Shadowing-Übung: Biology: Cell Structure I Nucleus Medical Media - Englisch Sprechen Lernen mit Video
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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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Wortschatz und Sprechhinweise zu dieser Lektion
Diese Sprechübung auf Niveau C1 basiert auf dem Video „Biology: Cell Structure I Nucleus Medical Media“. Diese Wörter kommen am häufigsten vor: cell, organelle, nucleus, plant, material. Dieses Video enthält 62 Sätze und 728 Wörter zum Nachsprechen. Der gesprochene Teil dauert 6:54. Der Sprecher spricht langsam, etwa 105 Wörter pro Minute, sodass genug Zeit bleibt, jeden Laut nachzuahmen. Nur 72 % der Wörter gehören zu den 3.000 häufigsten im Englischen, der Wortschatz ist also anspruchsvoll.
Wichtiger Wortschatz in diesem Video
Die 15 anspruchsvollsten Wörter aus dem Video, mit Aussprache und Bedeutung:
| Wort | Aussprache | Bedeutung |
|---|---|---|
| organelle Substantiv | /ˌɔɹ.ɡənˈɛl/ | Organell, Organelle |
| nucleus Substantiv | /ˈnuː.kli.əs/ | Kern |
| ribosome Substantiv | /ˈɹaɪbəˌsoʊm/ | Ribosom |
| membrane Substantiv | /ˈmɛm.bɹeɪn/ | Membran, Membrane |
| cytoplasm Substantiv | /ˈsaɪtəʊˌplæzəm/ | Zytoplasma |
| flagellum Substantiv | /fləˈd͡ʒɛləm/ | Geißel, Flagellum |
| mitochondrion Substantiv | /ˌmaɪtəˈkɑndɹiən/ | Mitochondrium, Mitochondrion |
| organism Substantiv | /ˈɔɹ.ɡəˌnɪz.əm/ | Organismus, Lebewesen |
| chloroplast Substantiv | /ˈklɔːɹəʊˌplæst/ | Chloroplast |
| enclose Verb | /ɪnˈkloʊz/ | beifügen, einschliessen |
| endoplasmic Adjektiv | endoplasmatisch | |
| reticulum Substantiv | Retikulum | |
| attach Verb | /əˈtæt͡ʃ/ | anbringen |
| bacterium Substantiv | /bækˈtɪəɹ.ɪəm/ | Bakterium, Bakterie |
| cytoskeleton Substantiv | Zytoskelett |
Phrasal Verbs, die du hören wirst
| Wort | Bedeutung |
|---|---|
| break down Verb | versagen, den Geist aufgeben |
| wear out Verb | abnutzen, verschleißen |
Grammatik in diesem Video
Die Strukturen, die der Sprecher am häufigsten verwendet, mit den genauen Worten aus dem Video:
| Struktur | Im Video |
|---|---|
| Relativsätze who / which + Satz – eine Zusatzinformation über eine Person oder Sache | cytoplasm, which is · nucleolus, which is · microfilaments, which are |
| Passiv be + Partizip Perfekt – wichtig ist, was geschieht, nicht wer es tut | are made · are filled · is lined |
Aussprache, auf die du achten solltest
Der Sprecher verwendet 3 Kurzformen und abgeschwächte Formen, zum Beispiel doesn't, don't, they're. Sprich sie in der kurzen Form, so wie du sie hörst.
- Die „th“-Laute: synthesize /ˈsɪnθəsaɪz/, photosynthesis /ˌfoʊ.toʊˈsɪn.θə.sɪs/
- Die Laute „sh“ und „zh“: respiration /ɹɛspɪˈɹeɪʃən/, specialize /ˈspɛʃəˌlaɪz/, projection /pɹəˈd͡ʒɛkʃən/
- Lange Wörter – auf die Betonung achten: cytoplasm /ˈsaɪtəʊˌplæzəm/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, organism /ˈɔɹ.ɡəˌnɪz.əm/, unicellular /ˌjuːnɪˈsɛljʊlə(ɹ)/, abbreviate /əˈbɹi.vi.eɪt/
Laute, die Deutschsprachigen schwerfallen:
- /w/ — mit runden Lippen, nicht wie das deutsche „w“ (/v/): passageway /ˈpæ.sɪdʒˌweɪ/, wander /ˈwɑndɚ/
- Stimmhafter Auslaut — /b/, /d/, /g/, /z/, /v/ am Wortende nicht verhärten: enclose /ɪnˈkloʊz/, synthesize /ˈsɪnθəsaɪz/, customize /ˈkʌs.tə.maɪ̯z/, specialize /ˈspɛʃəˌlaɪz/, emerge /ɪˈmɝd͡ʒ/
- /æ/ — offener als „ä“: cytoplasm /ˈsaɪtəʊˌplæzəm/, chloroplast /ˈklɔːɹəʊˌplæst/, attach /əˈtæt͡ʃ/, bacterium /bækˈtɪəɹ.ɪəm/, vacuole /ˈvækjʊˌəʊl/
So übst du mit diesem Video
- Höre dir das ganze Video einmal an, ohne zu sprechen, und notiere die Wörter, die du nicht kennst.
- Sprich Satz für Satz in normaler Geschwindigkeit nach und wiederhole jeden, bis dein Rhythmus zum Sprecher passt.
- Nimm dich auf und vergleiche mit dem Original; achte dabei auf Wörter wie organelle, nucleus, ribosome.
Was ist die Shadowing-Technik?
Shadowing ist eine wissenschaftlich fundierte Sprachlerntechnik, die ursprünglich für die professionelle Dolmetscherausbildung entwickelt und durch den Polyglotten Dr. Alexander Arguelles populär gemacht wurde. Die Methode ist einfach aber wirkungsvoll: Du hörst englisches Audio von Muttersprachlern und wiederholst es sofort laut — wie ein Schatten, der dem Sprecher mit nur 1–2 Sekunden Verzögerung folgt. Anders als passives Hören oder Grammatikübungen zwingt Shadowing dein Gehirn und deine Mundmuskulatur, gleichzeitig echte Sprachmuster zu verarbeiten und zu reproduzieren. Studien zeigen, dass es Aussprachegenauigkeit, Intonation, Rhythmus, verbundene Sprache, Hörverständnis und Sprechflüssigkeit signifikant verbessert — was es zu einer der effektivsten Methoden für die IELTS Speaking-Vorbereitung und reale englische Kommunikation macht.