•Breaking of Hydrogen and ionic bond 1) In which stages of protein structure are these bonds present ?
2) Why will this prevent the protein functioning?
3)What causes proteins to denature ?
4)Why do enzymes need the optimum temperature and pH?

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

How many major plates cover the earth

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures