The two functional groups which are always found in amino acids are carboxyl and amino groups and is denoted as option B.
These are substances which are derived from protein is broken down through series of enzymatic actions and are the building blocks of life as they are responsible for the growth and repair of worn out tissues.
They contain elements such as nitrogen, carbon, hydrogen etc and their structure is made up of a basic amino group (―NH2) and an acidic carboxyl group (―COOH).
This is therefore the reason why option B was chosen as the most appropriate choice.
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