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Nucleus in Biological Dictionary

Protons

... mass 1,836 times that of the electron Atomic nucleus The central region of an atom. Atoms are ... ... Adding or removing protons from the nucleus of an ... Proton , elementary particle that ... with ... Protons make up part of the nucleus of all atoms except ... Protons .com ... 2 ...

Prokaryotes

... are a group of organisms that lack a cell nucleus (= karyon), or any other membrane-bound ... -ee-oht) Organisms whose cells do not have a nucleus in which DNA is housed and which lack many of ... a bacterium, characterized by the absence of a nucleus and other specialized ... Prokaryotes ...

Polar nuclei

... contents into the female gametophyte, the egg nucleus is fertilized by one of the sperm, the other ... are contained within the embryo sac. ... nucleus fertilizes a polar cell with two 1N nuclei ... nuclei fuse to form a diploid polar nucleus that ... chalazal antipodal cells, two polar ...

Organelles

... plasma membrane and containing a membrane-bound nucleus and organelles . Explore the structure of ... ... ... The larger organelles , such as the nucleus and vacuoles, are easily visible with ... Not ... . ... Organelles : (1) nucleolus (2) nucleus (3) ribosomes (little dots) (4) vesicle ... ...

Nucleus

... In cell biology, the nucleus , also sometimes referred to as the "control ... organized as multiple long ... nucleus (neuroanatomy), a central nervous system structure composed mainly of gray matter ... nucleus (band), a British jazz-rock band led by Ian ...

Nucleolus

... ... Organelles: (1) nucleolus (2) nucleus (3) ribosome (4) vesicle (5) rough ... After ... ... Nucleolus , structure within the nucleus of cells, involved in the manufacture of ... ... Biology: The Nucleolus ... Cell Organelles: The nucleus and Nucleolus ... The Nucleolus . Nuclear ...

Nuclear membrane

... physical barrier, separating the contents of the nucleus from the cytosol (cytoplasm). Many nuclear ... membrane that encloses the contents of the nucleus during most of the cell's lifecycle. ... ... Nuclear Membrane - A structure that binds the nucleus within the cell. ... It also connects the the ...

Nuclear lamina

... lamina is a dense fibrillar network inside the nucleus of an eukaryotic cell. It is composed of ... physical barrier, separating the contents of the nucleus from the cytosol (cytoplasm). Many nuclear ... n. The double-layered membrane enclosing the nucleus of a cell. ... The inner nuclear membrane is ...

Mitosis

... cell separates the chromosomes in its cell nucleus into two identical sets in two daughter nuclei. ... the replicated genes, packaged within the nucleus as chromosomes, ... Includes images and a ... ... Mitosis , process in which a cell's nucleus replicates and divides in preparation ... ...

Karyoplasm

... and ... karyoplasm . the substance forming the nucleus of a cell. — karyoplasmic, ... karyoplasm ... . n. the protoplasm that constitutes the nucleus of a cell. PROTOTYPE PAGE, Source: WordNet ... ... 3-4 hr ... The protoplasm composing the nucleus of a cell; karyoplasm . ... karyoplasm . ...

Karyokinesis

... process consisting of the division of the nucleus of a ... Definition and other additional ... process consisting of the division of the nucleus of a cell during mitosis or ... What is the ... division, the process of partition of a cell's nucleus ... karyokinesis . ... karyokinesis . n. ......

Diploid nuclei

... dictionary of terms from medicine, ... A nucleus containing the diploid or normal double ... for ... The dictionary term diploid nucleus was found in Taber's Medical Dictionary Online, ... nuclei , once, in 500 mitoses. ... A nucleus is diploid if it contains two copies of each ...

Chromatin

... and proteins, primarily histones, in the cell nucleus that stains readily with basic dyes and ... . ... Chromatin is that portion of the cell nucleus which contains all of the DNA of ... ... "khroma" meaning coloured ... an interphase nucleus chromatin is organized into functional ... ...

