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Learn: Cells as the Basic Unit of Life
OCR GCSE Combined Science J250
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Welcome!I've reviewed your growth area on understanding cells as the basic unit of life. This lesson is designed to help you build a strong foundation in this topic with engaging explanations and practice questions.
What are cells?Cells are the basic units of life. They are the smallest structures capable of carrying out all the processes needed for life, such as growth, reproduction, and responding to the environment. All organisms, whether unicellular or multicellular, are made up of cells.
Types of cellsThere are two main types of cells: prokaryotic cells (e.g., bacteria) and eukaryotic cells (e.g., animal and plant cells). Prokaryotic cells are simpler and lack a nucleus, while eukaryotic cells have a nucleus and other specialised structures called organelles.
Which type of cell has a nucleus?
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Key organelles in eukaryotic cellsEukaryotic cells contain organelles, each with a specific function. For example, the nucleus stores genetic information, the mitochondria generate energy, and the cell membrane controls what enters and exits the cell.
The {{blank0}} contains genetic material, while the {{blank1}} is responsible for energy production.
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Animal vs Plant CellsBoth animal and plant cells are eukaryotic, but plant cells have unique features such as a cell wall (for structure), chloroplasts (for photosynthesis), and a large vacuole (for storage). Animal cells lack these structures.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! We've covered the basic structure of cells, types of cells, and key organelles. Now let's test your understanding with a few questions.
Which of the following are found in plant cells but not animal cells? (Select all that apply)
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Plant cells use {{blank0}} to make food during photosynthesis, while animal cells rely on {{blank1}} for energy.
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Which organelle acts as the control centre of the cell?
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Well done!You’ve completed this lesson on cells as the basic unit of life. Keep practising to strengthen your understanding further!
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