Question

The smallest cell organelle is

• A. Mitochondria
• B. Microfilament
• C. Microtubule
• D. Ribosome

Answer 1

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.