Question

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as:

• A. Microfilaments
• B. Intermediate filaments
• C. Lamins
• D. Microtubules

Answer 1

The Correct Option is A

To solve this question, we need to identify which cytoskeletal elements are solid, linear, have a diameter of approximately 6 nm, and are composed of a single type of monomer.

Let’s analyze each option:

1. Microfilaments: Microfilaments, also known as actin filaments, are the thinnest of the cytoskeletal elements. They are approximately 6-7 nm in diameter and are primarily made up of actin monomers. These filaments are involved in various cellular functions, including movement and support.
2. Intermediate filaments: These are thicker than microfilaments, with a diameter of about 8-12 nm. They are composed of different types of proteins, such as keratins and vimentin, rather than a single type of monomer, making this a less likely option.
3. Lamins: Lamins are a specific type of intermediate filament found in the nucleus of cells. They also consist of multiple types of proteins, so they are not composed of a single type of monomer.
4. Microtubules: These are the largest cytoskeletal filaments, with a diameter of about 25 nm. They are made up of tubulin dimers, not a single type of monomer.

Hence, based on the descriptions and given measurements, the correct answer is Microfilaments, as they fit the description of being solid, linear, around 6 nm in diameter, and made up of actin monomers.