Globular proteins: compact, water soluble, and usually roughly spherical in shape, form when proteins fold into their tertiary structures in such a way that the hydrophobic R-groups on the amino acids are kept away from the aqueous environment, hydrophilic R-groups are on the outside of the protein, proteins are soluble in water, insulin, haemoglobin, catalase, Fibrous proteins: formed from long, insoluble molecules, high proportion of amino acids with hydrophobic R-groups in their primary structures, contain a limited range of amino acids, usually with small R-groups, amino acid sequence in the primary structure is usually quite repetitive, makes strong, long molecules which are not folded into complex 3D shapes, keratin, elastin, collagen,

Comparing globular proteins and fibrous proteins.

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