PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a single strand of actin molecules.
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four strands of actin molecules wrapped together.
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hundreds of strands of actin molecules wrapped together.
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two strands of actin molecules wrapped together.
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Detailed explanation-1: -Actin filaments are made from the monomer, globular actin, or g-actin. G-actin assembles together through the hydrolysis of ATP to form f-actin, or filamentous actin. Two threadlike strands of filamentous actin twist together to make an actin filament, also known as a microfilament.
Detailed explanation-2: -An actin protein is the monomeric subunit of two types of filaments in cells: microfilaments, one of the three major components of the cytoskeleton, and thin filaments, part of the contractile apparatus in muscle cells.
Detailed explanation-3: -Microfilaments are made of two intertwined strands of actin. Of the three types of protein fibers in the cytoskeleton, microfilaments are the narrowest. They function in cellular movement, have a diameter of about 7 nm, and are made of two intertwined strands of a globular protein called actin (Figure 2).