Use the following to answer the following questions. All three are involved in maintenance of cell shape.

\begin{array}{c}\begin{array}{|l}\hline\\ \text {Property}\\\hline\\\\ \text {Structure}\\\hline\\ \text {Diameter}\\\hline \text {Main}\\\text {functions}\\\hline \end{array}\begin{array}{|l|}\hline \text { Microtubules (tubulin}\\\text { polymers)}\\\hline \text {Hollow tubes; wall}\\ \text {consists of 13 columns}\\ \text {of tubulin molecules}\\\hline \text {\( 25 \mathrm{~nm} \) with 15-nm}\\ \text {lumen}\\\hline\\ \text {Cell motility}\\\hline \end{array}\begin{array}{l|}\hline \text { Microfilaments (actin}\\ \text { filaments)}\\\hline \text { Two intertwined strands}\\ \text { of actin, each a polymer }\\ \text { of actin subunits}\\\hline\\ \text { \( 7 \mathrm{~nm} \)}\\\hline\\ \text { Cell motility}\\\hline \end{array}\begin{array}{l|}\hline \text {Intermediate}\\ \text {filaments}\\\hline \text {Fibrous proteins }\\ \text {supercoiled into}\\ \text { thicker cables}\\\hline\\ \text {8-12nm}\\\hline\\ \text {Anchorage}\\\hline\end{array}\end{array}

-Use the following to answer the following questions. All three are involved in maintenance of cell shape. (K?)moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the ion?
A)plasma membrane ? primary cell wall ? cytoplasm ? tonoplast
B)secondary cell wall ? plasma membrane ? primary cell wall ? cytoplasm ? tonoplast
C)primary cell wall ? plasma membrane ? cytoplasm ? tonoplast
D)primary cell wall ? plasma membrane ? tonoplast ? cytoplasm ? vacuole
E)tonoplast ? primary cell wall ? plasma membrane ? cytoplasm

A Mycoplasma Is an Organism with a Diameter Between 0

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