A, B and C:

1. A - Tropomyosin, B - Troponin, C - F-actin

2. A - Troponin, B - Myosin, C - Tropomyosin

3. A - Troponin, B - Tropomyosin, C - Myosin

4. A - Troponin, B - Tropomyosin, C - F-actin

Subtopic:  Skeletal Muscle: Myofilaments |
 77%
From NCERT
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The above figure is related with myosin monomer (meromyosin). Identify A to C:

(1) A - head, B - cross arm, C - GTP binding sites

(2) A - head, B - cross arm, C - Ca+2 binding sites

(3) A - head, B - cross arm, C - ATP binding sites

(4) A - cross arm, B - head, C - ATP binding sites

Subtopic:  Skeletal Muscle: Myofilaments |
 89%
From NCERT
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ATPase of the muscle is located in:

(1) Actinin            

(2) Troponin         

(3) Myosin            

(4) Actin

Subtopic:  Skeletal Muscle: Myofilaments |
 88%
From NCERT
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Which of the following is not correct?

(1) Cilia and flagella are the outgrowths of the cell membrane

(2) Flagellar movements help in the swimming of spermatozoa, maintenance of water current in the canal system of sponges

(3) Locomotion of Protozoan like Euglena is also carried by cillia

(4) 40-50 percentage of body weight of a human adult is contributed by muscles

Subtopic:  Introduction to Locomotion | Skeletal Muscle: Myofilaments |
 73%
From NCERT
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Sarcoplasmic reticulum, sarcolemma, sarcoplasm are the features of

(1) Muscle fibre

(2) Myofibrils

(3) Myofilaments

(4) Muscle

Subtopic:  Skeletal Muscle: Myofilaments |
 82%
From NCERT
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