1. Many aquatic invertebrates, like fishing spiders and water striders, can walk on the surface of water. How are they able to do this, and why can't we?
2. The shape of a protein is often very important to how it works. For example, on the surface of some human immune system cells is a type of protein called an HLA. HLAs help the immune system recognize foreign invaders (cells and particles from outside the body) by binding to them using a tiny pair of molecular 'jaws'. What do you think would happen if a person had a mutation that prevented the jaw part of their HLA molecules from becoming the correct shape?