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.
The introductory paragraph of any paper, long or short, should start with a sentence that piques the interest of your readers. In a well-constructed first paragraph, that first sentence will lead into three or four sentences that provide details about the subject or your process you will address in the body of your essay.