BIO 121- Lecture 2.docx - BIO 121 Lecture 2 20 aa are the...

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BIO 121 Lecture 2 20 aa are the building blocks for proteins o Has a central carbon atom, amino group, carboxyl group, side chain (defines the particular amino acid)- R group, then mostly a hydrogen Look at the chart on the slide, classify amino acids through R groups Nonpolar aa (R groups (usually hydrogen and carbon (hyrdro-carbons) o Ex: Glycine, alanine, valine, leucine,isoleucine,methionine, phenylalanine, tryptophan, proline o Proline the only exception of hydrocarbon R groups, it reloops Polar AA o Ex: serine, threonine, cysteine, tyrosine, asparagine, glutamine o *hydroxyl makes it polar* NH2 with C are not charged while they’re polar Electrically charged o O with c a O are always negatively charged (asparate) o Amine with an extra H are positively charged Try to memorize the abbreviations for amino acids it will help for later on Be able to identify which ones are negatively/positively charged Isomers Chiral (optical isomers)- two objects that are mirror images of each other, but they are not superimposable o Ex: hands
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