The test may cause momentary gagging because the back of the throat is a sensitive area, but it should not be painful. The sample your doctor collects is taken to a laboratory, where it is put on a plate that allows any bacteria on it to grow. This process is called a culture.
Often these are called transition zones which represent the start and end of a specific region and can be large or small. For example, the transition zone between Sub-Saharan Africa and North Africa is rather large because there is a mixing between the two regions. Regional geographers study this zone as well as the distinct characteristics of Sub-Saharan Africa and North Africa.
1 The African Transition Zone creates the southern boundary for North Africa. 2  This zone serves as the transition between the arid type B climates and the tropical type A climates. 3  It is also the transition between the dominance of Islam and the dominance of Christianity and animism.