Name: cell organization in prokaryotes and eukaryotes
Uploaded: 2025-06-12T09:28:11.000Z
Duration: 1 min 28 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

North Carolina K-12 Science Standard Course of Study

9-12

Biology

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms- Structures and Processes

LS.Bio.1.4

Prokaryotic vs. Eukaryotic Cells

As células procarióticas e eucarióticas diferem significativamente em estrutura e função. As células procarióticas, como bactérias e arqueias, são simples e não possuem organelas ligadas à membrana, incluindo o núcleo. Eles são tipicamente unicelulares e pequenos, variando de 0,1 a 5,0 micrômetros de comprimento. Seus genomas compreendem uma única molécula de DNA circular na região nucleóide. Os procariontes têm ribossomos 70S, que são menores em comparação com os ribossomos eucarióticos. Eles têm estruturas internas mais simples, que permitem rápido crescimento e reprodução, muitas vezes por meio de fissão binária. Por outro lado, as células eucarióticas, encontradas em plantas, animais, fungos e protozoários, são mais complexas. Eles contêm organelas ligadas à membrana, como o núcleo, as mitocôndrias e o retículo endoplasmático, que permitem a compartimentalização das funções celulares. Eles têm grandes genomas feitos de DNA linear armazenado no núcleo. As células eucarióticas medem de 10 a 100 micrômetros ou mais e podem formar organismos multicelulares com tipos de células especializadas para funções biológicas complexas. Eles também têm os ribossomos 80S maiores, refletindo sua complexa maquinaria de síntese de proteínas.

células procarióticas vs. eucarióticas

As c&#233;lulas procari&#243;ticas e eucari&#243;ticas representam dois tipos fundamentais de organiza&#231;&#227;o celular, diferenciando-se significativamente em estrutura, complexidade e fun&#231;&#227;o. Tais distin&#231;&#245;es sustentam a diversidade biol&#243;gica observada nos dom&#237;nios da vida.
Caracter&#237;sticas das C&#233;lulas Procari&#243;ticas
As c&#233;lulas procari&#243;ticas, exemplificadas por bact&#233;rias e arqueias, s&#227;o estruturalmente simples e carecem de organelas delimitadas por membrana, incluindo o n&#250;cleo. Seu material gen&#233;tico consiste em uma &#250;nica mol&#233;cula de DNA circular localizada na regi&#227;o do nucleoide, n&#227;o delimitada por uma membrana nuclear. Os procariontes s&#227;o tipicamente pequenos, variando de 0,1 a 5,0 micr&#244;metros, e s&#227;o quase exclusivamente unicelulares. Apesar de sua simplicidade, exibem crescimento e reprodu&#231;&#227;o eficientes, frequentemente se dividindo rapidamente por fiss&#227;o bin&#225;ria. Os ribossomos dos procariontes s&#227;o do tipo 70S, menores e mais simples que os ribossomos eucari&#243;ticos, mas suficientes para suprir suas necessidades de s&#237;ntese proteica.
Caracter&#237;sticas das C&#233;lulas Eucari&#243;ticas
Em contraste, as c&#233;lulas eucari&#243;ticas, encontradas em fungos, algas, protozo&#225;rios e outros protistas, s&#227;o altamente complexas. Elas se caracterizam pela presen&#231;a de organelas membranosas, como o n&#250;cleo, que abriga seu DNA linear organizado em cromossomos. Outras organelas, como as mitoc&#244;ndrias, o ret&#237;culo endoplasm&#225;tico e o complexo de Golgi, permitem a compartimentaliza&#231;&#227;o das fun&#231;&#245;es celulares, aumentando a efici&#234;ncia e a especializa&#231;&#227;o. As c&#233;lulas eucari&#243;ticas s&#227;o significativamente maiores, medindo entre 10 e 100 micr&#244;metros ou mais, e podem formar organismos multicelulares com tipos celulares especializados. Seus ribossomos maiores, do tipo 80S, refletem uma maquinaria de s&#237;ntese proteica mais avan&#231;ada, capaz de sustentar as exig&#234;ncias de sua estrutura e fun&#231;&#245;es complexas.
Implica&#231;&#245;es Funcionais e Evolutivas
Essas diferen&#231;as fundamentais na estrutura e organiza&#231;&#227;o celular permitem que os procariontes prosperem em ambientes diversos com r&#225;pida adaptabilidade. Em contraste, as c&#233;lulas eucari&#243;ticas possibilitam o desenvolvimento de tecidos e sistemas altamente especializados em organismos multicelulares. A compartimentaliza&#231;&#227;o e a maior complexidade das c&#233;lulas eucari&#243;ticas representam um avan&#231;o evolutivo significativo, permitindo processos biol&#243;gicos intrincados e n&#237;veis superiores de organiza&#231;&#227;o dos organismos.

Células procarióticas vs. eucarióticas

As c&#233;lulas procari&#243;ticas e eucari&#243;ticas representam dois tipos fundamentais de organiza&#231;&#227;o celular, diferenciando-se ...

