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
to flee or hide
a nonspecific immune response

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Cell Structure and Compartments
According to the fluid mosaic model of cell membranes,

the membrane is a highly mobile mixture of phospholipids and proteins
basic membrane structure results from how the proteins interact with water
the unique properties of cell types are determined by their phospholipids
the most common type of molecules in the membrane are proteins

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Cell Structure and Compartments
Eukaryotic cells are more efficient than prokaryotes because their internal compartmentalization

allows for specialization through merging of different tasks
allows for specialization through the subdivision of particular tasks
makes each compartment nutritionally independent of all others
reduces overall cell size

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