Final answer:
The monomer units of animal proteins in wool, leather, and silk are linked by covalent bonds to form polymeric molecules. This is achieved through a dehydration synthesis process that creates peptide bonds between amino acids.
Step-by-step explanation:
The polymeric molecules and monomer units of animal proteins in wool, leather, and silk are connected by covalent bonds. Proteins, including those found in wool, leather, and silk, are natural polymers made up of amino acid monomers. These amino acids are linked together in a chain through a dehydration synthesis reaction, also known as a condensation reaction, where water is released as a byproduct. This forms a peptide bond, which is a specific type of covalent bond that binds the amino acid units in proteins.
To answer the separate question regarding monosaccharides and polysaccharides, monosaccharides link together to form polysaccharides by forming glycosidic bonds, which is another type of covalent bond.