Worksheet for labeling the parts of an animal cell, ideal for biology education.

The task is to label the parts of an animal cell based on the descriptions provided. Below is the solution with explanations for each part:

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1. Nucleus

- Description: Contains the organism's DNA and controls the production of ribosomes and proteins.
- Label: The large, central structure in the cell that contains a nucleolus (a dense region within it).

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2. Rough Endoplasmic Reticulum (RER)

- Description: Creates protein and has attached ribosomes.
- Label: The network of flattened sacs with small dots (ribosomes) attached to its surface.

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3. Smooth Endoplasmic Reticulum (SER)

- Description: Lacks ribosomes and aids in modifying proteins synthesized by the rough endoplasmic reticulum.
- Label: The network of flattened sacs without ribosomes attached.

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4. Golgi Apparatus

- Description: These flattened sacs aid in sorting proteins produced in the rough endoplasmic reticulum.
- Label: The stack of flattened sacs near the nucleus.

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5. Mitochondria

- Description: Produces ATP from broken food molecules and stores it until needed. They are commonly referred to as the "powerhouse of the cell."
- Label: The bean-shaped structures with inner folds (cristae).

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6. Lysosome

- Description: Contains digestive enzymes that break down unnecessary components of the cell and has the ability to kill bacteria that attack the body.
- Label: The small, round structures containing dots or stars (representing enzymes).

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7. Vacuoles

- Description: Membrane-bound sacs within cells that serve as storage units for various materials.
- Label: The small, round structures scattered throughout the cell.

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8. Cell Membrane

- Description: Thin outer covering that separates the contents of a cell from other cells and regulates the passage of materials in and out of the cell.
- Label: The outer boundary of the cell.

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9. Cytoplasm

- Description: Gel-like substance that fills the cell and maintains its shape. It is called the cytoplasm.
- Label: The entire area inside the cell membrane but outside the nucleus, where all organelles are located.

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Final Answer:

- Nucleus: Central structure with a nucleolus.
- Rough Endoplasmic Reticulum: Network with ribosomes.
- Smooth Endoplasmic Reticulum: Network without ribosomes.
- Golgi Apparatus: Stack of flattened sacs.
- Mitochondria: Bean-shaped structures with inner folds.
- Lysosome: Small, round structures with enzymes.
- Vacuoles: Small, round storage sacs.
- Cell Membrane: Outer boundary of the cell.
- Cytoplasm: Gel-like substance filling the cell.

Final Answer:
\boxed{
\text{Nucleus, Rough Endoplasmic Reticulum, Smooth Endoplasmic Reticulum, Golgi apparatus, Mitochondria, Lysosome, Vacuoles, Cell Membrane, Cytoplasm}
}