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

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

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
the membrane is a highly mobile mixture of phospholipids and proteins

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