Complete the following sentences about enzyme function: enzymes speed reaction rates by and lowering activation energy. activation energies drop because enzymes stabilize enzyme specificity is a function of the active site's shape and the chemical properties of at the active site.

The correct answer will be-

1. Orienting substrates

2. Transition state

3. R groups

Explanation:

Enzymes are the biological chemicals which increase the speed of a chemical reaction taking place in a cell.

The enzymes are the folded or tertiary structures of the proteins which act on the substrate molecule by either attaching it directly to its active site or inducing or orienting the structure of the substrate. This forms a transitory or intermediate structure which lowers the activation energy of the chemical reaction and thus speeds up the chemical reaction.

The enzymes are highly specific to their substrate due to their different R groups in their amino acid structure.

Thus, Orienting substrates, Transition state and R groups is the correct answer.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.