BIOLOGY 1A03 Lecture Notes - Lecture 3: Cell Membrane, Peptide, Nuclear Pore

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Rosada Silva

Document Summary

Nucleus: surrounded by double nuclear membrane enclosing chromosomes, contains nucleolus; rrna molecules are transcribed here, nuclear pore complexes allow the transcribed rna to exit the nucleus for further processing (in nuclear regions) Ribosomes: involved in synthesis of proteins, can remain soluble in the cytoplasm as free ribosomes or attach to the er to become bound ribosomes, the condensation reaction that joins aa are catalyzed within the ribosome. During translation, aa polymerize to form the primary structure of a protein when bonds form between the carboxyl group and amino groups of 2 aa. 3d shapes of proteins are critical to their functions: globular proteins (cytosol) hydrophilic exterior, hydrophobic core. Protein"s primary structure (aa) determines subsequent structures: secondary structure 1: alpha helix. Polymer is turned into a spiral by the formation of h bonds. Form between carbonyl of carboxyl and the amide of another residue: secondary structure 2: beta pleated sheets.