Question

Which of the following describes the structure of an actin filament?

a. Bipolar array
b. Fibers growing out from a single point in a cell
c. Hollow cylinder
d. Bundle of thin fibers
e. Double helix

Answer 1

The structure of an actin filament is described as a double helix (E), made up of two intertwined strands of globular protein actin, which are involved in cellular movement and structure.

Step-by-step explanation:

Actin filaments, also known as microfilaments, are composed of a double helix of two intertwined strands of actin, a globular protein. These actin filaments form a helical structure that is about 7 nm in diameter, making them the thinnest components of the cytoskeleton. Their dynamic nature allows for the polymerization and depolymerization of actin, enabling a variety of cellular processes. In muscle cells, actin and myosin interact to facilitate muscle contraction, highlighting the importance of actin filaments in cellular movement and support.

So, the answer is E.