Examlex
Covalent linkage to what highly-conserved molecule marks proteins for destruction?
Urea
An organic compound and waste product produced in the liver, resulting from the metabolism of proteins, excreted in the urine.
Amphibians
A class of cold-blooded vertebrates that includes frogs, toads, salamanders, and newts, characterized by their ability to live both in water and on land.
Mammals
Warm-blooded vertebrates characterized by the presence of mammary glands, which females use to feed their young, and usually hair or fur on their bodies.
Aquatic Animals
Animals that live in water for most or all of their lives, including fish, amphibians, and various invertebrates, adapted to their liquid environment in various ways.
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