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[A] : Each myosin filament is composed o...

[A] : Each myosin filament is composed of about 500 thread iike myosin molecules.
[R]: Actin combines with myosin to form a contractiie complex.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
B
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Read the given statements and select the correct option. Statement 1: A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin. Statement 2: Myosin and actin together a form a contractile apparatus.

Assertion : Ca^(2+) plays important role in the muscle contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex .

Assertion : Ca^(2+) plays important role in the musclc contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex . (a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. (b (b) If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion. (c) If Assertion is true, but Reason is false . (d) If both Assertion and Reason are false.

Read the following statements (i) In cardiac muscle fibres sacroplasmic reticulum is poorly formed (ii)B Blood supply is scanty in case of smooth muscle fibres (iii) Tropomyosin occurs in actin filaments in the form of complexes which are arranged over actin fibres and represent sites where myosin binds to actin. (iv) Salts of citrate and oxalates act as anticoagulants as they precipitate Ca^(2+) Select the correct statements

Select the total number of false statement from the following (i) The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for Myosin. (ii) Each Myosin filament is also a polymerized protein (iii) Many monomeric proteins celled Meromyosins constitute one thick filament. (iv) Each meromyosin has two important parts, a globular head with a short arm and a tail, the former being called the heavy meromyosin (HMA) and the latter, the light meromysin (LMN). (v) The HMM component, i.e., the head and short arm projects outwards at regular distance and angle from each other from the surface of a polymerized myosin filament and is known as cross arm (a) 5 (b) 4 (c) 2 (d)1

Which area/band in a muscle has oth actin and myosin filaments.

One myosin filament in the myofibril of skeletal muscle fibre is surrounded by how many actin filaments ?

Which of the following statements are correct regarding muscle proteins ? (i) Actin is a thin filament and is mde up to two F-actin (ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin (iii) Myosin is a thick filament which is also a polymerised protein. (iv) The globular head of meromyosin consists of light meromyosin (LMM).

Which of the following statements about the molecular arrangement of actin and mysin In myofibre is/are incorrect ? (i) Each actin (thin filament) is made of 2F (filamentous) actins. (ii) F-actin is the polymer of G (globular) actin. (iii) 2F0actins are twisted into a helix. (iv) Two strands of tropomyosin (protein) lie in the grooves of F-actin. (v) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin. (vi) Troponin forms the head of the myosin molecule. (vii) The myosin is a polymerised protein.

Sarcomere, actin filaments, myosin fillaments, sarcoplasmic reticulum.

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