Education

JoVE Core

Microbiology

Microbiologia

Unit

Unidade

Microbial Cell Structure and Function        

Estrutura e Função da Célula Microbiana

KEY TERMS AND CONCEPTS

TERMOS E CONCEITOS-CHAVE

cell organization in prokaryotes and eukaryotes

Prokaryotic and eukaryotic cells show two major patterns of cell organization. These differences shape the structure, size, and function of living things across the domains of life.

Prokaryotic cells, such as bacteria and archaea, are simple in structure. They do not have a nucleus or other membrane-bound organelles. Their DNA is usually a single circular molecule found in the nucleoid region, which is not surrounded by a nuclear membrane. Prokaryotes are usually very small, about 0.1 to 5.0 micrometers, and they are almost always unicellular.

Even with this simple design, prokaryotes grow and reproduce efficiently. Many divide quickly by binary fission, a form of cell division that makes two new cells. They also contain 70S ribosomes, which are smaller than the ribosomes found in eukaryotic cells and still support protein synthesis.

Eukaryotic cells are more complex and are found in fungi, algae, protozoa, and other protists. They have a nucleus that contains linear DNA arranged into chromosomes. They also have membrane-bound organelles such as mitochondria, the endoplasmic reticulum, and the Golgi apparatus. These internal compartments help separate tasks and make cell functions more efficient.

Eukaryotic cells are much larger, often measuring 10 to 100 micrometers or more. They can also form multicellular organisms with specialized cell types. Their 80S ribosomes are larger than prokaryotic ribosomes and support the protein production needed for this more complex organization.

These differences help explain why prokaryotes can adapt quickly in many environments. Eukaryotic cells, in contrast, support specialized tissues and body systems in multicellular life. Their compartmentalized structure is an important evolutionary step that allows more complex biological processes.

Cell Organization in Prokaryotes and Eukaryotes

cell-organization-in-prokaryotes-and-eukaryotes

prokaryotic vs. eukaryotic cells

Prokaryotic and eukaryotic cells show two major patterns of cell organization. These differences shape the structure, size, and function of living things across the domains of life. Prokaryotic cells, such as bacteria and archaea, are simple in structure. They do not have a nucleus or other membrane-bound organelles. Their DNA is usually a single circular molecule found in the nucleoid region, which is not surrounded by a nuclear membrane. Prokaryotes are usually very small, about 0.1 to 5.0...

microbial morphologies 

Microbial Shapes and Cell Forms

Microbial shapes and cell forms help bacteria, archaea, and eukaryotic microbes survive in many environments. Cell shape affects how these organisms grow, take up nutrients, and handle waste. It also reflects the link between structure and function. Among bacteria, cocci and bacilli are the most common shapes. Cocci are spherical cells, and they may appear alone or in pairs called diplococci, chains called streptococci, clusters called staphylococci, or groups of four called tetrads. Bacilli...

bacterial cell wall 

Gram-Positive and Gram-Negative Walls

Bacterial cell walls give bacteria their shape and help protect them from osmotic stress. This rigid but flexible layer surrounds the plasma membrane and supports cellular integrity. Its main building block is peptidoglycan, a mesh-like polymer that adds strength while still allowing some flexibility. Peptidoglycan is made of alternating N-acetylglucosamine, or NAG, and N-acetylmuramic acid, or NAM. Short amino acid chains connect these sugar units and help form the strong network. The...

archaeal cell wall

Archaeal Cell Wall Types and Functions

Archaeal cell walls protect archaea and help them survive in extreme environments. Unlike bacterial cell walls, they do not have the peptidoglycan layer found in most bacteria. Instead, archaea use a range of materials, including proteins, polysaccharides, and pseudomurein, to build their outer layer. The most common archaeal cell wall is the S-layer, or surface layer. It is made of tightly packed protein or glycoprotein units that form a crystalline lattice. These repeating patterns can make...

peptidoglycan synthesis

Building the Bacterial Cell Wall

Peptidoglycan builds the bacterial cell wall and gives the cell its shape and strength. It is a mesh-like polymer around the bacterial plasma membrane. The polymer is made of repeating sugar units, N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM), linked by β-1,4 glycosidic bonds. Short peptide chains cross-link the sugar chains and make the wall more rigid. Peptidoglycan biosynthesis starts in the cytoplasm with soluble precursors. Uridine diphosphate, or UDP, binds to NAG and NAM to...

plasma membrane in bacteria and archaea

Bacterial vs Archaeal Membrane Lipids

Bacterial and archaeal plasma membranes control what enters and leaves the cell. They also help maintain cell integrity. Although both membranes do the same basic job, their structures are different because bacteria and archaea face different environmental demands. Bacterial plasma membranes are mainly made of phospholipids. These lipids have fatty acid chains linked to a glycerol backbone by ester bonds. They form a bilayer, with hydrophilic glycerol-phosphate heads facing outward and...

