BIO206H5 Chapter Notes - Chapter 1: Exocytosis, Sexual Reproduction, Scanning Electron Microscope
Document Summary
Cells: small, membrane in closed units filled with a concentrated aqueous solution of chemicals and endowed with the ability to create copy of them. Paramecium: single celled, moves by beating cilia. Branched nerve cell, receives thousands of signals. Human white blood cells: approach and engulf red blood cells. Living cells have a similar basic chemistry. Cells are living things in the sense that they can grow reproduce and convert energy from one form to another. In all living things, genetic instructions-genes- are stored in dna molecules. Constructed out of same chemical building blocks. Dna polymer chain is made out of 4 monomers (nucleotides) Dna instructions are transcribed into set of polymers called rna. Serves as mrna: messages carried by this polymer chain are translated into protein. Protein: structural support, catalysts and molecular motors. Made from same set of 20 amino acids but different sequences giving diff 3-d shape or conformation. Contain genetic info in the form of dna or rna.
