Phenylalanine, tyrosine, tryptophan. Aliphatic amino acids: These are ones which have aliphatic groups like -CH2- in between carboxylic and amine moiety. They are the ones excluding aromatic amino acids from the above list of both essential and non-essential ones.
What is a paragraph? A paragraph is a collection of related sentences dealing with a single topic. Learning to write good paragraphs will help you as a writer stay on track during your drafting and revision stages. Good paragraphing also greatly assists your readers in following a piece of writing.
Princeton's WordNet(2.00 / 1 vote)Rate this definition: 1  beginning(noun) the event consisting of the start of something. the beginning of the war. 2  beginning, commencement, first, outset, get-go, start, kickoff, starting time, showtime, offset(noun) the time at which something is supposed to begin.