Vinyl chloride, chloromethane and the banned pesticide DDT are examples of chlorinated hydrocarbons. Chlorinated hydrocarbons are organic molecules wherein chlorine has been substituted for some of...
Resident flora of certain areas plays a definite role in maintaining health and. normal function. Members of the resident flora in the intestinal tract synthesize. vitamin K and aid in the absorption of nutrients. On mucous membranes and. skin, the resident flora may prevent colonization by pathogens and possible. disease through âbacterial interference.â The mechanism of bacterial interference. is not clear.
The normal flora protect us from disease by. 1. Competing with invaders for space and nutrients. 2. Producing compounds (bacteriocins) which kill other bacteria. 3. Lowering the pH so that other bacteria can't grow. In addition to the above ways of protecting us from disease our normal flora help us in other ways.here are more bacteria living in or on our bodies, than we have cells of our own. A human body contains around 10 13 cells. The human body is home to around 10 14 bacteria. One fourth of fecal weight is made of bacteria! The normal flora are particularly important in the large intestine.