Cell Structure and Compartments
An organism's first line of defense against attack by an invader such as a virus or bacterium is usually

a specific immune response
its body wall
a nonspecific immune response
to flee or hide

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Cell Structure and Compartments
Microtubules, motor proteins, and actin filaments are all part of

the cytoskeleton of eukaryotic cells
the mechanism of photosynthesis that occurs in chloroplasts
the rough ER (endoplasmic reticulum) in prokaryotic cells
the process that moves small molecules across cell membranes

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Cell Structure and Compartments
The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts

help the cell against physical damage
increase the surface area where key chemical processes can occur
assist with cell movement
make it possible to package large amounts of DNA within the cell

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