Question

Actin filaments may form each of the following except A) 3D filament networks (gels).

B) contractile bundles.
C) branched networks.
D) bundles of parallel filaments.
E) axonemes containing doublet microfilaments.

Answer 1

Among the listed structures, actin filaments do not form axonemes containing doublet microfilaments, as axonemes are characteristic of microtubules found in cilia and flagella.

Step-by-step explanation:

Actin filaments, with a diameter of about 7 nm, are composed of two intertwined strands of actin and are involved in various cellular processes. These actin filaments can form 3D filament networks (gels), contractile bundles, branched networks, and bundles of parallel filaments, all of which are part of the dynamic cytoskeletal system in eukaryotic cells. Among the listed options, actin filaments do not form axonemes containing doublet microfilaments. Axonemes are a feature of microtubules, not actin filaments, and are found in structures such as cilia and flagella, where they organize into doublet microtubules, not actin-based structures like microfilaments.