Thin hollow cylinders made of protein that provide structural support for eukaryotic cells are microtubules. Microtubules are involved in nuceic and cell division, organization of intracellular structure, and intracellular transport, as well as ciliary and flagellar motility.
Microfilaments
There are two types of proteins that make up the cytoskeleton. Microtubules and microfilaments. Since you asked what the "fibers" are I assume you are talking about the microfilaments.
microtubules
Cytoskeleton.
tubulin
microtubules
microtubules
protein
Yes, microtubules are polimers of two proteins-alpha and beta tubulin and they have cylinder shape, which is empty inside. I wouldn't say they are thin, though, in comparison to other cytoskeleton components they are quite big in both diameter and lenght.
Chromosomes are made of protein and DNA.
True
True
Yes, it is true
True
Cilia and flagella are made of dynins and nexin proteins. Cilia and flagella are made up of microtubules and they are long, wispy tentecles that resemble hair.
microtubules
Cytoskeleton is completely made up of proteins.Micro tubules are hollow protein structures.
microtubules
protein
microtubules
The thin myofilament of skeletal muscles is made of the globular protein called actin.
Scuba diving tanks or cylinders are usually made of steel or aluminium. You can also get light weight high pressure cylinders made out of thin aluminium with carbon fibre on the top. These are often used by fire fighters.