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Is The Nucleolus In Plant Or Animal Cells

Branch of biological science that studies cells

Cell biology (also cellular biology or cytology) is a branch of biological science that studies the structure, function and beliefs of cells.[1] [2] All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and functioning of organisms. Cell biological science is the study of structural and functional units of cells. Prison cell biology encompasses both prokaryotic and eukaryotic cells and has many subtopics which may include the study of cell metabolism, cell communication, cell cycle, biochemistry, and cell composition. The study of cells is performed using several microscopy techniques, cell culture, and prison cell fractionation. These have allowed for and are currently existence used for discoveries and inquiry pertaining to how cells function, ultimately giving insight into understanding larger organisms. Knowing the components of cells and how cells work is primal to all biological sciences while also being essential for enquiry in biomedical fields such as cancer, and other diseases. Research in cell biological science is interconnected to other fields such as genetics, molecular genetics, molecular biology, medical microbiology, immunology, and cytochemistry.

History [edit]

Cells were first seen in 17th century Europe with the invention of the chemical compound microscope. In 1665, Robert Hooke termed the building block of all living organisms as "cells" (published in Micrographia) afterward looking at a slice of cork and observing a prison cell-similar structure,[three] [iv] however, the cells were expressionless and gave no indication to the actual overall components of a cell. A few years later, in 1674, Anton Van Leeuwenhoek was the first to clarify live cells in his examination of algae. All of this preceded the cell theory which states that all living things are fabricated upwardly of cells and that cells are the functional and structural unit of organisms. This was ultimately concluded by plant scientist, Matthias Schleiden[4] and beast scientist Theodor Schwann in 1838, who viewed live cells in institute and beast tissue, respectively.[5] 19 years later on, Rudolf Virchow further contributed to the jail cell theory, adding that all cells come from the partitioning of pre-existing cells.[five] Viruses are not considered in cell biology – they lack the characteristics of a living jail cell, and instead are studied in the microbiology subclass of virology.[6]

Techniques [edit]

Prison cell biological science enquiry looks at unlike ways to culture and manipulate cells outside of a living body to farther research in homo beefcake and physiology, and to derive medications. The techniques by which cells are studied have evolved. Due to advancements in microscopy, techniques and engineering have immune scientists to agree a better understanding of the structure and function of cells. Many techniques commonly used to study cell biological science are listed beneath:[7]

  • Prison cell culture: Utilizes rapidly growing cells on media which allows for a large amount of a specific cell type and an efficient way to written report cells.[8] Prison cell civilisation is one of the major tools used in cellular and molecular biology, providing excellent model systems for studying the normal physiology and biochemistry of cells (e.g., metabolic studies, crumbling), the furnishings of drugs and toxic compounds on the cells, and mutagenesis and carcinogenesis. It is also used in drug screening and development, and large scale manufacturing of biological compounds (east.g., vaccines, therapeutic proteins).
  • Fluorescence microscopy: Fluorescent markers such equally GFP, are used to label a specific component of the prison cell. Subsequently, a certain light wavelength is used to excite the fluorescent marker which can then be visualized.[8]
  • Stage-contrast microscopy: Uses the optical aspect of light to represent the solid, liquid, and gas-phase changes every bit brightness differences.[viii]
  • Confocal microscopy: Combines fluorescence microscopy with imaging by focusing calorie-free and snap shooting instances to grade a 3-D image.[viii]
  • Transmission electron microscopy: Involves metal staining and the passing of electrons through the cells, which will be deflected upon interaction with metal. This ultimately forms an prototype of the components being studied.[8]
  • Cytometry: The cells are placed in the machine which uses a beam to scatter the cells based on different aspects and tin can therefore separate them based on size and content. Cells may also be tagged with GFP-fluorescence and can be separated that way equally well.[9]
  • Cell fractionation: This process requires breaking up the prison cell using loftier temperature or sonification followed by centrifugation to split the parts of the cell allowing for them to be studied separately.[eight]

Cell types [edit]

A drawing of a prokaryotic cell

At that place are ii fundamental classifications of cells: prokaryotic and eukaryotic. Prokaryotic cells are distinguished from eukaryotic cells by the absence of a cell nucleus or other membrane-bound organelle.[10] Prokaryotic cells are much smaller than eukaryotic cells, making them the smallest grade of life.[11] Prokaryotic cells include Bacteria and Archaea, and lack an enclosed cell nucleus.  Eukaryotic cells are found in plants, animals, fungi, and protists. They range from 10–100 μm in diameter, and their DNA is contained inside a membrane-bound nucleus. Eukaryotes are organisms containing eukaryotic cells. The 4 eukaryotic kingdoms are Animalia, Plantae, Fungi, and Protista.

