79. Which one of the following is a function of intermediate filaments?
(A) Chromosome movement during the cell division
(B) Cytoplasmic streaming
(C) Formation of tight junctions
(D) Anchorage of the nucleus

Functions of Intermediate Filaments in Cell Biology

Intermediate filaments provide mechanical strength and structural support within cells, distinguishing them from other cytoskeletal elements like microtubules and actin filaments. The correct answer to the query is (D) Anchorage of the nucleus, as nuclear lamins—a type of intermediate filament—form a meshwork that anchors and protects the nucleus.​

Correct Answer

Option (D) Anchorage of the nucleus is the primary function here. Intermediate filaments, especially lamins, line the inner nuclear envelope to stabilize the nucleus against mechanical stress and maintain its shape during cellular activities.​

Option Explanations

• (A) Chromosome movement during cell division: Microtubules of the mitotic spindle handle chromosome movement, not intermediate filaments, which lack motor proteins for this dynamic role.​

• (B) Cytoplasmic streaming: Actin filaments and myosin drive cytoplasmic streaming in plant cells, while intermediate filaments focus on static structural support.​

• (C) Formation of tight junctions: Tight junctions arise from membrane proteins like claudins and occludins; intermediate filaments aid cell cohesion but do not form these junctions.​

Cytoskeleton Comparison