Final answer:
The vice president has responsibilities beyond just being prepared and shares constitutional duties.
Step-by-step explanation:
The statement that 'One word sums up the responsibility of any vice-president, and that word is 'to be prepared'' is not entirely accurate. While it is important for vice-presidents to be prepared, their role and responsibilities extend beyond just that. The vice president of the United States is the second-highest-ranking official in the country and has constitutional duties such as presiding over the Senate, casting tie-breaking votes, and being ready to assume the presidency in case of a vacancy or disability.