Arizona State University (ASU) BIO181 General Biology I Exam 1 Practice

Is the diameter of an intermediate filament 25 nm?

True False Dependent on the type Only during cell division

Correct Answer:

False

Explanation:

Intermediate filaments have a characteristic diameter of about 10 nanometers, not 25 nm. This size distinction is crucial in the classification of cytoskeletal elements in eukaryotic cells. The three main types of cytoskeletal components include microfilaments (around 7 nm in diameter), intermediate filaments, and microtubules (approximately 25 nm in diameter). Therefore, stating that the diameter of an intermediate filament is 25 nm is inaccurate, as it misrepresents its actual dimensions. Understanding the sizes and roles of these components is vital in cell biology, as they contribute to the structural integrity and mechanical support of the cells.

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