Biological Psychology Coursework HELP!

Can anybody help me with these questions for my biological psychology coursework. I'm in my first year at Uni studying psychology and i'm struggling the most with this topic!

Each answer has to be below 250 words.

Any help is greatly appreciated! Thanks!

1) Explain one of the methods used in biopsychological research using an
example.

2) Describe the main roles of the frontal lobe.

3) Describe the incentive sensitization theory of addiction.

4) Briefly explain the biological bases of mood disorders.

5) Outline the role metal ions play in the initiation and transmission of an
impulse along a neuron and across a synapse.

6) By testing twins reared apart we can end the nature vs. nurture debate.
Discuss.