Which of following defines what an essential amino acid is? OA.
An essential amino acid means that the body needs it to perform properly, but non-essential amino acids are not needed to
perform properly.
An essential amino acid is an amino acid that the body can produce its self.
OB.
O C.
An essential amino acid is an amino acid that the person can only get from the food he eats.
D.
All of the above

C

Explanation:

essential amino acids cannot be synthesized within the human body . so they have to be taken outside from foods. ( in human)

but non essential amino acids are synthesized in the liver using essential amino acids.

person has to obtain first class proteins such as meat , egg , soya protein in order to get essential amino acids.

but plants synthesize both essential and non essential amino acids within their bodies.

a person needs both essential and nonessential amino acid for his/her function

hope you understood this part :p

your answer is "the 1950's"

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).