二、問答題(共50分)※注意:請於試卷内之非選擇題作答區」作答,並應註明作答之題號。 1. Please describe the procedure for producing monoclonal antibodies. (10分)

4. In animals, the cell cycle is controlled by a molecular control system which involves cyclic changes of regulatory proteins. As well, it is regulated at certain checkpoints (G1, G2, and M) by both internal and exterrnal signals. Please describe in details exactly how is the cell cycle regulated? (9 points)