Bio 181 (Module 4: Self Check)

Molecular motors run on which two cytoskeletal filament systems?

Actin Filament System and Microtubule System

Cilia and microvilli contain a similar number of parallel actin filaments.

False

Heterochromatin does not exist in interphase nuclei.

False

The actin filament system extends outside of the cell.

False

The actin filament system is present in the nucleus.

False

The diameter of an intermediate filament is 25 nm.

False

Which cytoskeletal filament system lines the inside of the nucleus to protect it?

Intermediate filament system2

Where is the histone H1 found?

It is the "staple" used to bind together other histones which make up the nucleosomal core

Chromosomes are made out of Euchromatin.

True

Molecular motors use ATP as the energy source to power the molecular motors.

True

Naked DNA does not exist in Nature but scientists can make naked DNA in a test tube.

True

To get into the nucleus a component has to have the correct signal sequence and pass through a nuclear pore.

True

Consider the geography of cells. Actin filaments are present in the cell's ___ and the microtubules are present in the cell's .

cell cortex - cell interior

What does the nucleosomal core have in it (i.e., the basket ball like structure on the slides)?

two H2A two H2B two H3 two H4 combined by one H1