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.
You should start a new paragraph when: 1  When you begin a new idea or point. New ideas should always start in new paragraphs. 2  To contrast information or ideas. Separate paragraphs can serve to contrast sides in a debate, different points in an argument, or any other difference. 3  When your readers need a pause.