CH 9: The Nucleus - (Key Terms)

Question 1

Euchromatin

Answer 1

Decondensed, Transcriptionally ACTIVE Interphase

Question 2

Exportin

Answer 2

A karyopherin that RECOGNIZES Nuclear Export Signals & DIRECTS Transport FROM the Nucleus to the Cytosol

Question 3

Heterochromatin

Answer 3

Condensed, Transcriptionally INACTIVE Chromatin.

Question 4

Karyopherin

Answer 4

a Nuclear Transport Receptor.

Question 5

Lamin

Answer 5

an Intermediate Filament Protein that FORMS the Nuclear Lamina.

Question 6

Nuclear Body

Answer 6

a Discrete Organelle w/in the Nucleus.

Question 7

Nuclear Envelope

Answer 7

Barrier SEPARATING Nucleus from Cytoplasm, COMPOSED OF an (1) Inner + (2) Outer Membrane, a (3) Nuclear Lamina, & (4) Nuclear Pore Complexes.

Question 8

Nuclear EXPORT Signal

Answer 8

Amino Acid sequence that TARGETS Proteins for Transport from the Nucleus to the Cytosol.

Question 9

Nuclear Lamina

Answer 9

Meshwork of Lamin Filaments providing Structural Support to Nucleus.

Question 10

Ran

Answer 10

Small GTP-Binding Protein involved in Nuclear Import + Export.

Question 11

Replication Factory

Answer 11

Large Complex containing Clustered sites of DNA Replication in Eukaryotic Cells.

Question 12

Small Nucleolar RNA (snoRNA)

Answer 12

Small RNA present in Nucleolus that functions in PRE-rRNA Processing.

Question 13

Nucleolus

Answer 13

Nuclear site of rRNA Transcription, Processing, & Ribosome Assembly.

Question 14

Nuclear Pore Complex

Answer 14

Large structure forming a Transport Channel THRU Nuclear Envelope.

Question 15

Nuclear Transport Receptor

Answer 15

A protein that recognizes nuclear localization signals and mediates transport across the nuclear envelope.

Question 16

Nucleolar Organizing Region

Answer 16

Chromosomal Region containing the Genes for Ribosomal RNAs.

Question 17

Nuclear Localization Signal

Answer 17

Amino acid sequence that targets proteins for transportation from the Cytoplasm to the Nucleus.

Question 18

OUTER Nuclear Membrane

Answer 18

The _____ _______ Membrane CONTINUOUS w/ the Endoplasmic Reticulum.

Question 19

INNER Nuclear Membrane

Answer 19

The ____ _______ Membrane is ADJACENT to the Nuclear Lamina.

Question 20

Importin

Answer 20

Karyopherin that RECOGNIZES Nuclear Localization Signals & DIRECTS Nuclear Import.

Question 21

Nuclear Membrane

Answer 21

1 of Membranes forming Nuclear Envelope; (the Outer …. is Continuous w/ ER &; the Inner ….. is Adjacent to the Nuclear Lamina.