The nucleus is considered to be one of the most important structures of eukaryotic cells as it serves the function of information storage, retrieval and duplication of genetic information. It is a double membrane‐bound organelle that harbours the genetic material in the form of chromatin.

The nucleus consists of the following main parts: (1) Nucleolemma or nuclear membrane (karyotheca) (2) Nuclear sap or karyolymph or nucleoplasm (3) Chromatin network or fibres (4) Nucleolus (5) Endosomes.

The Nucleolus It is the site of transcription of the genes for rRNA molecules, for which there are 400 genes in a diploid human cell, distributed in multiple tandem repeats on 5 different chromosomes. The RNA and protein components of the enzyme telomerase are also assembled in the nucleolus.

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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. An example of a nucleus is the center core of an atom.

Shape and appearance Mostly the shape of the nucleus is spherical or oblong. Usually cells have one nucleus but many at times there are multinucleated cells. Multinucleation in cells may be due to karyokinesis (when cell undergoes nuclear division) or when cells fuse to form syncytium, like in mature muscle cells.

The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell’s genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.

The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.

RNA/DNA can leave the nucleus. mRNA is made during transcription/translation. mRNA is made in the cytoplasm/nucleus.

The nucleus is located toward the center of the cell because it controls all of the cell’s movements, the cell’s feeding schedule and the cell’s reproduction. Its central location enables it to reach all parts of the cell easily.

Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages.

The Nucleus contains the genetic material, also known as DNA, which is responsible for controlling and directing all the activities of the cell. All the RNA’s needed for the cell are synthesized in the nucleus.

The nucleus is an organelle that contains the genetic information for that organism. In an animal cell, the nucleus is located in the central region of the cell. In a plant cell, the nucleus is located more on the periphery due to the large water-filled vacuole in the center of the cell.

An analogy for the nucleus is that the nucleus is like the boss of a factory. The nucleus contains the DNA of the cell, and the DNA holds all of the…

Robert Brown

Animal cells Animals are made up of millions of cells. Animal cells have an irregular structure and are made up of four key parts: Nucleus – This contains genetic material (DNA), and controls the cell’s activity. Cell membrane – A flexible layer that surrounds the cell and controls the substances that enter and exit.

Structurally, plant and animal cells are very similar because they are both eukaryotic cells. They both contain membrane-bound organelles such as the nucleus, mitochondria, endoplasmic reticulum, golgi apparatus, lysosomes, and peroxisomes.

Prokaryotes are single-celled organisms belonging to the domains Bacteria and Archaea. Prokaryotic cells are much smaller than eukaryotic cells, have no nucleus, and lack organelles. All prokaryotic cells are encased by a cell wall.

There are 13 main parts of an animal cell: cell membrane, nucleus, nucleolus, nuclear membrane, cytoplasm, endoplasmic reticulum, Golgi apparatus, ribosomes, mitochondria, centrioles, cytoskeleton, vacuoles, and vesicles.

Terms in this set (14)

• Cell Membrane. Semipermeable, controls what goes into & out of the cell.
• Nucleus. Controls cell activities, involved with reproduction & protein synthesis.
• Cytoplasm.
• Nuclear Membrane.
• Nucleoplasm.
• Nucleolus.
• Endoplasmic Reticulum (ER)
• Ribosomes.

Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Specialized cells that formed nerves and muscles—tissues impossible for plants to evolve—gave these organisms mobility.

Terms in this set (9)

• Nucleus. Part of the cell that controls activities of other cell parts.
• Chromosomes. Stringlike structure in a cell nucleus that carries information controlling all the cell’s activities.
• Cell membrane.
• Cytoplasm.
• Organelle.
• Mitochondria.
• Vacuoles.
• Endoplasmic Reticulum.

A cell is like a car. The nucleus of a cell would be like the driver of a car, they control the cell/car. Cell membrane is like the doors on a car. It gives the motor energy so it can run like the mitochondrion produces energy for the cell.

A typical animal cell comprises the following cell organelles:

• Cell Membrane. A thin semipermeable membrane layer of protein and fats surrounding the cell.
• Nuclear Membrane. It is a double-membrane structure that surrounds the nucleus.
• Nucleus.
• Centrosome.
• Lysosome (Cell Vesicles)
• Cytoplasm.
• Golgi Apparatus.
• Mitochondrion.

Terms in this set (14)

• Cell Wall (Plant) Surrounds the cell membrane and provides rigid structure.
• Cell Membrane (Plant/Animal)
• Cytoplasm (Plant/Animal)
• Cytoskeleton (Plant/Animal)
• Mitochondria (Plant/Animal)
• Golgi body (Plant/Animal )
• Endoplasmic reticulum (ER) (Plant/Animal)
• Ribosomes (Plant/Animal)

A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of miniscule but distinct structures called organelles.

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells have many parts, each with a different function.