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Teoría celular, cell theory Estructura celular: membrana, citoplasma y núcleo. Membrane, cytoplasm and nucleus Orgánulos celulares, organelles. Mitosis y meiosis
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La célula - Cell
1. Valorar la importancia de la teoría celular.
2. Conocer la célula y sus componentes (estructura).a) Membrana: control de intercambio e interacción.b) Citoplasma: orgánulos celulares.c) Núcleo: la información genética (ADN).
3. Conocer las funciones celulares.a) La función de los orgánulos celulares.
4. Tipos de células:a) Procariota y eucariota.b) Animal y vegetal.
5. La división celular:a) Mitosisb) Meiosis
OBJETIVOS:
CONTENIDOS:
1. Teoría celular2. Funciones de la célula:
a) Nutrición.b) Relación.c) Reproducción.
3. Tipos de células
4. La célula eucariota:a) Estructura.b) Orgánulos celulares y función,
5. La reproducción:a) Mitosisb) Meiosis
Cell theory
• Robert Hooke – first person to see cell (1665) • Leeuwehoek – first person to see living cells in pond water (1673)• Schwann – zoologist who observed tissues of animals had cells (1839)• Schleiden – botanist, observed tissues o plants contained cells (1845)• Virchow – reported that every living thing is made of vital units, known as cells (1850)• Remak - discovers cell division and affirm that cells come only from pre-existing cells.
1. All living things are made of cells
Longitudinal section of a root tip of Maize (Zea mays) by Science and Plants for Schools on Flickr (CC) http://flic.kr/p/bNNM6M
Unicellular organisms are single-celled and can carry out all of the functions of life independently.
Multicellular organisms have specialized cells to carry out specific functions.
2. Cells are the smallest units of life.
Paramecium multimicronucleatum by Proyecto Agua on Flickr (CC) http://flic.kr/p/7W7J3y
Organelles cannot survive alone.
Specialized structures within cells (organelles) carry out different functions.
3. Cells come Only from Existing cells
Cells multiply through division:
• Mitosis results in genetically identical diploid daughter cells.
• Meiosis generates haploid gametes (sex cells).
4-cell stage of a sea biscuit by Bruno Vellutini on Flickr (CC) http://flic.kr/p/daWnnS
WHAT´S A CELL?A cell is the smallest unit that is capable of performing life functions
Nutrition
Reproduction
Responsiveness
Cell Structure• All Cells have:
an outermost plasma membrane
cytoplasm, the region where chemical reactions take place. Comprises cytosol and the organelles.
genetic material in the form of DNA
Cell Structure
• All Cells have:an outermost plasma membrane
• Structure – phospholipid bilayer with embedded proteins
• Function – isolates cell contents, controls what gets in and out of the cell, receives signals
Cell Structure
• All Cells have:genetic material in the form of DNA
• Eukaryotes – DNA is within a membrane (nucleus)
• Prokaryotes – no membrane around the DNA (DNA region called nucleoid)
Cell Structure
• All Cells have:cytoplasm with organelles
• Cytoplasm – fluid area, gel-like, inside outer plasma membrane and outside DNA region
• Organelles – is a specialized subunit within a cell that has a specific function, and it is usually separately enclosed within its own lipid membrane
Eukaryotes cellscells that contain nuclei
Eukaryotic Cells• Structures in all eukaryotic cells
– Nucleus– Ribosomes– Endomembrane system
• Endoplasmic reticulum – smooth and rough• Golgi apparatus• Vesicles• Lysosome
– Mitochondria– Chloroplast– Cytoskeleton
Cell boundaries 1• Cell membrane Thin, flexible membrane that
surrounds the cell.
Cell Membrane - structure✔ Lipid Bilayer:
• Double-layered sheet of phospholipids.• Membrane protein.• Glycoside.
Cell Membrane - structure Anchoring the
cytoskeleton to provide shape to the cell, and in attaching to the extracellular matrix and other cells to help group cells together to form tissues.
Responsiveness.
13/04/23
Outer membrane of cell that controls movement in and out of the cell (selectively
permeable).
Cell membrane - funtion
• Passive transport (Facilitated diffusion) – when the plasma membrane “helps” particles pass through protein channels.
No energy used
Cell membrane - funtion• Active transport – when the plasma
membrane uses energy to move particles against a concentration gradient.
•Cell walls Rigid layer around the membrane found only in bacteria, fungi and plants.
Cell boundaries 2
Cytoplasm• Area enclosed within the cell membrane.• Contains hyaloplasm or cytosol: jelly-like
mixture of cytoskeleton filaments, dissolved molecules, and water (80%).
• Contains all the organelles.• It is within the cytoplasm that most cellular
activities occur, such as many metabolic pathways.
Mitochondrion
• Produces energy through chemical reactions – breaking down fats & carbohydrate
Chloroplast
• Contains green chlorophyll• Where photosynthesis takes place
RE and Golgi apparatus
Endoplasmic reticulum• Moves
materials around in cell:
• Lipids and carbohydrates in smooth type
• Proteins in rough type
Golgi apparatus
• Protein 'packaging plant'• Move materials within the cell and out
of the cell by using vesicles
Vacuole
• Membrane-bound sacs for storage, digestion, and waste removal
• Help plants maintain shape
Lysosome• Vesicles containing enzymes, which are capable of
breaking down virtually all kinds of biomolecules.• Transports undigested material to cell membrane
for removal
RibosomesMolecular complex of protein synthesis (translation).Found on rough endoplasmic reticulum (RER) and
floating throughout the cell.Consist of two components:
• small ribosomal subunit which reads the RNA• large subunit which joins amino acids to form a
polypeptide chain. It is composed of: ribosomal RNA (rRNA) and a
variety of proteins.
Cytoskeleton Support organelles and cell shape
Place a role in cell motion
Centrioles
Lead cromosomes movement during cell division
Control flagella and cilia vibration
Nucleus• Nuclear membrane, lipid bilayer. • Contains genetic material – DNA.• Nucleolus: rRNA, ribosomal proteins, immature ribosomes.
Cell division
MITOSISDivisión por mitosis - Manuel Antonio Medina
Stages of mitosis – McGraw-Hill
Fases de la mitosis – John Kyrk
http://www.juntadeandalucia.es/averroes/manuales/materiales_tic/Cell_anim_archivos/Cell_anim_archivos/mitosis_Medina.swf
http://www.juntadeandalucia.es/averroes/manuales/materiales_tic/Cell_anim_archivos/Cell_anim_archivos/mitosis_citoknsMCGRAW.swf
http://www.johnkyrk.com/mitosis.html
13/04/23
13/04/23
MEIOSISDivisión por meiosis – Manuel Antonio Medina http://www.juntadeandalucia.es/averroes/manuales/materiales_tic/Cell_anim_archivos/Cell_anim_archivos/meiosis_Medina.swf
Stages of meiosis – McGraw-Hillhttp://www.juntadeandalucia.es/averroes/manuales/materiales_tic/Cell_anim_archivos/Cell_anim_archivos/meiosisMcGraw.swf
Fases de la meiosis – John Kyrkhttp://www.johnkyrk.com/meiosis.html
http://es.allreadable.com/5d90GNE COMPARACIÓN MITOSIS-MEIOSIS