Which of the following are grouped correctly according to pH?                    

Why is cholesterol important?                   

Atoms form elements.  How are elements different from one another?                   

Complex carbohydrates                  

Scientists have been classifying living things since Aristotle (384-322BC). The current most inclusive  category of living things is                    

____________ allow(s) diffusion of ions or large molecules across the cell membrane into the cell?

The Second Law of Thermodynamics says

How do enzymes affect biochemical reactions in the cell?

Atoms form different kinds of bonds within molecules. Match the molecule with the type of bond within the molecule.                  

ATP is the energy currency of the cell.