(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell. see more on Definitions.net Â».
It forms a partition between the nasal passages and the mouth. On the anterior portion of the roof of the hard palate are the rugae, irregular ridges in the mucous membrane that help facilitate the movement of food backwards towards the pharynx.This partition is continued deeper into the mouth by a fleshy extension called the soft palate.he hard palate is a thin horizontal bony plate of the skull, located in the roof of the mouth.
The first section of the mouth is known as the oral cavity, or the mouth cavity. This space is bordered in the front and to the sides by the two alveolar arches, which contain the teeth. Toward the back it is bordered by the isthmus of the fauces. This entire structure is also called the mouth; the structures within the mouth allow us to taste and masticate (chew) food, to swallow food and drink, and to manipulate the air that comes up from the voice box so that we can form words.