GENERAL HISTOLOGY

Detailed explanation-1: -Microfilaments are thin (7 nm) molecules composed principally of actin protein subunits, which polymerize to form elongated actin filaments (F-actin). Individual actin molecules, called G-actin, carry ATP to provide energy for the polymerization process.

Detailed explanation-2: -Microfilaments are composed of actin protein subunits There is one high-affinity calcium binding site per G-actin monomer which stabilizes the globular configuration of the molecule. G-actin also has one ATP binding site per monomer. F-actin is a filamentous polymer, composed of G-actin monomers.

Detailed explanation-3: -Microfilaments. Microfilaments are composed of two strands of actin monomers twisted into helical filaments that have intrinsic polarity. All cells, including neurons, have a microfilament-rich, mesh-like network on the cytoplasmic side of the plasma membrane.

Detailed explanation-4: -Skeletal muscle fiber is made up of two types of filaments. Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Hence Component of actin filament of a sarcomere is Actin, troponin, and tropomyosin. So, the correct answer is ‘Actin, troponin, and tropomyosin’.