CH 9: The Nucleus - (Key Terms) Flashcards
Euchromatin
Decondensed, Transcriptionally ACTIVE Interphase
Exportin
A karyopherin that RECOGNIZES Nuclear Export Signals & DIRECTS Transport FROM the Nucleus to the Cytosol
Heterochromatin
Condensed, Transcriptionally INACTIVE Chromatin.
Karyopherin
a Nuclear Transport Receptor.
Lamin
an Intermediate Filament Protein that FORMS the Nuclear Lamina.
Nuclear Body
a Discrete Organelle w/in the Nucleus.
Nuclear Envelope
Barrier SEPARATING Nucleus from Cytoplasm, COMPOSED OF an (1) Inner + (2) Outer Membrane, a (3) Nuclear Lamina, & (4) Nuclear Pore Complexes.
Nuclear EXPORT Signal
Amino Acid sequence that TARGETS Proteins for Transport from the Nucleus to the Cytosol.
Nuclear Lamina
Meshwork of Lamin Filaments providing Structural Support to Nucleus.
Ran
Small GTP-Binding Protein involved in Nuclear Import + Export.
Replication Factory
Large Complex containing Clustered sites of DNA Replication in Eukaryotic Cells.
Small Nucleolar RNA (snoRNA)
Small RNA present in Nucleolus that functions in PRE-rRNA Processing.
Nucleolus
Nuclear site of rRNA Transcription, Processing, & Ribosome Assembly.
Nuclear Pore Complex
Large structure forming a Transport Channel THRU Nuclear Envelope.
Nuclear Transport Receptor
A protein that recognizes nuclear localization signals and mediates transport across the nuclear envelope.
Nucleolar Organizing Region
Chromosomal Region containing the Genes for Ribosomal RNAs.
Nuclear Localization Signal
Amino acid sequence that targets proteins for transportation from the Cytoplasm to the Nucleus.
OUTER Nuclear Membrane
The _____ _______ Membrane CONTINUOUS w/ the Endoplasmic Reticulum.
INNER Nuclear Membrane
The ____ _______ Membrane is ADJACENT to the Nuclear Lamina.
Importin
Karyopherin that RECOGNIZES Nuclear Localization Signals & DIRECTS Nuclear Import.
Nuclear Membrane
1 of Membranes forming Nuclear Envelope; (the Outer …. is Continuous w/ ER &; the Inner ….. is Adjacent to the Nuclear Lamina.
