[Campbell Biology P.165] Based on the provided text and Figure 6.25, which of the following ... | Practice Question

Based on the provided text and Figure 6.25, which of the following statements about microfilaments are correct? Select all that apply

  • A: They form a network just inside the plasma membrane, contributing to the semisolid consistency of the cell cortex.
  • B: Bundles of microfilaments make up the core of microvilli, which are delicate projections that increase the cell's surface area.
  • C: They are primarily involved in the "9+2" arrangement of cilia and flagella, providing structural support.
  • D: Microfilaments are also known as intermediate filaments, playing a role in anchoring cellular extensions.

Explanation

The text states that "network formed by microfilaments just to the inside of the plasma membrane cortical microfilaments helps support the cell's shape... This network gives the outer cytoplasmic layer of a cell, called the cortex, the semisolid consistency of a gel" Option A . It also mentions that "bundles of microfilaments make up the core of microvilli, delicate projections that increase the cell's surface area" Option B . Figure 6.25 further illustrates microfilaments as actin filaments forming the core of microvilli.