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Which of the following statements are co...

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).

A

`i` , iii and iv are correct

B

`i` and iii are correct

C

`i` , ii and iii are correct

D

`i` , ii and iv are correct

Text Solution

Verified by Experts

The correct Answer is:
D
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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.

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Which of the following statements is/are not correct regarding connective tissues ? (i) They are most abundant and widely distributed in the body of complex animals (ii) They connect and support other tissues (iii) They include diverse tissues such as bones, cartilage, tendons, adipose and other loose connective tissues. (iv) They form the internal and external lining of many organs (v) In all connective tissues except blood, the cells secrete fibres of structural proteins like collagen and elastin.

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Fill in the blanks with the suitable words Each actin (thin) filament is made of two 'F' (filamentous) actins (a) wound to each other. Each 'F' actin is a polymer of (b) actins. Two filaments of another protein (c) ____also run close to the 'F' actins throughout its length. A complex protein (d) ____ is distributed at regular intervals on the tropomyosin. in the resting state a submit of troponin masks the active binding sites for (e)____ on the (c)____filaments.

Which of the following statement is // are correct regarding F^(-) and CI^(-) (i) Cl^(-) can give up an electron more easily than F^(-) (ii) Cl^(-) is smaller in size than F^(-) (iii) Cl^(-) is a better reducing agent then F^(-) (iv) F^(-) can be oxidized more readily than Cl^(-)

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

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