Final answer:
The statements that are not features of actin polymerization include "myosin interaction with the M line" and "overlap of myosin and actin," as they pertain to muscle contraction rather than the polymerization process of actin.
The answer is option ⇒a and b
Step-by-step explanation:
Actin polymerization refers to the process of forming long chains or filaments of actin protein molecules.
During actin polymerization, the following features occur:
1. Nucleation: Actin monomers come together to form a stable nucleus or seed. This is the initial step of polymerization.
2. Elongation: Actin monomers add onto the ends of the existing filament, extending the chain or filament. This process continues until the filament reaches a steady-state length.
3. Treadmilling: Actin filaments undergo dynamic assembly and disassembly at their ends. While new monomers are added at one end (the barbed end), existing monomers are dissociated from the other end (the pointed end). This allows the actin filament to grow at one end while shrinking at the other, resulting in a net movement of actin filaments within the cell.
4. Branching: In certain cellular structures, actin filaments can branch off from existing filaments. This branching helps to create a more complex network of actin filaments, providing structural support and allowing for various cellular processes such as cell motility and cell shape changes.
The answer is option ⇒a and b
Your question is incomplete, but most probably the full question was:
Which of the following are not features of Actin polymerization ...
(Select all that apply)
- (a) myosin interaction with the M line
- (b) overlap of myosin and actin
- (c) actin attachments to the Z line
- (d) none of the above