Pratique du Shadowing: Biology: Cell Structure I Nucleus Medical Media - Apprendre l'anglais à l'oral avec la vidéo
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Cells are the smallest living units of an organism.
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All cells have three things in common, no matter what type of cell they are.
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All cells have a cell membrane, which separates the inside of the cell from its environment,
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cytoplasm, which is a jelly-like fluid, and DNA, which is the cell's genetic material.
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There are two broad categories of cells.
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The first category is eukaryotic cells.
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They have organelles, which include the nucleus and other special parts.
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Eukaryotic cells are more advanced, complex cells, such as those found in plants and animals.
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The second category is prokaryotic cells.
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They don't have a nucleus or membrane-enclosed organelles.
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They do have genetic material, but it's not contained within a nucleus.
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Prokaryotic cells are always one-celled or unicellular organisms, such as bacteria. So, what are organelles?
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Organelle means little organ.
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Organelles are the specialized parts of a cell that have unique jobs to perform.
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Let's start with the nucleus, the control center of the cell.
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The nucleus contains DNA, or genetic material.
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DNA dictates what the cell is going to do and how it's going to do it.
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Chromatin is the tangled, spread out form of DNA found inside the nuclear membrane.
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When a cell is ready to divide, DNA condenses into structures known as chromosomes.
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The nucleus also contains a nucleolus, which is a structure where ribosomes are made.
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After ribosomes leave the nucleus, they will have the important job of synthesizing or making proteins.
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Outside the nucleus, the ribosomes and the rest of the organelles float around in cytoplasm, which is the jelly-like substance.
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may wander freely within the cytoplasm or attach to the endoplasmic reticulum, sometimes abbreviated as ER.
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There are two types of ER.
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Rough ER has ribosomes attached to it, and smooth ER doesn't have ribosomes attached to it.
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The endoplasmic reticulum is a membrane-enclosed passageway for transporting materials, such as the proteins synthesized by ribosomes.
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Proteins and other materials emerge from the endoplasmic reticulum in small vesicles,
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where the Golgi apparatus, sometimes called the Golgi body, receives them.
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As proteins move through the Golgi body, they're customized into forms that the cell can use.
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The Golgi body does this by folding the proteins into usable shapes
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or adding other materials onto them such as lipids or carbohydrates.
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Vacuoles are sac-like structures that store different materials.
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Here in this plant cell, the central vacuole stores water.
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Going back to the animal cell, you will see an organelle called a lysosome.
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Lysosomes are the garbage collectors that take in damaged or worn out cell parts.
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They are filled with enzymes that break down this cellular debris.
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The mitochondrion is an organelle that is the powerhouse for both animal and plant cells.
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During a process called cellular respiration,
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the mitochondria make ATP molecules that provide the energy for all of the cell's activities.
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Cells that need more energy have more mitochondria.
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Meanwhile, the cell maintains its shape through a cytoskeleton.
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The cytoskeleton includes the thread-like microfilaments, which are made of protein,
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and microtubules, which are thin, hollow tubes.
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Some organisms, such as plants that are photoautotrophic, meaning they capture sunlight for energy,
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have cells with an organelle called a chloroplast.
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The chloroplast is where photosynthesis happens.
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It's green because it has a green pigment called chlorophyll.
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Plant cells also have a cell wall outside of their cell membranes that shape, support and protect the plant cell.
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Animal cells never have a cell wall.
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There are many other unique structures that only some cells have.
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Here are just a few.
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In humans, for example, the respiratory tract is lined with cells that have cilia.
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These are microscopic, hair-like projections that can move in waves.
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This feature helps trap inhaled particles in the air and expels them when you cough.
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Another unique feature in some cells is flagella.
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Some bacteria have flagella.
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A flagellum is like a little tail that can help a cell move or propel itself.
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The only human cell that has a flagellum is a sperm cell.
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In summary, remember, eukaryotic cells are plant and animal cells with a nucleus and membrane-enclosed organelles,
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while prokaryotic cells are unicellular organisms without these things.
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All cells have a cell membrane, cytoplasm, and genetic material.
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And even though only plant cells have chloroplasts, both plant and animal cells have mitochondria.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « Biology: Cell Structure I Nucleus Medical Media ». Les mots qui reviennent le plus souvent : cell, organelle, nucleus, plant, material. Cette vidéo contient 62 phrases et 728 mots à répéter en shadowing. La partie parlée dure 6:54. Le locuteur parle lentement, environ 105 mots par minute, ce qui laisse le temps d’imiter chaque son. Seuls 72 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| organelle nom | /ˌɔɹ.ɡənˈɛl/ | organite |
| nucleus nom | /ˈnuː.kli.əs/ | noyau |
| ribosome nom | /ˈɹaɪbəˌsoʊm/ | ribosome |
| membrane nom | /ˈmɛm.bɹeɪn/ | membrane |
| cytoplasm nom | /ˈsaɪtəʊˌplæzəm/ | cytoplasme |
| flagellum nom | /fləˈd͡ʒɛləm/ | flagelle |
| mitochondrion nom | /ˌmaɪtəˈkɑndɹiən/ | mitochondrie |
| organism nom | /ˈɔɹ.ɡəˌnɪz.əm/ | organisme |
| chloroplast nom | /ˈklɔːɹəʊˌplæst/ | chloroplaste |
| eukaryotic adjectif | eucaryote | |
| reticulum nom | réticulum, réseau | |
| attach verbe | /əˈtæt͡ʃ/ | attacher |
| bacterium nom | /bækˈtɪəɹ.ɪəm/ | bactérie |
| cytoskeleton nom | cytosquelette | |
| lysosome nom | /ˈlaɪsəˌsoʊm/ | lysosome |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| break down verbe | tomber en panne |
| wear out verbe | user |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Propositions relatives who / which + proposition — une précision sur une personne ou une chose | cytoplasm, which is · nucleolus, which is · microfilaments, which are |
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | are made · are filled · is lined |
Prononciation à surveiller
Le locuteur utilise 3 contractions et formes réduites, comme doesn't, don't, they're. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « th »: synthesize /ˈsɪnθəsaɪz/, photosynthesis /ˌfoʊ.toʊˈsɪn.θə.sɪs/
- Les sons « sh » et « zh »: respiration /ɹɛspɪˈɹeɪʃən/, specialize /ˈspɛʃəˌlaɪz/, projection /pɹəˈd͡ʒɛkʃən/
- Mots longs — placez bien l’accent: cytoplasm /ˈsaɪtəʊˌplæzəm/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, organism /ˈɔɹ.ɡəˌnɪz.əm/, unicellular /ˌjuːnɪˈsɛljʊlə(ɹ)/, abbreviate /əˈbɹi.vi.eɪt/
Les sons difficiles pour les francophones :
- /h/ — il se souffle, il n’est pas muet: carbohydrate /kɑɹboʊˈhaɪdɹeɪt/, inhale /ɪnˈheɪl/, hollow /ˈhɑloʊ/
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: flagellum /fləˈd͡ʒɛləm/, attach /əˈtæt͡ʃ/, jelly /ˈd͡ʒɛli/, passageway /ˈpæ.sɪdʒˌweɪ/, projection /pɹəˈd͡ʒɛkʃən/
- /r/ anglais — langue recourbée, sans frotter la gorge: organelle /ˌɔɹ.ɡənˈɛl/, ribosome /ˈɹaɪbəˌsoʊm/, membrane /ˈmɛm.bɹeɪn/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, organism /ˈɔɹ.ɡəˌnɪz.əm/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme organelle, nucleus, ribosome.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.