BIOL 118 Midterm: EXAM 1 STUDY GUIDE
13 Feb 2017
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Intermediate filaments: not involved in movement, keratins provide structural support for the cell, lamins give nucleus its shape, microtubules, made of alpha and beta tubulin dimers, contribute to cell structure. Structure of amino acids: r groups can be polar, non-polar, or charged. Charged hydrophilic: amino acid r groups affect. Linking several amino acids together forms a polypeptide: a polypeptide is: Its r side chains extend out from the backbone: types of poly peptides. Oligopeptide/peptide less than 50 amino acids. Polypeptide more than 50 amino acids. Protein the complete, functional form of the molecule. A p(cid:396)otei(cid:374)"s u(cid:374)i(cid:395)ue se(cid:395)ue(cid:374)(cid:272)e of a(cid:373)i(cid:374)o a(cid:272)ids. Results from hydrogen bonding between the carboxyl oxygen of one amino acid residue and the amino hydrogen of another: hydrogen bonds are the bonds between atoms in the backbone, not the side chains. Polypeptide bends to allow hydrogen bonding resulting in one of two structures: alpha helix or, beta pleated sheet.
