That if you really like biology or chemestry, you will always be the villain or be in league with him/her.
If, on the other hand, you like mechanics or computers, you will find yourself in the employ of the hero fixing all the equipment he/she continually breaks or doing research for him/her.
If you do like biology or chemestry, your experiments will either a) try to take over/destroy the world or b) destroy you.