Chapter 13, Problem 13.1PS

Filaments and Tubules. Indicate whether each of the following descriptions is true of microtubules (MT), microfilaments (MF), or intermediate filaments (IF). More than one response may be appropriate for some statements.

(a) Involved in muscle contraction

(b) Involved in the movement of cilia and flagella

(c) More important for chromosome movements than for cytokinesis

(d) More important for cytokinesis than for chromosome movements in animal cells

(e) Most likely to remain when cells are treated with solutions of nonionic detergents or solutions of high ionic strength

(f) Structurally similar proteins are found in bacterial cells

(g) Their subunits can bind and catalyze hydrolysis of phosphonucleotides

(h) Can be detected by immunofluorescence microscopy

(i) Play well-documented roles in cell movement

(j) The fundamental repeating subunit is a dimer