Why are enzymes so important?
because they act as a catalyst in the chemical reactions necessary for life within organisms.
because they cause decomposition reactions.
because they are the building blocks of proteins.
because they are the building blocks of dna and rna.

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer