Amino acids are not excreted intact. rather:

the nitrogen-containing amino group is recycled while the remainder of the molecule is excreted in the urine.

the nitrogen-containing amino group is removed and converted to urea, which is excreted in the urine.

the carboxylic acid group is removed, neutralized by the bile, and excreted in the feces.

the side-chain group is removed and excreted while the remainder of the molecule is recycled.

The nitrogen containing amino group is recycled while the remainder of the molecule is excreted in the urine

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there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: