Question

multiple choice question
microtubules and intermediate filaments make up the ______.

nucleus
mitochondrion
smooth er
cytoskeleton

Explanation:

To solve this, we analyze each option:

• Nucleus: Contains genetic material, not made of microtubules/intermediate filaments.
• Mitochondrion: Produces energy, its structure doesn't include these filaments.
• Smooth ER: Involved in lipid synthesis, not composed of microtubules/intermediate filaments.
• Cytoskeleton: The cytoskeleton of a cell is made up of microtubules, intermediate filaments, and microfilaments. So microtubules and intermediate filaments are part of the cytoskeleton.

Answer:

D. cytoskeleton