What is the highest level of protein structure in human insulin, which has two polypeptides of different mass linked by several disulfide bonds?.

As you watch a surfer ride a wave towards the shoreline, what is the shoreline? a) displacement reference b) reference point c) coordinate plane d) cartesian boundary

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.