Final answer:
The term for the clause in a mortgage that requires the note to be due in full upon the sale or transfer of a property is due-on-sale clause.
Step-by-step explanation:
The term for the clause in a mortgage that requires the note to be due in full upon the sale or transfer of a property is due-on-sale clause. This clause allows the lender to demand the full repayment of the loan if the property is sold or transferred. It helps protect the lender's interests and ensures that they have the opportunity to approve the new property owner before continuing the loan.