Ultimately, the fluid mosaic model is the best representation of the cell membrane as it shows that the phospholipids and proteins within the layers can do this.
Proteins are large biomolecules and macromolecules composed of one or more long chains of amino acid residues. Proteins perform a variety of functions in vivo, including catalyzing metabolic reactions, replicating DNA, responding to stimuli, giving structure to cells and organisms, and transporting molecules from one place to another. Proteins differ primarily in their amino acid sequences.
The amino acid sequence is determined by the nucleotide sequence of the gene, and normally the protein folds into a specific 3D structure that determines its activity.
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