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Question

The smallest cell organelle is


A

Mitochondria

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B

Microfilament

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C

Microtubule

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D

Ribosome

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Solution

The correct option is D

Ribosome


The correct option is D

Explanation of the correct option:

  1. A ribosome is a small round organelle.
  2. Its diameter is about 20 nm.
  3. It is present on the Rough endoplasmic reticulum and is involved in protein synthesis.

Explanation of the incorrect option:

Option A:

  1. Mitochondria is a double membrane-bound organelle.
  2. Its size varies between 200-700nm.
  3. Its function is to produce energy in the form of ATP for the cell.

Option B:

  1. Microfilaments are double-stranded long protein molecules.
  2. They are present in bundles and are involved in muscle contraction and cell movement.

Option C:

  1. Microtubules are the largest filament about 25nm in diameter.
  2. They are made up of protein tubulin.

Final answer: The smallest cell organelle is the ribosome.


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