BCH 261 Chapter Notes - Chapter 5: Sulfur, Asparagine, Electromagnetic Spectrum
6 Mar 2018
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Dna polymerase (in dna replication: transport. Lactose permease (transports lactose across the cell membrane: structure. E(cid:454)a(cid:373)ples of protei(cid:374) fu(cid:374)ctio(cid:374) a(cid:374)d structure that (cid:455)ou ca(cid:374) (cid:862)see(cid:863): fireflies express the protein luciferin, red blood cells express the protein hemoglobin, rhinoceros horns are made of the protein keratin proteins are polymers of amino acids: The carboxyl and amino groups can act as an acid or base. Amphoteric- refers to when a molecule can be a base or an acid simultaneously. At physiological ph (7. 2) the carboxyl group on the amino acid donates h+ (acid) while the amino group accepts an h+ (base) The ionization state of amino acids is altered by a change in ph. The zwitterionic form predominates near physiological ph (7. 2) At acidic ph, the carboxyl group is protonated and the amino acid is in the cationic form. At neutral ph, the carboxyl group is deprotonated but the amino group is protonated (zwitterion is formed)
