Question

Which of the following is not a function of actin-binding proteins? Select one:

a. Filament severing/depolymerization
b. Filament initiation and polymerization
c. Incorporation of microfilaments into the extracellular matrix
d. End capping

Answer 1

Actin-binding proteins are involved in various processes such as filament severing/depolymerization, filament initiation and polymerization, and end-capping. However, they do not participate in the incorporation of microfilaments into the extracellular matrix.

Step-by-step explanation:

The correct answer is c. Incorporation of microfilaments into the extracellular matrix. Actin-binding proteins play a crucial role in the organization and function of the cytoskeleton. They are involved in various processes such as filament severing/depolymerization, filament initiation and polymerization, and end-capping. However, they do not participate in the incorporation of microfilaments into the extracellular matrix.

Answer 2

option d. end capping

Step-by-step explanation:

The ABP or actin binding proteins are attached with actin. The actin filaments are attached with ABP. The actin binding proteins provide large number of monomers of actin for polymerization. The ABP also help in new filament assembly. The ABP function in promoting the process of elongation. The ABP allows filament severing/depolymerization.

The end is attached with cap having the pointed or barbed ends. The barbed end gets attached with capping proteins (CP) thus blocking polymerization. So, ABP are not involved in end capping. Thus, option d is incorrect.