How many Filaments are there in thin filament?

1. Two F-actin Filaments and two tropomyosin filaments

2. Two F-actin Filaments and one tropomyosin filaments

3. One F-actin filament and one tropomyosin filament

4. One F-actin and two tropomyosin filament

Subunit of troponin masks the

1. Active binding sites for Myosin on actin

2. Active binding sites for actin on Myosin

3. In resting state, active binding sites for Myosin on actin

4. In resting state, active binding sites for actin on Myosin

Each Myosin filament is also a

1. Polymeric Protein

2. Monomeric Protein

3. Monomeric Glycoprotein

4. Polymeric Glycoprotein

Which of the following is a monomeric protein of thick filament?

1. Meromyosins

2. Macromyosins

3. Tropomyosin

4. Troponin

Each meromyosin has two

1. globular head with a short arm

2. Important part- HMM and LMM

3. Tails and one head

4. Short arms and one tail

The HMM of muscle fiber has not got

1. Head

2. Short arm

3. Tail

4. Both 2 and 3

The LMM of muscle fiber is

1. Tail

2. Head

3. Short arm

4. Both 1 and 3

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

Sliding Filament Theory states that

1. Contraction of muscle fibre takes place by the sliding of thin filaments over the thick filaments

2. Contraction of muscle fibre takes place by the sliding of thick filament over thin Filaments

3. Relaxation of muscle fibre takes place by the sliding of thick filament over thin filaments

4. Relaxation of muscle fibre takes place by the sliding of thin filament over thick filament