For cats, the main determinant of a food's palatability is its protein content. for cats, then, food tastes especially good when it activates ) receptors in the gustatory system.

Answer: umami

The umami taste receptors are activated by glutamate, which is found in proteins. Umami is one of the five basic tastes that describe food flavor.

Three Umami receptors - T1R1, T1R2 and T1R3 in the gustatory system activates the Umami and sweetness tastes. These receptors get binds to the molecules of food to produce taste. The Umami is the fifth taste apart from the tastes other than bitter, salts, sour and sweetness and its presence is linked to the amino acid i.e glutamate. It is not exact taste but is considered as taste due to its meatiness sensation and due to this reason a cat usually enjoys a non-veg food in the similar manner as the other kind of foods.

i'd say that the moon rock is about 2.2 billion years old.

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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