Write the function of nucleus

ADVERTISEMENTS: In this essay we will discuss about:- 1. Definition of Nucleus 2. Number of Nucleus 3. Position 4. Shape 5. Biochemical Analysis 6. Structure 7. Functions. Contents: • Essay on the Definition of Nucleus • Essay on the Number of Nucleus • Essay on the Position of Nucleus • Essay on the Shape of Nucleus • Essay on the Biochemical Analysis of Nucleus • Essay on the Structure of Nucleus • Essay on the Functions of Nucleus Essay # 1. Definition of Nucleus: ADVERTISEMENTS: Nucleus (L. nucleus- kernel) is a specialized double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism and transmission to the posterity. A nucleus in the non-dividing or metabolic phase is called interphase nucleus. Like other cellular structures, living unstained nucleus does not show much internal differentiation. For detailed study of nucleus, the cells must be properly killed, fixed and stained. Nucleus is the largest cell organelle. Though first observed by Leeuwenhoek in red blood cor­puscles of fish, nucleus was first studied in orchid root cells by Robert Brown in 1831. A nucleus is present in all living eukaryotic cells with the excep­tion of mature sieve cells of vascular plants and red blood corpuscles of mammals. Even here a nucleus is present during the early stages of their development. Presence of hereditary information in the nucleus was proved by the work of Joachim Hammerling (1953) on single celled alga Acetabular...

Investigate varying electron configurations in electron shells around an atom's nucleus An ordinary, neutral atom has an equal number of protons (in the nucleus) and electrons (surrounding the nucleus). Thus the positive and negative charges are balanced.Some atoms, however, lose or gain electrons in chemicalreactions or in collisions with other particles. Ordinary atoms that either gain or lose electrons are called More than 90 types of atoms exist in nature, and each kind of atom forms a different Facts You Should Know: The Periodic Table Quiz This article opens with a broad overview of the fundamental properties of the atom and its Most matter consists of an agglomeration of molecules, which can be separated relatively easily. Molecules, in turn, are composed of atoms joined by chemical bonds that are more difficult to break. Each individual atom consists of smaller particles—namely, electrons and nuclei. These particles are electrically charged, and the electric forces on the charge are responsible for holding the atom together. Attempts to separate these smaller constituent particles require ever-increasing amounts of Get a Britannica Premium subscription and gain access to exclusive content. As noted in the introduction to this article, an atom consists largely of empty space. The nucleus is the positively charged centre of an atom and contains most of its All atoms are roughly the same size, whether they have 3 or 90 electrons. Approximately 50 million atoms of −10 ...

The Golgi apparatus, also called Golgi complex or Golgi body, is a membrane-bound The Golgi apparatus is responsible for transporting, modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations. As the secretory proteins move through the Golgi apparatus, a number of chemical modifications may transpire. Important among these is the modification of carbohydrate groups. Also within the Golgi or secretory vesicles are The Golgi apparatus was observed in 1897 by Italian cytologist reazione nera, meaning “black reaction”; today it is known as the Golgi stain. In this technique, nervous tissue is fixed with potassium dichromate and then suffused with silver nitrate. While examining neurons that he stained by using his black reaction, Golgi identified an “internal reticular apparatus.” This structure became known as the Golgi apparatus, though some scientists questioned whether the structure was real and attributed the find to free-floating particles of Golgi’s metal stain. In the 1950s, however, when the In general, the Golgi apparatus is made up of approximately four to eight cisternae, although in some single-celled organisms it may consist of as many as 60 cisternae. The cisternae are held together by matrix proteins, and the whole of the Golgi apparatus is supported by cytoplasmic microtubules. The apparatus has three primary compartments, known generally as “cis,” “medial,” and “trans.” The cis Golgi network and the trans Golgi network,...

Nuclear Membrane Nuclear Membrane Definition “Nuclear membrane is a double-layered membrane that separates the contents of the nucleus from the rest of the cell.” What is the Nuclear Membrane? All the eukaryotic cells that are found in plants, animals, fungi, and protists have a control centre, called a nucleus where DNA is stored. Every nucleus is girdled and covered by a double-layered membrane, known as the nuclear envelope or nuclear membrane. It separates the nucleoplasm (the fluid present in the nucleus), from the  cytoplasm . The nuclear envelope is also called nuclear membrane. It is made up of two lipid bilayer membranes The nuclear membrane is present in both the plant and animal cells. Cells carry out a multitude of functions such as protein building, conversion of molecules into energy and elimination of unnecessary products. This membrane guards the genetic material of the cells against the exterior of the nucleus where chemical reactions are taking place. Also, it carries several proteins which are crucial in the organization of DNA  and to control genes. Nuclear Membrane Structure A nuclear membrane is composed up of two membranes – an inner and an outer membrane. Both membranes consist of phospholipids that are organized in a bilayer. The complete nuclear membrane includes four series of phospholipids. The perinuclear space separates the outer and inner membrane. The outer membrane works by the rough endoplasmic reticulum. It is an organelle which is impo...

https://med.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fmed.libretexts.org%2FBookshelves%2FAnatomy_and_Physiology%2FHuman_Anatomy_and_Physiology_Preparatory_Course_(Liachovitzky)%2F04%253A_Smallest_Level_of_Complexity_Alive-_Cells_Their_Structures_and_Functions%2F4.01%253A_Cell_Structure_and_Function \( \newcommand\) No headers Learning ObjectiveS • Define a cell, identify the main common components of human cells, and differentiate between intracellular fluid and extracellular fluid • Describe the structure and functions of the plasma (cell) membrane • Describe the nucleus and its function • Identify the structure and function of cytoplasmic organelles A cell is the smallest living thing in the human organism, and all living structures in the human body are made of cells. There are hundreds of different types of cells in the human body, which vary in shape (e.g. round, flat, long and thin, short and thick) and size (e.g. small granule cells of the cerebellum in the brain (4 micrometers), up to the huge oocytes (eggs) produced in the female reproductive organs (100 micrometers) and function. However, all cells have three main parts, the plasma membrane, the cytoplasm and the nucleus. The plasma membrane (often called the cell membrane) is a thin flexible barrier that separates the inside of the cell from the environment outside the cell and regulates what can pass in and out of the cell. Internally, the cell is divided into the cytoplasm and the nucleus. The cy...

On the left is a circle representing an animal cell. The cell contains many cell parts with different shapes. A small bean-shaped cell part is labeled mitochondrion. A medium-sized circular cell part that has squiggly lines inside is labeled nucleus. The outermost part of the cell, which is shown as an outline of the cell, is labeled cell membrane. On the right is a four-sided figure with rounded corners that represents a plant cell. The cell contains many cell parts with different shapes. A small green oval with stacks of darker green ovals inside is labeled chloroplast. A medium-sized circle that has squiggly lines inside is labeled nucleus. The outermost part of the cell, which is shown as a thick outline of the figure, is labeled cell wall. A thinner layer just inside the cell wall is labeled cell membrane. A small bean-shaped cell part is labeled mitochondrion. Actually, you are partially wrong. Plant cells do indeed have chloroplasts while animal cells do not, but both types of cells have mitochondria. Animal cells have structures called lysosomes (which are basically organelles containing an extremely acidic fluid to break down objects) and centrosomes (used in cell reproduction). Plant cells have neither of these. Plant cells have cell walls that surround their cell membrane, and large central vacuoles that make the cell rigid. Animal cells have neither of these structures. Additionally, animal cells usually have an irregular shape, while plant cells are more recta...