They both reproduce through binary fission. Bacteria, the most prominent blazon, accept several dissimilar shapes, although nigh are spherical or rod-shaped. Bacteria can exist classed as either gram-positive or gram-negative depending on the cell wall composition. Gram-positive bacteria have a thicker peptidoglycan layer than gram-negative leaner. Bacterial structural features include a flagellum that helps the cell to motion,[12] ribosomes for the translation of RNA to protein,[12] and a nucleoid that holds all the genetic material in a circular construction.[12] There are many processes that occur in prokaryotic cells that allow them to survive. In prokaryotes, mRNA synthesis is initiated at a promoter sequence on the Deoxyribonucleic acid template comprising two consensus sequences that recruit RNA polymerase. The prokaryotic polymerase consists of a core enzyme of four protein subunits and a σ poly peptide that assists but with initiation. For example, in a process termed conjugation, the fertility cistron allows the bacteria to possess a pilus which allows information technology to transmit DNA to another bacteria which lacks the F cistron, permitting the transmittance of resistance allowing it to survive in sure environments.[13]

Construction and function [edit]

Structure of eukaryotic cells [edit]

A diagram of an brute cell

Eukaryotic cells are composed of the following organelles:

  • Nucleus: The nucleus of the prison cell functions as the genome and genetic data storage for the cell, containing all the DNA organized in the class of chromosomes. Information technology is surrounded by a nuclear envelope, which includes nuclear pores allowing for the transportation of proteins between the inside and outside of the nucleus.[fourteen] This is also the site for replication of Deoxyribonucleic acid besides as transcription of Dna to RNA. Later on, the RNA is modified and transported out to the cytosol to be translated to protein.[fifteen]
  • Nucleolus: This structure is inside the nucleus, usually dumbo and spherical in shape. It is the site of ribosomal RNA (rRNA) synthesis, which is needed for ribosomal assembly.
  • Endoplasmic reticulum (ER): This functions to synthesize, shop, and secrete proteins to the Golgi appliance.[xvi] Structurally, the endoplasmic reticulum is a network of membranes found throughout the cell and continued to the nucleus. The membranes are slightly unlike from cell to cell and a cell's function determines the size and structure of the ER.[17]
  • Mitochondria: Normally known every bit the powerhouse of the cell is a double membrane bound jail cell organelle.[18] This functions for the production of energy or ATP within the cell. Specifically, this is the place where the Krebs cycle or TCA cycle for the production of NADH and FADH occurs. Afterwards, these products are used within the electron send concatenation (ETC) and oxidative phosphorylation for the terminal production of ATP.[19]
  • Golgi apparatus: This functions to further procedure, parcel, and secrete the proteins to their destination. The proteins incorporate a signal sequence that allows the Golgi apparatus to recognize and direct it to the correct place. Golgi appliance also produce glycoproteins and glycolipids.[xx]
  • Lysosome: The lysosome functions to dethrone material brought in from the outside of the prison cell or old organelles. This contains many acid hydrolases, proteases, nucleases, and lipases, which break down the various molecules. Autophagy is the process of degradation through lysosomes which occurs when a vesicle buds off from the ER and engulfs the material, then, attaches and fuses with the lysosome to permit the fabric to be degraded.[21]
  • Ribosomes: Functions to translate RNA to protein. it serves as a site of protein synthesis.[22]
  • Cytoskeleton: Cytoskeleton is a structure that helps to maintain the shape and full general system of the cytoplasm. Information technology anchors organelles within the cells and makes up the structure and stability of the prison cell. The cytoskeleton is equanimous of iii principal types of poly peptide filaments: actin filaments, intermediate filaments, and microtubules, which are held together and linked to subcellular organelles and the plasma membrane by a variety of accessory proteins.[23]
  • Jail cell membrane: The jail cell membrane can be described every bit a phospholipid bilayer and is too consisted of lipids and proteins.[12] Considering the inside of the bilayer is hydrophobic and in order for molecules to participate in reactions within the cell, they need to be able to cantankerous this membrane layer to get into the prison cell via osmotic pressure, improvidence, concentration gradients, and membrane channels.[24]
  • Centrioles: Office to produce spindle fibers which are used to split chromosomes during cell division.

