Final answer:
(b) 'Actin filaments are usually excluded from the cell cortex,' as actin filaments are typically found in the cortex. Other statements regarding myosin, integrins, ARPs, and cytochalasins are true within the context of cell biology.
Step-by-step explanation:
(b) Actin filaments are usually excluded from the cell cortex. All other statements are true.
Actin is a fundamental component of the cytoskeleton found in eukaryotic cells and is often positioned in the cell cortex just beneath the plasma membrane. It plays a key role in maintaining the shape of the cell and in the formation of the contractile ring during cell division. It is incorrect to assert that actin filaments are usually excluded from the cell cortex since they are a vital part of the cell's cortical structure.
Integrins are indeed transmembrane proteins that play a significant role in binding cells to the extracellular matrix (ECM), which typically consists of glycoproteins like collagen. ARPs (Actin-related proteins) are known to nucleate the assembly of branched actin filaments, especially in the cortex of the cell where the dynamic rearrangement of the actin cytoskeleton facilitates various cell movements and processes. Myosin, which is mainly a motor protein that interacts with actin filaments, can sometimes be anchored to the plasma membrane, aiding in cellular contractility, and cytochalasins are drugs that are known to inhibit actin polymerization, preventing the formation of actin filaments.