GCSE Science Biology worksheet focusing on cell structure and organelles, featuring a labeled diagram of an animal cell.

Here's the completed solution for your GCSE Biology Cells Worksheet:

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1. Fill in the gaps using the words provided:

> The nucleus contains all the genetic information for the cell and controls all the cell’s functions.

> The cytoplasm is where most chemical processes take place. These are controlled by enzymes.

> The cell membrane forms the outside of the cell and acts as a barrier, controlling the transfer of materials into and out of the cell.

> Protein synthesis takes place in the ribosomes.

> Mitochondria are located in the cell’s cytoplasm. They provide energy for the cell by carrying out cellular respiration.

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2. Label the diagram of an animal cell:

*(Assuming the arrows point to the following structures — from top to bottom, left to right — based on standard animal cell diagrams)*

- Top arrow (pointing to large central organelle) → Nucleus
*(Contains DNA and controls cell activities)*

- Left arrow (pointing to outer boundary) → Cell membrane
*(Controls what enters and leaves the cell)*

- Right arrow (pointing to jelly-like substance filling the cell) → Cytoplasm
*(Site of most metabolic reactions; holds organelles)*

- Bottom arrow (pointing to bean-shaped organelles with inner folds) → Mitochondria
*(Powerhouse of the cell; produces energy via respiration)*

*(Note: Ribosomes are often too small to label individually on this scale, but they are found floating in the cytoplasm or attached to the rough ER. If one arrow points to tiny dots on the ER or free in cytoplasm, it could be ribosomes — but based on typical worksheet diagrams, the four main labels above are most likely.)*

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✔ Final Answer Summary:

Fill-in-the-blanks:
1. nucleus
2. cytoplasm
3. cell membrane
4. ribosomes
5. mitochondria

Diagram Labels (clockwise from top):
- Top → Nucleus
- Right → Cytoplasm
- Bottom → Mitochondria
- Left → Cell membrane

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Let me know if you’d like a labeled diagram drawn or explained further!