How many different AMINO ACIDS are there that all living organisms use?Group of answer choices1220344664

How many amino acids are there?Group of answer choices4201,00010026

How many amino acids form the thousands of possible proteins?

12.Some amino acids are nonessential because

There are  3) ________ of amino acids needed to fulfill all of these functions, but only 4) _____of them are essentialGroup of answer choices20 types22 types21 types23 types

Amino acids are found attached to which of the following molecules?Group of answer choicesDNAmRNAtRNArRNAHelicase