No. The completion of an associate degree is not a requirement for transfer to a UC. However, you are encouraged to complete the IGETC requirements and any prerequisites in the major required at the UC you will be transferring to. Completing both of these requirements will almost satisfy the requirements for the associate degree.
When completing your general education requirements, if transferring to a UC you must complete IGETC. CSU transfer students can complete either IGETC or the CSU GE Breadth requirements. The minimum GPA requirements are higher for the UCs (2.8) then they are for a CSU campus (2.0).
Sometimes, depending on the budget. Please check with the Transfer Center coordinator/counselor if any trips are being scheduled. Also, certain campus programs arrange visitations for their students, so if you are a member of a program on campus, check with your advisor.