Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

تمرين 4

From chapter 6, figure 6.22. What has happened to the bacterial DNA in this illustration What effect can this have on a bacterium Is this temporary or permanent

chapter 6, figure 6.22.

Cultivating animal viruses in a developing bird embryo. (a) A technician inoculates fertilized chicken eggs with viruses in the first stage of preparing vaccines. Current influenza vaccine is prepared this way. (b) The shell is perforated using sterile techniques, and a virus preparation is injected into a site selected to grow the viruses. Targets include the allantoic cavity, a fluid-filled sac that functions in embryonic waste removal; the amniotic cavity, a sac that cushions and protects the embryo itself; the chorioallantoic membrane, which functions in embryonic gas exchange; the yolk sac, a membrane that mobilizes yolk for the nourishment of the embryo; and the embryo itself.