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

Which one of the following pairs of chemical substances, is correctly categorised?

Myosin filaments are:-

1. thin filament 

2. found only in I band

3. absent from H zone

4. attached to M line

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

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

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

The head part of the HMM of muscle fiber is

1. Globular

2. Triangular

3. Filamentous

4. Both 2 and 3

The globular head is/has

1. An active ATPase enzyme

2. Binding sites for ATP

3. active sites for actin

4. All of these

…………… projects outwards at regular …….. from each other from the surface of polymerized Myosin Filaments and is also known as …….

1. Head and short arm, angle, cross arm

2. Head and short arm, distance, cross arm

3. Both 1 and 2

4. Head and short arm, distance, LMM

In a myosin molecule HMM (heavy meromyosin) is
present in
(i) Globular head (ii) Short arm (iii) Myosin tail

1. (i), (ii), (iii) 

2. (i) only

3. (i), (ii) only 

4. (iii) only