Use the Following to Answer the Following Questions -The Cell Walls of Bacteria, Fungi, and Plant Cells and Are

question 25

Multiple Choice

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}$

-The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is a characteristic of all of these extracellular structures?

• A)They must block water and small molecules in order to regulate the exchange of matter and energy with their environment.
• B)They must permit information transfer between the cell's cytoplasm and the nucleus.
• C)They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume.
• D)They are constructed of materials that are largely synthesized in the cytoplasm and then transported out of the cell.
• E)They are composed of a mixture of lipids and carbohydrates.

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