What is an Animal Cell? | Definition and Functions | Twinkl - Free Printable
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Step-by-step solution for: What is an Animal Cell? | Definition and Functions | Twinkl
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Show Answer Key & Explanations
Step-by-step solution for: What is an Animal Cell? | Definition and Functions | Twinkl
The image you've provided is a labeled diagram of an animal cell, showing various organelles and structures. Since there's no specific question posed in your message, I'll assume the task is to identify and explain the function of each labeled part in this animal cell diagram.
Here’s a detailed breakdown of each labeled structure and its role:
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- Function: Acts as a selective barrier that controls the movement of substances in and out of the cell. It maintains homeostasis by regulating what enters and exits the cell.
- Structure: A phospholipid bilayer with embedded proteins.
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- Function: The control center of the cell. Contains DNA (genetic material) and directs cellular activities such as growth, metabolism, and reproduction.
- Structure: Surrounded by the nuclear membrane; contains the nucleolus.
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- Function: Double membrane that surrounds the nucleus and separates it from the cytoplasm. It has nuclear pores that allow controlled passage of materials between the nucleus and cytoplasm.
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- Function: Site of ribosome synthesis. Produces ribosomal subunits that are exported to the cytoplasm to form functional ribosomes.
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- Function: Involved in protein synthesis. The "rough" appearance comes from ribosomes attached to its surface. Proteins made here are often destined for secretion or insertion into membranes.
- Structure: Network of membranous sacs with ribosomes.
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- Function: Lacks ribosomes. Involved in lipid synthesis, detoxification of drugs and poisons, and calcium storage (especially in muscle cells).
- Structure: Network of tubules without ribosomes.
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- Function: Modifies, sorts, and packages proteins and lipids for transport to their final destinations (e.g., secretion, lysosomes, or plasma membrane).
- Structure: Stack of flattened sacs.
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- Function: Known as the "powerhouse of the cell." Produces ATP (energy) through cellular respiration.
- Structure: Double-membraned organelle with inner folds called cristae.
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- Function: Contains digestive enzymes that break down waste materials, foreign particles, and cellular debris. Also involved in autophagy (recycling of damaged organelles).
- Structure: Small vesicles filled with hydrolytic enzymes.
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- Function: Stores water, ions, nutrients, and waste products. In animal cells, vacuoles are typically small and temporary, unlike in plant cells where they are large and central.
- Note: This is a small vacuole, typical of animal cells.
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- Function: Sites of protein synthesis. They read mRNA and assemble amino acids into polypeptide chains.
- Structure: Made of RNA and proteins. Found free in cytoplasm or attached to RER.
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- Function: Organizes microtubules during cell division (forms spindle fibers). Helps maintain cell shape and intracellular transport.
- Structure: Composed of two centrioles (not shown in detail here).
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- Function: Gel-like substance that fills the cell and suspends organelles. Provides a medium for biochemical reactions and supports organelle movement.
- Composition: Cytosol + organelles.
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Yes — this is clearly an animal cell because:
- It has a centrosome (common in animal cells but not in most plant cells).
- It lacks a cell wall and chloroplasts.
- It has lysosomes and centrioles.
- The vacuole is small and not central (unlike in plant cells).
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This diagram depicts a typical animal cell with all major organelles labeled. Each structure plays a vital role in maintaining cellular function, including energy production, protein synthesis, waste management, and genetic control.
If you had a specific question about this diagram (e.g., “Which organelle produces ATP?” or “What is the function of the Golgi apparatus?”), feel free to ask!
Here’s a detailed breakdown of each labeled structure and its role:
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1. Cell Membrane
- Function: Acts as a selective barrier that controls the movement of substances in and out of the cell. It maintains homeostasis by regulating what enters and exits the cell.
- Structure: A phospholipid bilayer with embedded proteins.
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2. Nucleus
- Function: The control center of the cell. Contains DNA (genetic material) and directs cellular activities such as growth, metabolism, and reproduction.
- Structure: Surrounded by the nuclear membrane; contains the nucleolus.
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3. Nuclear Membrane (Nuclear Envelope)
- Function: Double membrane that surrounds the nucleus and separates it from the cytoplasm. It has nuclear pores that allow controlled passage of materials between the nucleus and cytoplasm.
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4. Nucleolus
- Function: Site of ribosome synthesis. Produces ribosomal subunits that are exported to the cytoplasm to form functional ribosomes.
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5. Rough Endoplasmic Reticulum (RER)
- Function: Involved in protein synthesis. The "rough" appearance comes from ribosomes attached to its surface. Proteins made here are often destined for secretion or insertion into membranes.
- Structure: Network of membranous sacs with ribosomes.
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6. Smooth Endoplasmic Reticulum (SER)
- Function: Lacks ribosomes. Involved in lipid synthesis, detoxification of drugs and poisons, and calcium storage (especially in muscle cells).
- Structure: Network of tubules without ribosomes.
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7. Golgi Apparatus
- Function: Modifies, sorts, and packages proteins and lipids for transport to their final destinations (e.g., secretion, lysosomes, or plasma membrane).
- Structure: Stack of flattened sacs.
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8. Mitochondrion (plural: mitochondria)
- Function: Known as the "powerhouse of the cell." Produces ATP (energy) through cellular respiration.
- Structure: Double-membraned organelle with inner folds called cristae.
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9. Lysosome
- Function: Contains digestive enzymes that break down waste materials, foreign particles, and cellular debris. Also involved in autophagy (recycling of damaged organelles).
- Structure: Small vesicles filled with hydrolytic enzymes.
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10. Vacuole
- Function: Stores water, ions, nutrients, and waste products. In animal cells, vacuoles are typically small and temporary, unlike in plant cells where they are large and central.
- Note: This is a small vacuole, typical of animal cells.
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11. Ribosomes
- Function: Sites of protein synthesis. They read mRNA and assemble amino acids into polypeptide chains.
- Structure: Made of RNA and proteins. Found free in cytoplasm or attached to RER.
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12. Centrosome
- Function: Organizes microtubules during cell division (forms spindle fibers). Helps maintain cell shape and intracellular transport.
- Structure: Composed of two centrioles (not shown in detail here).
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13. Cytoplasm
- Function: Gel-like substance that fills the cell and suspends organelles. Provides a medium for biochemical reactions and supports organelle movement.
- Composition: Cytosol + organelles.
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Summary: Is This an Animal Cell?
Yes — this is clearly an animal cell because:
- It has a centrosome (common in animal cells but not in most plant cells).
- It lacks a cell wall and chloroplasts.
- It has lysosomes and centrioles.
- The vacuole is small and not central (unlike in plant cells).
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Final Answer:
This diagram depicts a typical animal cell with all major organelles labeled. Each structure plays a vital role in maintaining cellular function, including energy production, protein synthesis, waste management, and genetic control.
If you had a specific question about this diagram (e.g., “Which organelle produces ATP?” or “What is the function of the Golgi apparatus?”), feel free to ask!
Parent Tip: Review the logic above to help your child master the concept of all parts of an animal cell.