Eukaryotic cells may as well be composed of the following molecular components:

  • Chromatin: This makes up chromosomes and is a mixture of DNA with various proteins.
  • Cilia: They help to propel substances and can also exist used for sensory purposes.[25]

Cell metabolism [edit]

Prison cell metabolism is necessary for the product of energy for the cell and therefore its survival and includes many pathways. For cellular respiration, once glucose is available, glycolysis occurs inside the cytosol of the cell to produce pyruvate. Pyruvate undergoes decarboxylation using the multi-enzyme complex to form acetyl coA which can readily exist used in the TCA cycle to produce NADH and FADH2. These products are involved in the electron transport chain to ultimately grade a proton gradient across the inner mitochondrial membrane. This gradient can so drive the production of ATP and H2O during oxidative phosphorylation.[26] Metabolism in plant cells includes photosynthesis which is merely the exact opposite of respiration as it ultimately produces molecules of glucose.

Cell signaling [edit]

Cell signaling or jail cell communication is important for cell regulation and for cells to process information from the environment and answer accordingly. Signaling can occur through straight cell contact or endocrine, paracrine, and autocrine signaling. Straight prison cell-cell contact is when a receptor on a cell binds a molecule that is attached to the membrane of another jail cell. Endocrine signaling occurs through molecules secreted into the bloodstream. Paracrine signaling uses molecules diffusing between two cells to communicate. Autocrine is a cell sending a signal to itself by secreting a molecule that binds to a receptor on its surface. Forms of communication tin exist through:

  • Ion channels: Can be of different types such as voltage or ligand gated ion channels. They allow for the outflow and arrival of molecules and ions.
  • One thousand-protein coupled receptor (GPCR): Is widely recognized to incorporate seven transmembrane domains. The ligand binds on the extracellular domain and in one case the ligand binds, this signals a guanine substitution factor to convert GDP to GTP and actuate the G-α subunit. G-α can target other proteins such equally adenyl cyclase or phospholipase C, which ultimately produce secondary messengers such as army camp, Ip3, DAG, and calcium. These secondary messengers part to dilate signals and can target ion channels or other enzymes. One example for distension of a signal is cAMP binding to and activating PKA past removing the regulatory subunits and releasing the catalytic subunit. The catalytic subunit has a nuclear localization sequence which prompts information technology to go into the nucleus and phosphorylate other proteins to either repress or activate gene activity.[26]
  • Receptor tyrosine kinases: Bind growth factors, farther promoting the tyrosine on the intracellular portion of the poly peptide to cross phosphorylate. The phosphorylated tyrosine becomes a landing pad for proteins containing an SH2 domain allowing for the activation of Ras and the interest of the MAP kinase pathway.[27]

Growth and development [edit]

Eukaryotic cell bicycle [edit]

Cells are the foundation of all organisms and are the fundamental units of life. The growth and development of cells are essential for the maintenance of the host and survival of the organism. For this process, the jail cell goes through the steps of the cell cycle and development which involves prison cell growth, DNA replication, prison cell division, regeneration, and prison cell death.

The prison cell cycle is divided into four distinct phases: G1, Due south, G2, and 1000. The 1000 phase – which is the prison cell growth phase – makes up approximately 95% of the cycle. The proliferation of cells is instigated by progenitors. All cells showtime out in an identical form and can substantially become whatsoever type of cells. Cell signaling such as induction can influence nearby cells to determinate the type of cell information technology volition become. Moreover, this allows cells of the same type to aggregate and form tissues, then organs, and ultimately systems. The G1, G2, and S phase (DNA replication, damage and repair) are considered to exist the interphase portion of the wheel, while the Thousand phase (mitosis) is the cell division portion of the cycle. Mitosis is composed of many stages which include, prophase, metaphase, anaphase, telophase, and cytokinesis, respectively. The ultimate result of mitosis is the formation of 2 identical daughter cells.

