Drag each tile to the correct box. Arrange these steps in the nitrogen cycle in the correct order to explain how nitrogen from the atmosphere cycles through the other spheres on Earth. biosphere, dead organic mater, nitrogen fixation, denitrification, ammonification, nitrification yielding nitrate, nitrification – yielding nitrite

1) dead organic matter

2) ammonification

3) nitrification – yielding nitrite

4) nitrification yielding nitrate

5) denitrification  

6) biosphere

7) Fixation

Explanation:

The atmosphere is the principal reservoir of nitrogen. There are few organisms, such as bacteria, capable of fixating it. To the moment, no eukaryotic organisms have been found to fixate nitrogen.  

There are three principal stages in the nitrogen cycle:

- ammonification: the process by which nitrogenated components found in the soil, product of decomposition of organic matter, are degraded to simpler components by bacteria and fungus. These microorganisms metabolize these compounds and release the excess of nitrogen as ammoniac NH3 or ammonia NH4. Basically, ammonification is the nitrogen conversion from the amino or imino groups (as it is found in organic matter), to ammonia.  

- nitrification: The process by which many bacteria in the soil are capable to oxidate the ammoniac or the ammonia. This is an energy generator process. The energy released is used by these bacteria as a primary source of energy. A group of bacteria oxidates the ammoniac or ammonia to nitrite and another group of bacteria oxidates nitrite to nitrate. Nitrification results from the sequential action of these two groups.

the combination os ammonification and nitrification gives a new form of nitrogen that is assimilable by plants.

- assimilation: The process by which plants take nitrogen from the soil and put it into circulation in the trophic chain.

When plants and animals die, their tissues are processed by microorganisms that give nitrogen back to the soil. And so the cycle starts all over again.

CYCLE:

i would go with b

cytokinesis occurs after telophase so that eliminates d

and the entire reason for cytokinesis is for cellular reproduction

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products