outer layers of the cell envelope

Capsules, Slime Layers, and S-Layers

Capsules, slime layers, and S-layers are outer coverings on prokaryotic cells. These layers help bacteria and archaea survive, attach to surfaces, and interact with their environment. They are often made of polysaccharides, polypeptides, proteins, or glycoproteins. Capsules are tightly bound and highly organized layers that stick firmly to the bacterial cell wall. They are usually made of polysaccharides, although some are made of polypeptides. A capsule protects cells from dehydration and can...

flagella and motility in bacteria

Bacterial Flagella as Tiny Rotary Motors

Bacterial flagella are thread-like structures that help cells move and respond to their surroundings. They extend from the cell envelope and support both motility and chemotaxis, which is the ability to move in response to chemical signals. Their design shows how bacteria use specialized structures to survive in different environments. A flagellum has three main parts: the filament, the hook, and the basal body. The filament is the long, helical part made of repeating flagellin protein...

fimbriae, pili, and axial filaments

How Bacteria Stick, Share Genes, and Move

Fimbriae, pili, and axial filaments are bacterial surface structures that help cells attach, exchange genes, and move. These hairlike appendages are made mainly of pilin protein. They support bacterial survival in different environments and can also increase pathogenicity. Fimbriae are fine, filament-like structures that are densely packed on the bacterial surface. They are about 2 to 10 nanometers wide and help bacteria attach to nonliving surfaces and to host tissues. This adhesion is an...

cell inclusions

Prokaryotic Cell Storage Inclusions

Prokaryotic cell storage inclusions help bacteria store nutrients, manage energy, and adapt to changing environments. These inclusions let cells survive when food, phosphate, sulfur, light, or oxygen levels change. They are important examples of how simple cells can still have highly specialized structures. Some inclusions store carbon. Poly-β-hydroxybutyric acid, or PHB, forms granules that act as a long-term carbon and energy reserve. Glycogen granules also store carbon, but they provide a...

endospores and sporulation

How Bacteria Survive with Endospores

Endospores help some bacteria survive harsh conditions. These dormant cells are made mainly by Gram-positive bacteria such as Bacillus and Clostridium. They are highly resistant to heat, ultraviolet and ionizing radiation, drying, and toxic chemicals. In rare cases, endospore-like structures have also been seen in some Gram-negative bacteria, including Coxiella burnetii and Sporosarcina ureae, as well as in other species exposed to extreme conditions. Sporulation begins when bacteria face...

nucleoid

How Prokaryotes Organize DNA

Prokaryotes organize their DNA in the nucleoid, a distinct region where genetic material and associated proteins are packed. Because prokaryotic cells do not have a membrane-bound nucleus, the nucleoid helps keep DNA organized and available for cell activities. In most bacteria and archaea, the DNA is a single, circular, double-stranded molecule that is tightly compacted by supercoiling and protein interactions. Nucleoid-associated proteins, or NAPs, help shape and maintain this DNA region.

surface appendages of archaea

Archaeal Pili and Archaella in Action

Archaeal pili and archaella help archaea survive, attach, and move in challenging environments. These surface appendages support adhesion, biofilm formation, and motility. They give archaeal cells key advantages in habitats that can be extreme. Pili are filament-like structures made from pilin protein subunits. Their main role is adhesion, which means helping cells stick to surfaces. They also support biofilm formation, where cells live in a shared, surface-attached community. Some pili are...

key terms and concepts

Compare prokaryotic and eukaryotic cell organization, from nuclei and organelles to DNA shape, size, ribosomes, and cell division in grades 9–12.

Cell Organization in Prokaryotes and Eukaryotes | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

Virginia  Standards of Learning

HIgh School

BIO.3

BIO.3.b

BIO.4

BIO.4.c

BIO.6

BIO.6.a

Life Science

LS.2

LS.2.c

new-york-state-science-learning-standards

New York State Science Learning Standards

Middle School

Earth and Space Sciences

Space Systems

MS-ESS1-1

Minnesota Academic Standards in Science

Earth and Space Science

1.1.1 Earth’s Place in the Universe

4.2.2

south-carolina-college-and-career-ready-science-standards

South Carolina College and Career Ready Science Standards

Earth's Place in the Universe

8-ESS1-1

8-ESS1-2

8-ESS1-3

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introduction-to-mechanisms-of-enzyme-catalysis

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Prokaryotic Cells

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Cytoplasm

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The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression ...

Endoplasmic Reticulum

Endoplasmic ReticulumThe endoplasmic reticulum (ER) is an extensive network of membranous sacs and tubules in eukaryotic cells, continuous with the outer ...

Ribosomes

Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that ...

Golgi Apparatus

As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are ...

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules ...

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration&#x2014;the ...

Introduction to the Cytoskeleton

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overview-of-myosin-structure-and-function

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Use models to explain how the structure of organelles determines its function and supports overall cell processes.

LS.Bio.1.3

Analyze how the relationship between structure and function supports life processes within organisms.

Cell Organization in Prokaryotes and Eukaryotes

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