Transportation of Molecules Through the Nuclear Envelope Quiz

Which molecules can passively diffuse through nuclear pore complexes?

Small molecules

Which type of transport is energy-dependent?

Transport through nuclear pore complexes

Which proteins are selectively imported into the nucleus?

Histones

What are Nuclear Localization Signals (NLS)?

Short amino acid sequences Signup and view all the answers

What recognizes Nuclear Localization Signals (NLS)?

Cytosolic receptor protein Signup and view all the answers

How do protein-receptor complexes move along the nuclear pore complex?

By repeatedly binding and dissociating Signup and view all the answers

What happens to importin after releasing its cargo in the nucleoplasm?

It is transported back to the cytosol Signup and view all the answers

What happens to ran GTP in the cytoplasm?

It is converted into ran GDP Signup and view all the answers

What serves as binding sites for import receptors in the nuclear pore complex?

Nucleoporins Signup and view all the answers

What is responsible for promoting the hydrolysis of ran GTP to GDP?

Ran GAP Signup and view all the answers

Which protein drives directional transport through nuclear pore complexes?

Ran GTPase Signup and view all the answers

What provides the energy for the translocation of proteins through the nuclear pore complex?

Hydrolysis of GTP Signup and view all the answers

Which proteins promote the conversion of Ran GDP to Ran GTP and vice versa?

GEF and GAP Signup and view all the answers

What is the role of nuclear export proteins?

To export RNA's from the nucleus to the cytoplasm Signup and view all the answers

What are nuclear export signals (NES) and exportins?

Signals and receptors for nuclear export Signup and view all the answers

How are mature mRNA molecules transported across nuclear pores?

As RNA-protein complexes Signup and view all the answers

What determines whether an RNA molecule will leave the nucleus?

The entire set of bound proteins Signup and view all the answers

What happens to incompletely processed pre-mRNAs?

They are actively retained in the nucleus Signup and view all the answers

What serves as RNA export factors for mRNAs?

Proteins that mark completed splicing events Signup and view all the answers

What provides the energy for the export of all RNAs from the nucleus?

An active energy-dependent process Signup and view all the answers