A nucleus is
a membrane-bound organelle that contains the cell’s chromosomes
. Pores in the nuclear membrane allow for the passage of molecules in and out of the nucleus.
What does nuclei stand for?
Nucleus (plural nuclei) is a Latin word for the seed inside a fruit. It most often refers to:
Atomic nucleus
, the very dense central region of an atom. Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell’s DNA.
What is meant by nuclei in biology?
A nucleus is
a membrane-bound organelle that contains the cell’s chromosomes
. Pores in the nuclear membrane allow for the passage of molecules in and out of the nucleus.
What is the nuclei of a cell?
The
nucleus controls and regulates the activities of the cell
(e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus. The gel-like matrix in which the nuclear components are suspended is the nucleoplasm.
What are nuclei examples?
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
. … The nucleus of a city.
Why is it called nucleus?
The term nucleus
came from the Latin nucleus, meaning “kernel” or “core”
, a diminutive of nux (“nut”). The plural form is nuclei. Nuclear is the descriptive term that relates to a nucleus.
What is a nucleus simple definition?
1 :
a usually round part of most cells that is enclosed in a double membrane, controls the activities of the cell
, and contains the chromosomes. 2 : the central part of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons.
What are brain nuclei?
In neuroanatomy, a nucleus (plural form: nuclei) is
a cluster of neurons in the central nervous system
, located deep within the cerebral hemispheres and brainstem. … A nucleus may itself have a complex internal structure, with multiple types of neurons arranged in clumps (subnuclei) or layers.
Who named nucleus?
Answer: In 1831,
Robert Brown
discovered the nucleus in the cell. The nucleus in eukaryotic cells is a protoplasmic body covered by a double membrane that contains hereditary details. Robert Brown discovered the nucleus in 1831.
What is a nuclei in physics?
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 atomic mass of the nucleus is given by, A=Z+N, where, N, is the number of neutrons in the nucleus.
What is importance of nucleus?
The nucleus is the most important organelle in the cell. It
contains the genetic material, the DNA
, which is responsible for controlling and directing all the activities of the cell. All the RNAs needed for the cell are synthesised in the nucleus.
Who discovered the cell?
Initially discovered by
Robert Hooke
in 1665, the cell has a rich and interesting history that has ultimately given way to many of today’s scientific advancements.
What contains Nucleoid?
The nucleoid contains
the genomic DNA, and molecules of RNA and proteins
. The main proteins of the nucleoid are: RNA polymerase, topoisomerases and the histone-like proteins: HU, H-NS (H1), H, HLP1, IHF and FIS. … DNA supercoiling is generated by the activity of the topoisomerases and by DNA-protein interactions.
How many nuclei are in the brain?
The
sixteen
cranial nerve nuclei can be most easily remembered if they are assembled into functional groups and anatomical location (Table A3—from Purves et al., Neuroscience, 6th Ed.; Figure 4.2).
Which nucleus is absent?
Complete answer:
the nucleus is absent in
mature sieve tube cells and mammalian erythrocytes
. Sieve tube is described as the cells of the phloem tissue present in vascular plants.
What is an example of a nucleus in real life?
Every cell in your body has a nucleus, and a full set of your DNA in it.
A hen’s egg is a single cell
. The small, spongy gray thing in the middle of the yolk is the cell’s nucleus.
