Which component is not a membrane-bound organelle?

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Prepare for the VCE Biology Unit 1 AOS 1 Test with flashcards and multiple choice questions. Understand key concepts and receive question explanations. Ace your exam!

Multiple Choice

Which component is not a membrane-bound organelle?

Explanation:
The main idea here is recognizing which cellular components are enclosed by a phospholipid membrane. The Golgi apparatus, mitochondria, and rough endoplasmic reticulum each have their own membranes, creating distinct internal spaces and enabling specialized functions within the cell. A ribosome, on the other hand, is not surrounded by a membrane. It’s a ribonucleoprotein complex that carries out protein synthesis and can be free in the cytosol or attached to the rough ER, but it itself isn’t a membrane-bound organelle. So the component that is not membrane-bound is the ribosome.

The main idea here is recognizing which cellular components are enclosed by a phospholipid membrane. The Golgi apparatus, mitochondria, and rough endoplasmic reticulum each have their own membranes, creating distinct internal spaces and enabling specialized functions within the cell. A ribosome, on the other hand, is not surrounded by a membrane. It’s a ribonucleoprotein complex that carries out protein synthesis and can be free in the cytosol or attached to the rough ER, but it itself isn’t a membrane-bound organelle. So the component that is not membrane-bound is the ribosome.

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