Pratica di Shadowing: Parts of the Eukaryotic Cell - Impara a parlare inglese con i video
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All cells
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have a few things in common, including the cell membrane.
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Cell membranes and all membrane-bound organelles are made up almost entirely of lipids.
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Lipids are a broad category of fatty macromolecules, which include oils, waxes, triglycerides, and phospholipids.
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Phospholipids are the major component of cell membranes and membrane-bound organelles.
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Triglycerides are fats and oils, also known as saturated and unsaturated fats.
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Waxes, like your earwax, are protective, lubricating substances.
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And sterols, like cholesterol or steroids, are used for cell wall integrity and for making hormones.
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So let's look at the cell membrane up close and see some of those lipids in action.
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The cell membrane is made mostly of phospholipids, which form a double layer called the phospholipid bilayer.
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The round heads of the phospholipids are polar and hydrophilic, which means that they are water-loving.
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The tails are nonpolar or hydrophobic, which means they are water-fearing.
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This is why they form a bilayer, which keeps the polar heads in the water and the nonpolar tails away from it.
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Another lipid, cholesterol, is a key part of the cell membrane, keeping it together while still allowing the proteins to move around.
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There are three basic types of membrane proteins as well.
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Recognition proteins, which tell the cell who it is and where it is.
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Receptor proteins, which can pick up signals.
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And transport proteins, which can move chemicals in and out of the cell.
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Those three proteins are also integral proteins because they're integrated into the lipid bilayer.
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This pink-colored protein that's on the edge of the membrane is called a peripheral protein, just like your peripheral vision is at the edge of your vision, peripheral proteins on the edge of the membrane.
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The proteins all create a speckled mosaic appearance on the membrane, but they aren't locked into one place.
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They can move around through the phospholipids.
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Because of this, we say the cell membrane is a fluid mosaic.
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The mitochondria are sometimes called the powerhouse of the cell.
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They transfer energy from organic molecules into ATP, which powers almost all reactions in the cell.
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Because mitochondria are the energy producers, you can expect to find more mitochondria in cells that do more work, like muscle cells.
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The mitochondria has an outer and an inner membrane.
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The inner membrane is bunched and folded, and the folds are called cristae.
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Inside the cristae, and between the inner and outer membrane, is a fluid called the matrix.
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Because mitochondria are small and also have their own DNA, some scientists think that mitochondria may have developed from prokaryotes like bacteria.
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Ribosomes are small structures that are responsible for building protein.
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They have no membrane like other organelles and are just made of protein and RNA.
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You can find ribosomes on the rough ER or floating around in the cytoplasm.
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The endoplasmic reticulum is a transportation highway which has two parts, rough and smooth.
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The rough ER produces phospholipids in proteins and is covered in ribosomes.
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The smooth ER produces lipids, such as cholesterol.
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You can tell it apart from the rough ER because it has no ribosomes on it and it's more tubular than flat.
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The Golgi apparatus, which is also known as the Golgi body, modifies many cellular products that it receives from the endoplasmic reticulum,
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and it prepares them for export to other regions of the cell or out of the cell entirely.
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You can tell the Golgi apparatus from the ER
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because it doesn't have ribosomes on it and it's further away from the nucleus.
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Lysosomes are vesicles that are made from the Golgi apparatus that contain digestive enzymes.
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These enzymes will help break down unwanted substances.
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The cytoskeleton is a network of tubes and filaments that give shape and structure to the cell, just like your bones give your body shape and structure.
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Centrioles are short cylinders of microtubules that exist in pairs
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and are used in animal cells to organize microtubules during cell division so that the chromosomes will divide evenly.
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This cell image has a flagella, which is a long whip-like tail for motion, but it doesn't have any cilia.
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Cilia are smaller versions of flagella and they can be used for propulsion
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or as a way to increase surface area for things like absorbing food in your intestines.
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The nucleus contains the DNA, but it's actually made of three more specific parts.
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The nuclear membrane is a double membrane that has little pores
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that provide passageways for RNA and other materials to go in and out, but the pores aren't big enough for the DNA to move out.
