The Comptroller of Public Accounts, the Commissioner of the General Land Office, the Attorney General, and any statutory State officer who is elected by the electorate of Texas at large, unless a term of office is otherwise specifically provided in this Constitution, shall each hold office for the term of four years. Each shall receive an annual salary in an amount to be fixed by the Legislature and perform such duties as are or may be required by law. They and the Secretary of State shall not receive to their own use any fees, costs or perquisites of office. All fees that may be payable by law for any service performed by any officer specified in this section or in the officer’s office, shall be paid, when received, into the State Treasury.