What is the electron configuration for iron?

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction

In which reaction is precipitation occurring?

Can someone me with 3 and 4 plz. this is for masteries test.