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Zoology MCQs for NEET — Practice Questions with Answers

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How many F actins are there in a thin filament?

A. Two B. Many C. Only one D. Depends upon thickness

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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How many Filaments are there in thin filament?

A. Two actin Filaments and two tropomyosin filaments B. Two actin Filaments and one tropomyosin filaments C. One actin filament and one tropomyosin filament D. One actin and two tropomyosin filament

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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Subunit of troponin masks the

A. Active binding sites for Myosin on actin B. Active binding sites for actin on Myosin C. In resting state, active binding sites for Myosin on actin D. In resting state, active binding sites for actin on Myosin

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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Each Myosin filament is also a

A. Polymeric Protein B. Monomeric Protein C. Monomeric Glycoprotein D. Polymeric Glycoprotein

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

Myosin also called thick filament, made up of polymerised protein called myosin.

Note: The monomeric proteins called meromyosins polymerised to form the myosin protein.

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

A. Meromyosins B. Macromyosins C. Tropomyosin D. Troponin

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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Each meromyosin has two

A. globular head with a short arm B. Important part- HMM and LMM C. Tails and one head D. Short arms and one tail

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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The HMM of muscle fibre has not got

A. Head B. Short arm C. Tail D. Both B and C

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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The LMM of muscle fibre is

A. Tail B. Head C. Short arm D. Both A and C

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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The head part of HMM of muscle fibre is

A. Globular B. Triangular C. Filamentous D. Both B and C

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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The globular head is/has

A. An active ATPase enzyme B. Binding sites for ATP C. active sites for actin D. All of these

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Explanation

NCERT page number 306

20.2.1 Structure of Contractile Protein

Locomotion And Movement

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