Question

Which of the following cell structures do not contain protein tubulin?

• A. Centrioles.
• B. Endoplasmic reticulum.
• C. Cilia.
• D. Flagella.

Answer 1

The correct option is B Endoplasmic reticulum.

Centrioles are present in animal cells as a pair. They are made of microtubules. The microtubules are made of protein units called $\alpha$ tubulin and $\beta$ tubulin.

Centrioles form the basal body in both cilia and flagella.

Hence, protein tubulin is present in Centrioles, Cilia and flagella.

Endoplasmic reticulum is made of selectively permeable membrane similar to plasma membrane and hence, not associated with tubulin.

So, the correct answer is 'Endoplasmic reticulum.'