Pratica di Shadowing: Biology: Cell Structure I Nucleus Medical Media - Impara a parlare inglese con i 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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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione di livello C1 si basa sul video “Biology: Cell Structure I Nucleus Medical Media”. Le parole che ritornano più spesso: cell, organelle, nucleus, plant, material. Questo video contiene 62 frasi e 728 parole da ripetere con lo shadowing. Il parlato dura 6:54. Chi parla lo fa lentamente, circa 105 parole al minuto, quindi c’è tempo per imitare ogni suono. Solo il 72% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
Le 15 parole più avanzate del video, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| nucleus sostantivo | /ˈnuː.kli.əs/ | nucleo |
| ribosome sostantivo | /ˈɹaɪbəˌsoʊm/ | ribosoma |
| membrane sostantivo | /ˈmɛm.bɹeɪn/ | membrana |
| cytoplasm sostantivo | /ˈsaɪtəʊˌplæzəm/ | citoplasma |
| mitochondrion sostantivo | /ˌmaɪtəˈkɑndɹiən/ | mitocondrio |
| organism sostantivo | /ˈɔɹ.ɡəˌnɪz.əm/ | organismo |
| chloroplast sostantivo | /ˈklɔːɹəʊˌplæst/ | cloroplasto |
| enclose verbo | /ɪnˈkloʊz/ | cintare |
| eukaryotic aggettivo | eucariotico | |
| prokaryotic aggettivo | procariotico | |
| reticulum sostantivo | reticolo | |
| attach verbo | /əˈtæt͡ʃ/ | legare, appiccare |
| bacterium sostantivo | /bækˈtɪəɹ.ɪəm/ | batterio |
| cytoskeleton sostantivo | citoscheletro | |
| lysosome sostantivo | /ˈlaɪsəˌsoʊm/ | lisosoma |
I phrasal verb che sentirai
| Parola | Significato |
|---|---|
| wear out verbo | fare fuori, consumare |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Frasi relative who / which + frase — un’informazione in più su una persona o una cosa | cytoplasm, which is · nucleolus, which is · microfilaments, which are |
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | are made · are filled · is lined |
Pronuncia a cui fare attenzione
Chi parla usa 3 contrazioni e forme ridotte, come doesn't, don't, they're. Pronunciale nella forma breve, così come le senti.
- I suoni “th”: synthesize /ˈsɪnθəsaɪz/, photosynthesis /ˌfoʊ.toʊˈsɪn.θə.sɪs/
- I suoni “sh” e “zh”: respiration /ɹɛspɪˈɹeɪʃən/, specialize /ˈspɛʃəˌlaɪz/, projection /pɹəˈd͡ʒɛkʃən/
- Parole lunghe — attenzione all’accento: cytoplasm /ˈsaɪtəʊˌplæzəm/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, organism /ˈɔɹ.ɡəˌnɪz.əm/, unicellular /ˌjuːnɪˈsɛljʊlə(ɹ)/, abbreviate /əˈbɹi.vi.eɪt/
I suoni difficili per chi parla italiano:
- /h/ — va soffiata, non è muta: carbohydrate /kɑɹboʊˈhaɪdɹeɪt/, inhale /ɪnˈheɪl/, hollow /ˈhɑloʊ/
- Consonante finale — senza aggiungere una vocale dopo: nucleus /ˈnuː.kli.əs/, chloroplast /ˈklɔːɹəʊˌplæst/, enclose /ɪnˈkloʊz/, attach /əˈtæt͡ʃ/, synthesize /ˈsɪnθəsaɪz/
- /æ/ — più aperta della “e”: cytoplasm /ˈsaɪtəʊˌplæzəm/, chloroplast /ˈklɔːɹəʊˌplæst/, attach /əˈtæt͡ʃ/, bacterium /bækˈtɪəɹ.ɪəm/, vacuole /ˈvækjʊˌəʊl/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Fai shadowing frase per frase a velocità normale, ripetendo ognuna finché il tuo ritmo coincide con quello di chi parla.
- Registrati e confronta con l’originale, facendo attenzione a parole come nucleus, ribosome, membrane.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.