The prison cell cycle is regulated in cell cycle checkpoints, by a series of signaling factors and complexes such as cyclins, cyclin-dependent kinase, and p53. When the cell has completed its growth process and if it is found to be damaged or altered, it undergoes cell death, either by apoptosis or necrosis, to eliminate the threat it can cause to the organism's survival.[28]

Cell mortality, prison cell lineage immortality [edit]

The beginnings of each present day cell presumably traces back, in an unbroken lineage for over iii billion years to the origin of life. It is non really cells that are immortal but multi-generational cell lineages.[29] The immortality of a cell lineage depends on the maintenance of cell division potential. This potential may be lost in any particular lineage because of jail cell impairment, terminal differentiation as occurs in nerve cells, or programmed cell death (apoptosis) during development. Maintenance of jail cell division potential over successive generations depends on the avoidance and the authentic repair of cellular damage, specially DNA impairment. In sexual organisms, continuity of the germline depends on the effectiveness of processes for avoiding DNA harm and repairing those Deoxyribonucleic acid damages that do occur. Sexual processes in eukaryotes, equally well equally in prokaryotes, provide an opportunity for constructive repair of Dna damages in the germ line by homologous recombination.[29] [30]

Cell cycle phases [edit]

The cell wheel is a four-stage process that a cell goes through as it develops and divides. It includes Gap i (G1), synthesis (S), Gap 2 (G2), and mitosis (Thou).The cell either restarts the bicycle from G1 or leaves the bike through G0 afterward completing the cycle. The cell can progress from G0 through terminal differentiation.

The interphase refers to the phases of the prison cell cycle that occur betwixt one mitosis and the next, and includes G1, Due south, and G2.

G1 phase [edit]

The size of the jail cell grows.

The contents of cells are replicated.

S phase [edit]

Replication of Dna

The cell replicates each of the 46 chromosomes (23 pairs).

G2 stage [edit]

The jail cell multiplies.

In grooming for cell sectionalization, organelles and proteins class.

M stage [edit]

Later mitosis, cytokinesis occurs (prison cell separation)

Formation of two girl cells that are identical

G0 phase [edit]

These cells exit G1 and enter G0, a resting stage. A cell in G0 is doing its job without actively preparing to split up.[31]

Pathology [edit]

The scientific co-operative that studies and diagnoses diseases on the cellular level is called cytopathology. Cytopathology is more often than not used on samples of complimentary cells or tissue fragments, in contrast to the pathology co-operative of histopathology, which studies whole tissues. Cytopathology is commonly used to investigate diseases involving a wide range of body sites, often to help in the diagnosis of cancer merely as well in the diagnosis of some infectious diseases and other inflammatory atmospheric condition. For example, a mutual application of cytopathology is the Pap smear, a screening exam used to detect cervical cancer, and precancerous cervical lesions that may lead to cervical cancer.[32]

Jail cell wheel checkpoints and DNA damage repair arrangement [edit]

The cell cycle is composed of a number of well-ordered, sequent stages that result in cellular division. The fact that cells do not begin the next stage until the terminal one is finished, is a significant chemical element of jail cell bike regulation. Cell cycle checkpoints are characteristics that plant an fantabulous monitoring strategy for accurate cell cycle and divisions. Cdks, associated cyclin counterparts, protein kinases, and phosphatases regulate cell growth and division from one stage to another.[33] The prison cell cycle is controlled by the temporal activation of Cdks, which is governed by cyclin partner interaction, phosphorylation past detail protein kinases, and de-phosphorylation by Cdc25 family phosphatases. In response to Dna damage, a cell's Deoxyribonucleic acid repair reaction is a cascade of signaling pathways that leads to checkpoint engagement, regulates, the repairing mechanism in Deoxyribonucleic acid, cell cycle alterations, and apoptosis. Numerous biochemical structures, likewise as processes that detect damage in DNA, are ATM and ATR, which induce the Deoxyribonucleic acid repair checkpoints[34]

The cell wheel is a sequence of activities in which cell organelles are duplicated and subsequently separated into daughter cells with precision. There are major events that happen during a cell bicycle. The processes that happen in the cell cycle include jail cell development, replication and segregation of chromosomes.  The cell bike checkpoints are surveillance systems that proceed rails of the cell cycle'south integrity, accuracy, and chronology. Each checkpoint serves as an culling prison cell cycle endpoint, wherein the jail cell'south parameters are examined and just when desirable characteristics are fulfilled does the cell cycle advance through the distinct steps.The jail cell bicycle'southward goal is to precisely copy each organism'south Deoxyribonucleic acid and after every bit split the cell and its components between the two new cells. Iv main stages occur in the eukaryotes. In G1, the jail cell is usually agile and continues to grow rapidly, while in G2, the cell growth continues while protein molecules get set for separation. These are not dormant times; they are when cells gain mass, integrate growth factor receptors, found a replicated genome, and fix for chromosome segregation. DNA replication is restricted to a divide Synthesis in eukaryotes, which is also known as the S-stage. During mitosis, which is also known as the M-phase, the segregation of the chromosomes occur.[35] Dna, like every other molecule, is capable of undergoing a wide range of chemical reactions. Modifications in DNA's sequence, on the other hand, take a considerably bigger impact than modifications in other cellular constituents like RNAs or proteins because DNA acts equally a permanent copy of the cell genome. When erroneous nucleotides are incorporated during DNA replication, mutations can occur. The majority of Deoxyribonucleic acid harm is stock-still by removing the lacking bases and then re-synthesizing the excised area. On the other mitt, some Dna lesions tin be mended by reversing the impairment, which may exist a more effective method of coping with common types of DNA damage. Just a few forms of DNA impairment are mended in this way, including pyrimidine dimers acquired by ultraviolet (UV) light inverse past the insertion of methyl or ethyl groups at the purine ring's O6 position.[36]

Mitochondrial membrane dynamics [edit]

Mitochondria are commonly referred to as the cell's "powerhouses" because of their capacity to effectively produce ATP which is essential to maintain cellular homeostasis and metabolism. Moreover, researchers have gained a better noesis of mitochondria's significance in jail cell biology because of the discovery of prison cell signaling pathways by mitochondria which are crucial platforms for cell office regulation such equally apoptosis. Its physiological adaptability is strongly linked to the jail cell mitochondrial aqueduct's ongoing reconfiguration through a range of mechanisms known as mitochondrial membrane dynamics, which include endomembrane fusion and fragmentation (separation) as well equally ultrastructural membrane remodeling. As a effect, mitochondrial dynamics regulate and often choreograph non only metabolic but also complicated prison cell signaling processes such every bit cell pluripotent stem cells, proliferation, maturation, aging, and mortality. Mutually, mail service-translational alterations of mitochondrial apparatus and the evolution of transmembrane contact sites amidst mitochondria and other structures, which both take the potential to link signals from various routes that affect mitochondrial membrane dynamics substantially,[35] Mitochondria are wrapped by two membranes: an inner mitochondrial membrane (IMM) and an outer mitochondrial membrane (OMM), each with a distinctive part and construction, which parallels their dual role as cellular powerhouses and signaling organelles. The inner mitochondrial membrane divides the mitochondrial lumen into two parts: the inner border membrane, which runs parallel to the OMM, and the cristae, which are deeply twisted, multinucleated invaginations that give room for surface area enlargement and house the mitochondrial respiration apparatus. The outer mitochondrial membrane, on the other hand, is soft and permeable. It, therefore, acts as a foundation for cell signaling pathways to congregate, be deciphered, and be transported into mitochondria. Furthermore, the OMM connects to other cellular organelles, such as the endoplasmic reticulum (ER), lysosomes, endosomes, and the plasma membrane. Mitochondria play a wide range of roles in cell biology, which is reflected in their morphological diversity. Ever since the beginning of the mitochondrial written report, it has been well documented that mitochondria tin have a variety of forms, with both their general and ultra-structural morphology varying greatly among cells, during the cell cycle, and in response to metabolic or cellular cues. Mitochondria can be every bit independent organelles or as office of larger systems; they can as well be unequally distributed in the cytosol through regulated mitochondrial ship and placement to meet the cell'south localized free energy requirements. Mitochondrial dynamics refers to the adaptive and variable aspect of mitochondria, including their shape and subcellular distribution.[35]

Autophagy [edit]

