Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 2

True or False. Identify each of the following statements as true (T)or false (F). Provide a brief justification for your answer.
(a)The minus end of microtubules and microfilaments is so named because subunits are lost and never added there.
(b)The energy required for tubulin and actin polymerization is provided by hydrolysis of a nucleoside triphosphate.
(c)Microtubules, microfilaments, and intermediate filaments all exist in a typical eukaryotic cell in dynamic equilibrium with a pool of subunit proteins.
(d)Latrunculin A treatment would block intracellular movements of Listeria.
(e)An algal cell contains neither tubulin nor actin.
(f)All of the protein subunits of intermediate filaments are encoded by genes in the same gene family.
(g)All microtubules within animal cells have their minus ends anchored at the centrosome.
(h)As long as actin monomers continue to be added to the plus end of a microfilament, the MF will continue to elongate.