In the form of proteins, amino acids comprise the second-largest component (water is the largest) of human muscles, cells and other tissues. Outside proteins, amino acids perform critical roles in processes such as neurotransmitter transport and biosynthesis.n biochemistry, amino acids having both the amine and the carboxylic acid groups attached to the first (alpha-) carbon atom have particular importance.
Ad lib redirects here. For other uses, see Ad lib (disambiguation). Ad libitum (/Ã¦dËlÉªbáµ»tÉm/) is Latin for at one's pleasure; it is often shortened to ad lib (as an adjective or adverb) or ad-lib (as a verb or noun).
Thumbs Up Sign. A thumbs up sign is used by humans to say everything is good. A fist with thumb pointing straight up towards the sky. A hand sign for approval or encouragement for a job well done.Nice work! The opposite (antonym) of a thumbs-down sign.humbs Up Sign. A thumbs up sign is used by humans to say everything is good. A fist with thumb pointing straight up towards the sky. A hand sign for approval or encouragement for a job well done. Nice work!