13-1 Filaments and Tubules. Indicate whether each of the fol- lowing description

Question

13-1 Filaments and Tubules. Indicate whether each of the fol- lowing descriptions is true of microtubules (MT), microfilaments (MF), or intermediate filaments (IF). More than one response may be appropriate for some statements. (a) Inhibited by the chemical agent taxol (b) Are arranged in a spindle shape during cell division (c) Also associated with fibrils of myosin (d) More likely to be found in the axons of nerve cells (e) Have diameters that range from 8-12 nm (f) Structurally similar proteins are found in bacteriai cells (g) Their subunits can bind and catalyze hydrolysis of phosphonu- cleotides (h) Can be detected by immunofluorescence microscopy (i) Play well-documented roles in cell movement (G) The fundamental repeating subunit is a dimer

Explanation / Answer

a) taxol inhibit only microtubules

b) only microtubules take part in spindle formation during cell division

c) microfilaments are associated with myosin

d) neurofilamens are made up of both microtubules and microfilaments

e) intermediate filaments

f) microtubules, micofilaments, IF

g) microfilaments and microtubules

h) all three

i) microtubules and microfilaments

j) microtubules

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