Final Answer:
The true statement of nucleotides bound to actin monomers b) Nucleotide hydrolysis increases affinity between monomer and filament.
Step-by-step explanation:
In actin dynamics, nucleotides play a crucial role. Actin monomers bind to ATP or ADP, and the hydrolysis of ATP to ADP is a key step in actin polymerization. Let's break down the options:
Nucleotide hydrolysis decreases affinity between monomer and filament.
This statement is incorrect. Nucleotide hydrolysis actually increases the affinity between the monomer and the filament.
Nucleotide hydrolysis increases affinity between monomer and filament.
This statement is correct. After hydrolysis of ATP to ADP, the affinity between the actin monomer and the filament increases, promoting polymerization.
Monomer dissociation from filament triggers nucleotide hydrolysis.
This statement is incorrect. Nucleotide hydrolysis occurs after monomer incorporation into the filament, not dissociation.
Monomer binding to filament triggers conversion of ADP to ATP.
This statement is incorrect. Monomer binding is associated with the hydrolysis of ATP to ADP.
In summary, option (b) is true. Nucleotide hydrolysis increases the affinity between actin monomers and filaments, promoting the formation of actin polymers.