Final answer:
The proteins and their functions are matched as follows: Myosin contracts near the rear of the cell, ARP proteins nucleate new actin filaments, Profilin regulates actin monomer availability, Integrins are involved in focal contacts, and Formins aid in the growth of actin filaments.
Step-by-step explanation:
Matching the proteins with their functions involves understanding the roles they play in cell motility and structure:
- Myosin – D. Contracting near the rear of the cell
- ARP proteins – A. Nucleation of new actin filaments at the side of an existing filament
- Profilin – B. Regulation of the availability of actin monomers
- Integrins – E. Involvement in focal contacts
- Formins – C. Involves the growth of straight, unbranched actin filaments
Myosin is a motor protein that works with actin filaments to facilitate muscle contraction and cellular movement. ARP proteins help to build web-like networks by nucleating actin filaments. Profilin binds to actin monomers, thus regulating their availability for polymerization into microfilaments. Integrins play a role in cell adhesion, anchoring cells to the extracellular matrix and transmitting signals. Formins are important in guiding the elongation of actin filaments during cell movement and shape changes.