Autophagy is a self-degradative mechanism that regulates energy sources during growth and reaction to dietary stress. Autophagy likewise cleans up after itself, immigration aggregated proteins, cleaning damaged structures including mitochondria and endoplasmic reticulum and eradicating intracellular infections. Additionally, autophagy has antiviral and antibacterial roles within the cell, and it is involved at the starting time of distinctive and adaptive allowed responses to viral and bacterial contamination. Some viruses include virulence proteins that foreclose autophagy, while others apply autophagy elements for intracellular development or cellular splitting.[37] Macro autophagy, micro autophagy, and chaperon-mediated autophagy are the iii basic types of autophagy. When macro autophagy is triggered, an exclusion membrane incorporates a section of the cytoplasm, generating the autophagosome, a distinctive double-membraned organelle. The autophagosome so joins the lysosome to create an autolysosome, with lysosomal enzymes degrading the components. In micro autophagy, the lysosome or vacuole engulfs a slice of the cytoplasm by invaginating or protruding the lysosomal membrane to enclose the cytosol or organelles. The chaperone-mediated autophagy (CMA) protein quality balls past digesting oxidized and altered proteins under stressful circumstances and supplying amino acids through protein denaturation.[38] Autophagy is the primary intrinsic degradative arrangement for peptides, fats, carbohydrates, and other cellular structures. In both physiologic and stressful situations, this cellular progression is vital for upholding the right cellular balance. Autophagy instability leads to a variety of illness symptoms, including inflammation, biochemical disturbances, aging, and neurodegenerative, due to its involvement in controlling cell integrity. The modification of the autophagy-lysosomal networks is a typical hallmark of many neurological and muscular illnesses. As a upshot, autophagy has been identified as a potential strategy for the prevention and handling of various disorders. Many of these disorders are prevented or improved past consuming polyphenol in the repast. As a effect, natural compounds with the ability to modify the autophagy mechanism are seen as a potential therapeutic choice.[39] The creation of the double membrane (phagophore), which would be known as nucleation, is the start step in macro-autophagy. The phagophore approach indicates dysregulated polypeptides or lacking organelles that come from the cell membrane, Golgi apparatus, endoplasmic reticulum, and mitochondria. With the conclusion of the autophagocyte, the phagophore's enlargement comes to an terminate. The machine-phagosome combines with the lysosomal vesicles to formulate an auto-lysosome that degrades the encapsulated substances, referred to as phagocytosis.[xl]

Notable cell biologists [edit]

  • Jean Baptiste Carnoy
  • Peter Agre
  • Günter Blobel
  • Robert Chocolate-brown
  • Geoffrey M. Cooper
  • Christian de Duve
  • Robert Hooke
  • H. Robert Horvitz
  • Marc Kirschner
  • Anton van Leeuwenhoek
  • Ira Mellman
  • Peter D. Mitchell
  • Rudolf Virchow
  • Paul Nurse
  • George Emil Palade
  • Keith R. Porter
  • Ray Rappaport
  • Michael Swann
  • Roger Tsien
  • Edmund Beecher Wilson
  • Kenneth R. Miller
  • Matthias Jakob Schleiden
  • Theodor Schwann
  • Yoshinori Ohsumi
  • Jan Evangelista PurkynÄ›

See also [edit]

  • The American Society for Cell Biology
  • Cell biophysics
  • Prison cell disruption
  • Cell physiology
  • Cellular adaptation
  • Cellular microbiology
  • Institute of Molecular and Prison cell Biology (disambiguation)
  • Meiomitosis
  • Organoid
  • Outline of prison cell biology

Notes [edit]

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References [edit]

  • Penner-Hahn, James E. (2013). "Chapter ii. Technologies for Detecting Metals in Single Cells. Department four. Intrinsic X-Ray Fluorescence". In Bani, Lucia (ed.). Metallomics and the Jail cell. Metal Ions in Life Sciences. Vol. 12. Springer. pp. 15–twoscore. doi:10.1007/978-94-007-5561-1_2. ISBN978-94-007-5560-4. PMID 23595669. electronic-book ISBN 978-94-007-5561-1 ISSN 1559-0836electronic-ISSN 1868-0402
  • Prison cell and Molecular Biology by Karp fifth Ed., ISBN 0-471-46580-ane
  • Public Domain This article incorporates public domain textile from the NCBI document: "Scientific discipline Primer".

External links [edit]

  • Cell Biology at Curlie
  • Aging Cell
  • "Francis Harry Compton Crick (1916-2004)" by A. Andrei at the Embryo Project Encyclopedia
  • "Biology Resource By Professor Lin."

Source: https://en.wikipedia.org/wiki/Cell_biology

Posted by: chapmancorgunts.blogspot.com

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