A- Actin filaments occur in two forms: the mo | vedclass

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(D) Assertion $(A)$ is incorrect because $G$-actin (Globular actin) is the monomeric form,while $F$-actin (Filamentous actin) is the polymeric form. T

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$A$ is incorrect and $R$ is correct.

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(D) Assertion $(A)$ is incorrect because $G$-actin (Globular actin) is the monomeric form,while $F$-actin (Filamentous actin) is the polymeric form. The statement incorrectly swapped these terms.Reason $(R)$ is correct. Tropomyosin is indeed a rod-shaped fibrous protein that forms two helical strands,which run along the length of the $F$-actin filaments to regulate muscle contraction.

$A-$ Actin filaments occur in two forms: the monomeric $G$-actin and the polymeric $F$-actin.
$R-$ Tropomyosin is a rod-shaped fibrous protein. Tropomyosin forms two helical strands,which are wrapped around the $F$-actin filaments.

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$A-$ Actin filaments occur in two forms: the monomeric $G$-actin and the polymeric $F$-actin.$R-$ Tropomyosin is a rod-shaped fibrous protein. Tropomyosin forms two helical strands,which are wrapped around the $F$-actin filaments.