Why transistor is so called?

Explain structure of Insulin. How insulin is synthesised in human (or mammals)? Why is proinsulin so called? How is insulin different from it?

Why stationary wave is so called?

Why are transgenic animals so called?

Why is nylon -66 so called ?

How are 'Sticky ends' formed on a DNA strand? Why are these so called?

Explain , why the input resistance of a transistor is low and output resistance is high.

name a uricotelic animal.Why is it so called?How is this mode of excretion advantageous to the animal.