Final answer:
The actin filament is made up of 300 to 400 globular subunits called monomers, which polymerize to perform functions like muscle contraction and cellular motility.Option 1 is the correct answer.
Step-by-step explanation:
The actin filament is a polymer formed from 300 to 400 globular subunits called monomers. Globular actin (G-actin) monomers polymerize to form filamentous structures that are critical for a wide range of cellular processes. These monomers can be found in two forms: in a stiff, polymerized, gel form which provides stability, and in a more fluid, unpolymerized soluble form. The actin monomers work together with motor proteins, like myosin, to facilitate muscle contraction and other types of cellular motility. The actin filaments, made up of these actin monomers, are also frequently referred to as microfilaments.
Actin filaments, integral components of the cellular cytoskeleton, consist of 300 to 400 globular subunits known as monomers. These globular actin (G-actin) monomers exhibit dual forms: a rigid, polymerized, gel state providing structural stability, and a more fluid, unpolymerized, soluble state. As monomers, they collaborate with motor proteins, such as myosin, to orchestrate processes like muscle contraction and cellular motility. The actin filaments, constructed from these monomers, are commonly termed microfilaments. This dynamic system of polymerization and depolymerization enables diverse cellular functions, emphasizing the pivotal role of actin filaments in maintaining cellular structure, motility, and the execution of essential physiological processes.