1 Transformation: bacteria simply absorb, across their cell membrane and cell wall, DNA that is floating around in the environment. 2  Conjugation: bacteria directly transfer DNA from one bacterium to another through structures called pilli. Transformation: bacteria simply absorb, across their cell membrane and cell wall, DNA that is floating around in the environment. 2  Conjugation: bacteria directly transfer DNA from one bacterium to another through structures called pilli.
Food begins its journey through the digestive system in the mouth, before being pushed by a series of involuntary muscle contractions through the esophagus, then the stomach, and then the small and large intestines.
Liver produces bile which is necessary for food digestion in the small intestine. Gallbladder. The gallbladder stores the bile produced by the liver. When food enters the digestive tract, bile is released into the small intestine from the gallbladder.Pancreas. Pancreas is another gland that helps in the digestion of food.hewing prepares the food for travelling through the digestive tract. This is the first mechanical process that the food undergoes once it enters the body. During chewing, the food is mixed with saliva produced by the salivary glands.