Final answer:
A signal sequence is a short tail of amino acids that directs a protein to a specific cellular compartment, while patches refer to non-contiguous stretches of amino acids that have specific functions within the protein.
Step-by-step explanation:
A signal sequence is a short tail of amino acids that directs a protein to a specific cellular compartment. It can be located at the amino end or the carboxyl end of the protein and acts as a protein's 'train ticket' to its ultimate destination. On the other hand, patches refer to non-contiguous stretches of amino acids that have specific functions within the protein.