Myosin Molecule

Q. Which molecule has the ATP binding site needed for muscle contraction?

1. Myosin
2. Actin
3. Troponin
4. Tropomyosin

Q. Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

1. Potassium
2. Calcium
3. Magnesium
4. Sodium

Q. Which one of the following option gives the correct categorisation of structure of contractile proteins ?

	Actin	Myosin
1	Troponin	Actinin
2	Troponin tropomyosin	HMM and LMM
3	'G' - actin	Tropomyosin
4	Tropomyosin troponin	$C{a}^{++}$ binding site

1. 1
2. 2
3. 3
4. 4

Q. Tubules of golgi body are formed due to fenestrations of cisternae.What does this mean?

Q. Binding and unbinding of which ion, facilitates the contraction and relaxation of mucles?

1. Calcium
2. Sodium
3. Potassium
4. Oxygen

Q. Which molecule has the ATP binding site needed for muscle contraction?

1. Myosin
2. Actin
3. Troponin
4. Tropomyosin

Q.

A myosin molecule has________ ATP binding sites and ________actin binding sites

1. 1 and 2

2. 2 and 1

3. 2 and 2

4. 1 and 1

Q. The contractile protein of skeletal muscle involving ATPase activity is

1. Troponin
2. Myosin
3. Tropomyosin
4. Alpha - actinin

Q.

Label the part of myosin structure

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1. Myosin heads Tail Actin binding sites ATP binding sites

2. Actin binding sites Tail ATP binding sites Myosin heads

3. Myosin heads Tail ATP binding sites Actin binding sites

4. ATP binding sites Tail Myosin heads Actin binding sites

Q. Which of the following is an ATP-dependent motor protein

1. Actin
2. Myosin
3. Troponin
4. Tropomyosin

Q. Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction

1. Sodium
2. Potassium
3. Magnesium
4. Calcium

Q. Name the chemical to check over stimulation of muscle fibre and explain the process.

Q. How renin andANF relate to each other