Which protein that has 4 polypeptides ?

Hemoglobin if I'm correct

Hemoglobin

Explanation:

Hemoglobin is made up of four polypeptide chains, each of which has a different heme group. Four polypeptide chains make up haemoglobin.

When these subunits join together, they form the quaternary structure of the protein. Hemoglobin is an example of a protein with quaternary structure that we've already seen. Hemoglobin, as originally said, transports oxygen in the blood and is made up of four subunits, two makeup hemoglobin.

When Primary, secondary, tertiary, and quaternary structure are the differing stage two Makeup hemoglobin.

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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.

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