You dont want to risk missing 2-3 questions because of something you could had memorized in 30 minutes. It is part of the most basic knowledge about protein chemistry, and it doesnt take much time to memorize. Shown at the right is the structure of serine. You should DEFINITELY memorize the amino acids. These amino acids are usually found at the surface of proteins, as discussed in the Proteins 2 module. These are serine (Ser), threonine (Thr), cysteine (Cys), asparagine (Asn), glutamine (Gln), and tyrosine (Tyr). Glycine, Gly, G - glycine glad to be seen on a test. Six amino acids have side chains that are polarīut not charged. Here are some silly mnemonics to help remember some of the amino acids or their one letter abbreviations. This fact has important implications for proteins' tertiary structure (see the Proteins 2 module for a discussion of tertiary structure). These side chains are composed mostly of carbon and hydrogen, have very small dipole moments, and tend to be repelled from water. If you think back to your introductory biochemistry class, you probably remember some of. Shown at the right is the structure of valine. As a topic on the MCAT, amino acids are incredibly high yield. Side chains are glycine (Gly), alanine (Ala), valine (Val), leucine (Leu), isoleucine (Ile), proline (Pro), phenylalanine (Phe), methionine (Met), and tryptophan (Trp). An amino acid has the general formula in which a central carbon atom is attached with a hydrogen atom, a carboxyl group, an amine group and a side group (R group). Also learned a fairly easy way to remember the pKas: ST RocKY CHED. I would just keep rewriting them several times a day for a week and it eventually cements.
First acidic, then basic, then hydrophobic, etc. To visualize the amino acid groups, picture a pizza with four toppings, and a little support table in the middle thats there to keep the cheese from sticking to the lid. Hence, the hydrophobic nature of these compounds arises due to the side chains they have in their chemical structure. in the princeton book it groups the amino acids by their properties, so i just went category by category.
Thus we remember: In a chemical that has one acidic and one basic group. The nine amino acids that have hydrophobic The chemical properties of amino acids are largely determined by one group of molecules, whats known as the R group: a side chain that differs on each amino acid. With the exception of glycine, all amino acids are chiral usually the L-form. Amino acids are grouped according to what their side chains are like.
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