Item 10 Which example is a way that intercellular communication occurs?

A signal is translated into action for a muscle cell to contract.

A signal is sent down an exon within a nerve cell.

A molecule is transmitted from one part of a cell to another to cause a response.

A molecule is sent through the plasmodesmata of a plant cell.

Answer is A signal is sent down an exon within a nerve cell.

Explanation:

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.

true is the