Cell Nucleus

Question 1

Functions of the nucleus

Answer 1

1. Store genes on chromosomes
2. Organize chromosomes for cell division and the uncoiling of DNA for replication
3. Transport regulatory factors via nucleopores
4. Produces mRNA and ribosomes

Question 2

Transcriptionally active

Answer 2

Heterochromatin

Question 3

Abundant in active, transcribing cells

Answer 3

Euchromatin

Question 4

Chromosome painting

Answer 4

FISH or Flourescent In Situ Hybridization

Question 5

Has two membranes, the outermost is continuous with RER and has ribosomes attached

Answer 5

Nuclear envelope

Question 6

The space between outer and inner membranes

Answer 6

Rough Endoplasmic reticulum space

Question 7

May serve as a stabilizing filaments, layer of thin filaments which surrounds the nucleus except at the nuclear pores

Answer 7

Nuclear lamina

Question 8

Formed at sites where the inner and outer membranes of the nuclear envelope are joined

Answer 8

Nuclear pores

Question 9

Organized from NOR

Answer 9

Nucleolus

Question 10

Electron dense filaments, formed from newly transcribed rRNA

Answer 10

Pars fibrosis

Question 11

Seen as circular areas surrounded by rim of electrons dense filaments

Answer 11

Nuclear organizing regions

Question 12

This is where no one can see the accumulation of ribonucleoprotein particles

Answer 12

Pars granulosa