Therefore, the due date is generally calculated from the first day of the last menstrual period (LMP). In this case, 2 weeks are added to the calculation giving a total of 40 weeks (280 days). This is based on the assumption that ovulation/conception occurs on cycle day 14 in the âaverageâ 28 day menstrual cycle.
By Regina Bailey. Definition: The nucleus is a membrane bound structure that contains the cell's hereditary information and controls the cell's growth and reproduction.It is commonly the most prominent organelle in the cell.The nucleus is surrounded by a structure called the nuclear envelope.This membrane separates the contents of the nucleus from the cytoplasm. The cell's chromosomes are also housed within the nucleus.he nucleus is surrounded by a structure called the nuclear envelope. This membrane separates the contents of the nucleus from the cytoplasm. The cell's chromosomes are also housed within the nucleus.
noun. A model of an atom showing the nucleus. A model of an atom showing the nucleus. The nucleus is the center core of an atom that has a positive charge and that contains most of the atom's mass, or the central heart of an organization or group.1  An example of a nucleus is the center core of an atom. model of an atom showing the nucleus. A model of an atom showing the nucleus. The nucleus is the center core of an atom that has a positive charge and that contains most of the atom's mass, or the central heart of an organization or group. 1  An example of a nucleus is the center core of an atom.