3.1 Nucleus Morphology

Question 1

What is the first clue to identify the cell type?

Answer 1

The nucleus

Question 2

All nuclei, regardless of shape, have:

Answer 2

• Nuclear envelope
• DNA on the inside of nucleus

Question 3

Name the parts for the nuclear structure

Answer 3

• Nuclear lamina
• Nuclear pore
• Inner and outer membrane of nuclear envelope
• Ribosomes
• Chromatin (Heterochromatin & euchromatin)
• Nucleolus

Question 4

The nuclear lamina contains what type of filaments?

Answer 4

Intermediate filaments

Question 5

Where are the ribosomes located in the nucleus?

Answer 5

On the outer membrane of the nuclear envelope

Question 6

The nucleus is the information ___ of the cell and contains most of the ___ in eukaryotic cells

Answer 6

Storer
DNA

Question 7

Through the process of ___, selective genes are used to direct cellular activity

Answer 7

Cell differentiation

Question 8

The nuclear envelope contains

Answer 8

2 parallel unit membranes (2 parallel trilaminar membranes)

Question 9

What is the space between 2 membranes?

Answer 9

Perinuclear cisternae

Question 10

Define nuclear lamina

Answer 10

Lines inner nuclear membrane

• contains intermediate filaments
• gives the nucleus its shape

Question 11

What is closely associated with the nucleus to capture chromosomes?

Answer 11

Centrosome and microtubules

Question 12

Define perinuclear space (cisternae)

Answer 12

Space between the inner and outer portion of nuclear membrane

Question 13

What are the nuclear contents?

Answer 13

• Chromatin (Interphase cell - hetero and euchromatin) (dividing cells - chromosomes)
• Nucleolus (Ribosome formation)
• Nuclear matrix

Question 14

Ribosome factory is located in the

Answer 14

Nucleolus

Question 15

Describe the nuclear pore complex

Answer 15

• 2 way gate
• requires energy and special chaperone proteins
• requires nuclear localization signal
• Exports mRNA

Question 16

What is the signal sequence called for importing proteins and what’s the sequence?

Answer 16

Nuclear localization signal (NSL)

Pro-Pro-Lys-Lys-Lys-Arg-Lys-Val

Question 17

Function of nuclear transport receptor

Answer 17

Binds to the RNA strand and helps it go through the nuclear core complex

Question 18

Do all mRNA have to go to the ER?

Answer 18

No

Question 19

Is there heterochromatin where the nuclear pore is?

Answer 19

No, there’s breaks in it for the pore