A cell is like a household

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Cell walls are like walls...

because they are both meant to protect the things that they surround.
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The nucleus is like a parent...

because the both control everything in their "castle".
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Plasma Membrane is like a front door...

because they let things in and keep stuff out.
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The capsule is like an alarm system...

because they both protect things from harm.
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Lysosomes are like toilets...

because they both dispose of waste.
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Mitochondria is like a kitchen...

because they both provide energy.