Filters
Question type
Study Flashcards

How does the structure of the outer side of the nuclear pore complex differ from that of the inner side?

Correct Answer

verifed

verified

On the outer side, eight cytoplasmic fil...

View Answer

The eukaryotic large ribosomal subunit contains the 28S, 5.8S, and 5S rRNAs, plus many different proteins.

A) True
B) False

Correct Answer

verifed

verified

The activity of transcription factors is frequently regulated by controlling their localization within eukaryotic cells, such that only in response to a given stimulus is the transcription factor transported into the nucleus, where it can activate its target genes. For a transcription factor that has a nuclear localization signal (NLS), describe two mechanisms by which regulated transport can occur.

Correct Answer

verifed

verified

Two possible mechanisms involve masking ...

View Answer

Nuclear localization signals are usually short sequences rich in which amino acids?

Correct Answer

verifed

verified

In ribosome assembly, _______ that were synthesized in the cytoplasm are assembled into complexes on pre-ribosomal RNA molecules.

Correct Answer

verifed

verified

proteins (...

View Answer

Individual chromosomes occupy distinct _______ within the nucleus.

Correct Answer

verifed

verified

territorie...

View Answer

The genes encoding 5.8S, 18S, and 28S ribosome RNA are clustered together in


A) tandem arrays located on one chromosome.
B) tandem arrays interspersed with tandem arrays of genes encoding 5S ribosomal RNA.
C) tandem arrays located on three chromosomes.
D) tandem arrays located on five chromosomes.

E) None of the above
F) B) and D)

Correct Answer

verifed

verified

By what mechanism are most nuclear proteins specifically targeted to the nucleus for import?

Correct Answer

verifed

verified

They have a nuclear import signal (a sho...

View Answer

The nuclear envelope consists of what four major components?

Correct Answer

verifed

verified

The inner nuclear membrane, th...

View Answer

Emery-Dreifuss muscular dystrophy and Hutchinson-Gilford progeria are caused by mutations in genes that code for


A) importin or Ran.
B) Polycomb proteins.
C) NF-κB.
D) A-type nuclear lamins or emerin.

E) A) and D)
F) A) and C)

Correct Answer

verifed

verified

Small molecules (< 20 kd) enter nuclei by way of


A) passive diffusion through nuclear pore complexes.
B) selective transport through nuclear pore complexes.
C) active transport across the nuclear envelope membranes.
D) passive diffusion across the nuclear envelope membranes.

E) All of the above
F) A) and B)

Correct Answer

verifed

verified

The nuclear localization signal is typically a(n) _______, rich in the amino acids _______.


A) α helix; Pro, Lys, and Arg
B) α helix; Leu, Phe, and Gly
C) short sequence; Lys and Arg
D) short sequence; Pro, Leu, and Gly

E) A) and D)
F) C) and D)

Correct Answer

verifed

verified

The mass of the nuclear pore complex is estimated to be


A) smaller than that of a ribosome.
B) about the same as that of a ribosome.
C) about five times that of a ribosome.
D) about 30 times that of a ribosome.

E) B) and C)
F) A) and C)

Correct Answer

verifed

verified

Receptor-dependent protein transport into the nucleus requires the recognition of a _______ on the cargo protein.

Correct Answer

verifed

verified

nuclear lo...

View Answer

Entry into the nucleus is limited by the _______ and the _______ complexes.

Correct Answer

verifed

verified

nuclear envelope (nu...

View Answer

Because of the presence of a nuclear envelope, eukaryotes can perform several functions that prokaryotes cannot. Identify one of these functions.

Correct Answer

verifed

verified

Answers will vary, including p...

View Answer

What modification of nucleotides occurs during processing of pre-rRNA?

Correct Answer

verifed

verified

Addition o...

View Answer

In eukaryotic cells, the contents of the nucleus are separated from the cytoplasm by the _______.

Correct Answer

verifed

verified

nuclear en...

View Answer

Polycomb proteins consist of _______ complex(es) and are concentrated in Polycomb bodies within the nucleus.


A) 1
B) 2
C) 3
D) either 2 or 3, depending on cell type

E) A) and D)
F) B) and C)

Correct Answer

verifed

verified

Cajal bodies are thought to represent sites of


A) DNA replication.
B) snRNA processing and assembly.
C) large ribosomal subunit assembly.
D) small ribosomal subunit assembly.

E) None of the above
F) All of the above

Correct Answer

verifed

verified

Showing 101 - 120 of 128

Related Exams

Exam 1

An Overview of Cells and Cell Research

124 Questions

Exam 2

Molecules and Membranes

133 Questions

Exam 3

Bioenergetics and Metabolism

138 Questions

Exam 4

Fundamentals of Molecular Biology

117 Questions

Exam 5

Genomics, Proteomics, and Systems Biology

108 Questions

Exam 6

Genes and Genomes

101 Questions

Exam 7

Replication, Maintenance, and Rearrangements of Genomic Dna

103 Questions

Exam 8

RNA Synthesis and Processing

104 Questions

Exam 9

Transcriptional Regulation and Epigenetics

115 Questions

Exam 10

Protein Synthesis, Processing, and Regulation

98 Questions

Exam 12

Protein Sorting and Transport

110 Questions

Exam 13

Mitochondria, Chloroplasts, and Peroxisomes

106 Questions

Exam 14

The Cytoskeleton and Cell Movement

106 Questions

Exam 15

The Plasma Membrane

109 Questions

Exam 16

Cell Walls, the Extracellular Matrix, and Cell Interactions

101 Questions

Exam 17

Cell Signaling

114 Questions

Exam 18

The Cell Cycle

101 Questions

Exam 19

Cell Death and Cell Renewal

107 Questions

Exam 20

Cancer

102 Questions

Show Answer