Save guides, add subjects and pick up where you left off with your BBC account. A farmer sprays nitrate fertiliser on his land around a lake. Can you put these steps in order to describe how the ...

For most proteins, these two opposing processes are dynamically balanced during the cell cycle, holding each protein at a constant (steady state) level. For some proteins (for example, cyclins ...

A balanced carbon cycle is essential. Carbon is a major component in carbohydrates, fats and proteins. The carbon cycle involves the exchange of carbon between living organisms (biotic ...