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Inside the nucleus is the DNA in the form of a thread-like material called chromatin.
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has the instructions for the structure and function of the organism.
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The nucleolus is the dense, round area in the nucleus, where the DNA is concentrated to build ribosomes.
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So those are the parts of the eukaryotic cell that most have in common.
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Next time we'll look at special parts that the plant cells have in addition to these.
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Thank you.
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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione di livello C1 si basa sul video “Parts of the Eukaryotic Cell”. Le parole che ritornano più spesso: cell, membrane, protein, phospholipid, lipid. Questo video contiene 58 frasi e 847 parole da ripetere con lo shadowing. Il parlato dura 5:32. Chi parla ha un ritmo naturale di circa 153 parole al minuto, vicino a una conversazione quotidiana. Solo il 73% 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 |
|---|---|---|
| membrane sostantivo | /ˈmɛm.bɹeɪn/ | membrana |
| phospholipid sostantivo | /ˌfɑs.foʊˈlɪ.pɪd/ | fosfolipide |
| lipid sostantivo | /ˈlɪpɪd/ | lipide |
| mitochondrion sostantivo | /ˌmaɪtəˈkɑndɹiən/ | mitocondrio |
| ribosome sostantivo | /ˈɹaɪbəˌsoʊm/ | ribosoma |
| nucleus sostantivo | /ˈnuː.kli.əs/ | nucleo |
| peripheral aggettivo | /pəˈɹɪf(ə)ɹ(ə)l/ | periferico |
| cholesterol sostantivo | /kəˈlɛstəɹɒl/ | colesterolo |
| apparatus sostantivo | /ˌæp.əˈɹeɪ.təs/ | impianto, attrezzatura |
| cilium sostantivo | /ˈsɪl.i.əm/ | ciglio |
| microtubule sostantivo | microtubulo | |
| pore sostantivo | /poɹ/ | poro |
| reticulum sostantivo | reticolo | |
| triglyceride sostantivo | /tɹaɪˈɡlɪsəɹaɪd/ | trigliceride |
| mosaic sostantivo | /moʊˈzeɪ.ɪk/ | mosaico |
I phrasal verb che sentirai
| Parola | Pronuncia | Significato |
|---|---|---|
| make up verbo | /ˌmeɪk ˈʌp/ | comporsi |
| pick up verbo | tirare su, sollevare |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | are made · are used · is made |
| Frasi relative who / which + frase — un’informazione in più su una persona o una cosa | hydrophilic, which means · hydrophobic, which means · proteins, which can |
Pronuncia a cui fare attenzione
Chi parla usa 6 contrazioni e forme ridotte, come aren't, doesn't, they're. Pronunciale nella forma breve, così come le senti.
- Parole lunghe — attenzione all’accento: phospholipid /ˌfɑs.foʊˈlɪ.pɪd/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, peripheral /pəˈɹɪf(ə)ɹ(ə)l/, cholesterol /kəˈlɛstəɹɒl/, apparatus /ˌæp.əˈɹeɪ.təs/
I suoni difficili per chi parla italiano:
- /h/ — va soffiata, non è muta: hydrophobic /haɪdɹəˈfoʊbɪk/, hormone /ˈhoɹmoʊn/
- Consonante finale — senza aggiungere una vocale dopo: phospholipid /ˌfɑs.foʊˈlɪ.pɪd/, lipid /ˈlɪpɪd/, nucleus /ˈnuː.kli.əs/, apparatus /ˌæp.əˈɹeɪ.təs/, triglyceride /tɹaɪˈɡlɪsəɹaɪd/
- /æ/ — più aperta della “e”: apparatus /ˌæp.əˈɹeɪ.təs/, bacterium /bækˈtɪəɹ.ɪəm/, cytoplasm /ˈsaɪtəʊˌplæzəm/, earwax /ˈiɹ.wæks/, macromolecule /ˈmækɹəʊˌmɒlɪkjuːl/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come membrane, phospholipid, lipid.
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.