The correct answer is: [C]: "constructing cell membranes" .
_______________________________________________________
Anura is the scientific name of the frog. Frog comes under the amphibia class, Chordata phylum, and Animalia kingdom.
Explanation:
Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. This R group, or side chain, gives each amino acid proteins specific characteristics, including size, polarity, and pH.