Chloroplast DNA

... ... DNA transfer from chloroplast to nucleus is much rarer in. Chlamydomonas than ... ... transfer rate of chloroplast DNA into the nucleus ... Chloroplasts contain multiple copies of ... dna , evolution, mitochondira, mtDNA, nucleus ... compacting the chloroplast genome, and ...

Cell nucleus

... In cell biology, the nucleus , also sometimes referred to as the "control ... organized as multiple long ... Cell nucleus The largest of the membrane-bounded organelles ... The eukaryotic cell's organelles include the nucleus , mitochondria, endoplasmic ... The ...

Thrombocytes

... differ from the mammalian thrombocytes not only in having a nucleus and thus resembling B lymphocytes, but also these nucleated thrombocytes ... ... megakaryocyte ( ) n. A large bone marrow cell with a lobulate nucleus that ... for the production of blood thrombocytes (platelets), which ...

Somatic cell

... technique for creating a clonial embryo, using an ovum with a donor nucleus . It can be used in embryonic stem cell research, ... ... where ... technique for creating a ... into the egg, the somatic cell nucleus is reprogrammed. Reprogramming ... Milk somatic cell count (SCC) ...

Rough ER

... Micrograph of rough endoplasmic reticulum network around the nucleus (shown in ... Only properly-folded proteins are transported from the ... meaning "within the cytoplasm," reticulum meaning ... 1 nucleus 2 Nuclear pore 3 Rough endoplasmic reticulum (rER) 4 Smooth ... ... ...

Proteasome

... as well as in some bacteria. In eukaryotes, they are located in the nucleus and the cytoplasm. The main function of the proteasome is to degrade ... biochemistry ) A large proteolytic particle found in the cytoplasm and nucleus of all eukaryotic cells that is the site The scientific resource for ...

Nucleosome

... chromatin, which is used to pack the large eukaryotic genomes into the nucleus while still ensuring appropriate access to it . Nucleosomes are folded ... terms,biology abbreviations ... Nucleosome role in the nucleus ... The Dynamic Nucleosome ... Nucleosome Positioning. ... ...

Nuclein

... dictionary. nuclein n. Any of the substances present in the nucleus of a cell, consisting chiefly of proteins, phosphoric acids, and nucleic ... (plural nucleins) (biochemistry) Any of the compounds present in the nucleus of a cell ... Mass, Mass Production, Mass Spectrometry, Mathematics, ...

Nucleoli

... small, typically round granular body composed of protein and RNA in the nucleus of a cell ... nucleoli . nucleole ... nucleoli Plural form of nucleolus . ... Difference between nucleoli and csytoplasm? ... Does the nucleus contain one or more nucleoli ? Is the nucleoli present? ... The ...

Micronucleus

... A micronucleus is the smaller nucleus in ciliate protozoans, such as the paramecium. In fission it divides by ... the pairing of gamete nuclei, by whose reciprocal fusion a zygote nucleus is formed, which gives rise to the macronuclei and micronuclei of the ...

Macronucleus

... A macronucleus is the larger type of nucleus in ciliates. Macronuclei are polyploid and undergo direct division ... karyogamy of the micronuclei. The macronucleus ... relatively large nucleus believed to influence many cell activities. It occurs in suctorian and ...

Eukaryotes

... or multicellular organism whose cells contain a distinct membrane-bound nucleus ... found in nearly all eukaryotes . ... Eukaryote , organism whose ...... Eukaryotes contain membrane-bound nuclei and other organelles, ... nucleus - holds genomic DNA in eukaryotes ... photosynthesis in eukaryotes . ...

Eukaryote

... or multicellular organism whose cells contain a distinct membrane-bound nucleus ... the Root of the Eukaryote Tree" ... A eukaryote (or eucaryote) ... is a type of cell (or unicellular organism) that possesses a nucleus ... animals, plants and fungi are all eukaryotes , but bacteria ...

