쉐도잉 연습: Parts of the Eukaryotic Cell - 영상으로 영어 말하기 배우기
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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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이 레슨의 어휘와 말하기 포인트
이 C1 수준 말하기 레슨은 영상 “Parts of the Eukaryotic Cell”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: cell, membrane, protein, phospholipid, lipid. 이 영상에는 섀도잉할 문장 58개와 단어 847개가 있습니다. 말하는 구간의 길이는 5:32입니다. 화자는 분당 약 153단어로, 일상 대화에 가까운 자연스러운 속도로 말합니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 73%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에서 가장 어려운 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| membrane 명사 | /ˈmɛm.bɹeɪn/ | 막 |
| lipid 명사 | /ˈlɪpɪd/ | 지질 |
| mitochondrion 명사 | /ˌmaɪtəˈkɑndɹiən/ | 미토콘드리아, 사립체 |
| nucleus 명사 | /ˈnuː.kli.əs/ | 핵심, 핵 |
| organelle 명사 | /ˌɔɹ.ɡənˈɛl/ | 세포소기관 |
| cholesterol 명사 | /kəˈlɛstəɹɒl/ | 콜레스테롤, 콜레스테린 |
| apparatus 명사 | /ˌæp.əˈɹeɪ.təs/ | 장치 |
| pore 명사 | /poɹ/ | 기공 |
| reticulum 명사 | 벌집위 | |
| mosaic 명사 | /moʊˈzeɪ.ɪk/ | 모자이크 |
| enzyme 명사 | /ˈɛn.zaɪm/ | 효소 |
| wax 명사 | /waks/ | 밀랍, 왁스 |
| fold 동사 | /ˈfəʊld/ | 개다, 접다 |
| bacterium 명사 | /bækˈtɪəɹ.ɪəm/ | 세균, 박테리아 |
| chromosome 명사 | /ˈkɹoʊməˌsoʊm/ | 염색체, 물들체 |
영상에 나오는 구동사
| 단어 | 뜻 |
|---|---|
| pick up 동사 | 줍다 |
이 영상의 문법
화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.
| 문형 | 영상 속 표현 |
|---|---|
| 수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점 | are made · are used · is made |
| 관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보 | hydrophilic, which means · hydrophobic, which means · proteins, which can |
주의할 발음
화자는 aren't, doesn't, they're 같은 축약형과 약화된 형태를 6번 사용합니다. 들리는 대로 짧게 발음하세요.
- 긴 단어 — 강세 위치에 주의: phospholipid /ˌfɑs.foʊˈlɪ.pɪd/, mitochondrion /ˌmaɪtəˈkɑndɹiən/, peripheral /pəˈɹɪf(ə)ɹ(ə)l/, cholesterol /kəˈlɛstəɹɒl/, apparatus /ˌæp.əˈɹeɪ.təs/
한국어 화자가 어려워하는 소리:
- /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: phospholipid /ˌfɑs.foʊˈlɪ.pɪd/, peripheral /pəˈɹɪf(ə)ɹ(ə)l/, flagellum /fləˈd͡ʒɛləm/, fold /ˈfəʊld/, filament /ˈfɪləmənt/
- /v/ — ㅂ(/b/)과 구별하기: digestive /daɪˈdʒɛstɪv/, vesicle /ˈvɛsɪkəl/, evenly /ˈiːvənli/
- /z/ — ㅈ이 아니라 성대를 울리는 /s/: mosaic /moʊˈzeɪ.ɪk/, enzyme /ˈɛn.zaɪm/, cytoplasm /ˈsaɪtəʊˌplæzəm/, organism /ˈɔɹ.ɡəˌnɪz.əm/, organize /ˈɔɹɡənaɪz/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
- 자신의 목소리를 녹음해 원본과 비교하고, membrane, lipid, mitochondrion 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.