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

1. Microtubules

2. Microfilaments

3. Intermediate filaments

4. Lamins

An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called:
1. Endoplasmic Reticulum
2. Plasmalemma
3. Cytoskeleton
4. Thylakoid

The cytoskeleton is made up of: