http://www.merlot.org:80/merlot/ A search of MERLOT materials Copyright 1997-2013 MERLOT. All rights reserved. Tue, 21 May 2013 21:09:53 PDT Tue, 21 May 2013 21:09:53 PDT http://www.merlot.org:80/merlot/images/merlot.gif http://www.merlot.org:80/merlot/ 44 34 http://www.merlot.org/merlot/viewMaterial.htm?id=648975 Gram positive has thick peptidoglycan layer 20-80nm and Gram negitie bacteria has a thin peptidoglycan layer 2-7nm. This video is good http://www.merlot.org/merlot/viewMaterial.htm?id=620552 Great dry labs to explain basic consepts of biology http://www.merlot.org/merlot/viewMaterial.htm?id=564813 Only the influenza Type-A virus is capable of what is known as antigenic shift. The current flu in circulation is an entirely new, mutated pathogen formed from elements of human, pig, and avian virus strains. Overflowing with mutated viruses, the respiratory epithelial host cells of the pig eventually burst open and circulate the new flu virus into the susceptible human population. http://www.merlot.org/merlot/viewMaterial.htm?id=639941 video on RNAi and its mechanisms