Question

Microtubules are the constituents of

• A. Spindle fibres, Centrioles and Cilia
• B. Centrioles, spindle fibres and chromatin
• C. Centrosome, Nucleosome and Centrioles
• D. Cilia, Flagella and Peroxisomes

Answer 1

The Correct Option is A

The correct answer is:

Option 1: Spindle fibres, Centrioles and Cilia

Explanation:

Microtubules are a key component of the cytoskeleton in eukaryotic cells and have several important functions. Here’s how they are involved in the options provided:

Spindle fibers: Microtubules form the spindle fibers during cell division (mitosis and meiosis). These fibers help in the separation of chromosomes.

Centrioles: Centrioles are structures made up of microtubules. They are part of the centrosome and play a key role in organizing microtubules during cell division.

Cilia: Cilia are hair-like structures on the surface of some eukaryotic cells, composed of microtubules. They help in movement or fluid transport.

Therefore, microtubules are the constituents of spindle fibers, centrioles, and cilia, making Option 1 the correct answer.

Why other options are incorrect:

Option 2: Chromatin is not made of microtubules. Chromatin consists of DNA and proteins.

Option 3: Nucleosomes are composed of DNA and histone proteins, not microtubules.

Option 4: While microtubules are involved in cilia and flagella, peroxisomes are not made of microtubules; they are membrane-bound organelles.