1) a) The mean division time for bacteria population A is 20 minutes. If the observation begins with one bacterium, calculate how many bacteria will be present after six hours. b) place the plate on a non-reflective surface. Take a ruler or caliper that measures in millimeters and place the "0" in the center of the antibiotic disk. Measure from the center of the disk to the edge of area with zero growth
2) An organism that causes a disease. Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two.
3) They produce anti-toxins, they make anti-bodies, they ingesr the bacteria.
4) Nose hairs and mucus, Acid in the stomach, The skin as a barrier, Mucus in the trachea and bronchi
5) They reproduce rapidly and destroy cells (virus) or produce poisons (bacteria)
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