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
a nonspecific immune response
its body wall
to flee or hide

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

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

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