Erythrocytes

... (red cells) ... man and in all mammals, erythrocytes are devoid of a nucleus ... red blood cell n. ( Abbr. RBC ) A cell in the blood of ... Erythrocytes Red blood cells; in birds, unlike mammals, these retain a nucleus ... of the erythrocytes ? Read ... What is the function of a ...

Deoxyribonucleic acid

... science held that the Deoxyribonucleic acid : the chemical inside the nucleus ... How does DNA really work? This DNA primer will give you a basic understanding ... Deoxyribonucleic acid : the chemical inside the nucleus of a cell that carries ... A stable deoxyribonucleic acid (DNA) ...

Cytoplasm

... separate from the ... cytoplasm n. The protoplasm outside the nucleus of a cell. cytoplasmic cy ' toplas ' mic adj. ... Schematic showing the ... of a ... cytoplasm the protoplasm of a cell excluding the nucleus ... sheet of cytoplasm characteristic of ... ectoplasm — the outer ...

Centrosome

...by... centrosome ( ) n. A small region of cytoplasm adjacent to the nucleus that contains the centrioles and serves to organize microtubules ... External references. 534 gene ... Centrosomes occur close to the nucleus during ... centrosome [534 ... Destruction of one centrosome with ...

Cell division

... to its division and duplication (replication). In cells without a nucleus (prokaryotes), the cell cycle occurs via a ... cell ... n. Biology. , pl. -ses . The process in cell division by which the nucleus divides, typically The part of the cell division cycle that gets ...

Cell body

... brain cells, skin ... cell body (soma, perikaryon)-contains the nucleus and many of the cell's ... Their cell bodies are located in the ... have the same cytoplasmic components as other types ... cell's large nucleus and nucleolus are the most prominent cell body ... ...

Atom

... The atom is a basic unit of matter consisting of a dense, central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically ......

Unicellular

... is controlled at both the ... Prokaryote, relatively simple unicellular organism, such as a bacterium, characterized by the absence of a nucleus and other specialized ... Scientists discover microRNAs in the unicellular green alga, Chlamydomonas reinhardtii. This is the first finding ...

Ubiquitin

... one or ... ubiquitin ( yü′bikwə′tin ) ( biochemistry ) A small, 76-amino-acid, highly conserved protein present in the cytoplasm and nucleus of all eukaryotes Ubiquitin ligase A ubiquitin ligase (also called an E3 ubiquitin ligase) is a protein that covalently attaches ...

Transcription unit

... the E1A unit , the insertion of the ... The EIB transcription unit was the only early gene affected, and complementation ... ... nucleus which define the three major classes of eukaryotic transcription unit : ... Class II Transcription Units ... Class III Transcription Units ...

Telophase

... poles and are eventually redistributed into chromatin. ... fourth fluorescence image of telophase . ... Mitosis, process in which a cell's nucleus replicates and divides in preparation ... In telophase , the final stage of mitosis, a new nuclear membrane forms around ... A stage-by-stage ...

Striate

... Striatum. From Wikipedia, the free encyclopedia (Redirected from Striate body) ... The striatum also known as striate body or striate nucleus is a subcortical (i.e. ... striate ( ) tr.v. , -ated , -ating , -ates . To mark with striae or striations . adj. ... striate , striated . ...

Spindle Fibers

... spindle poles ... Other spindle fibers elongate but instead of attaching to chromosomes, overlap ... Mitosis, process in which a cell's nucleus replicates and divides in preparation ... The spindle fibers attach to the chromatids near the centromeres, and tug and ... muscle spindle ...

Spermatids

... the testicles of rats of both groups, the ... ( t) Newly formed Sa spermatids of stage I have the smallest spherical nuclei of ... ( y) The nucleus of Sc spermatids in stage VI has shortened to the typical length ... Silver grains are localized in elongating spermatids (arrows) ... ...
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