9.1-9.10

Question 1

advantage of nucleus for eukaryotes

Answer 1

• protects loosely-compacted DNA from breakage by cytoskeleton
• allows for more sophisticated regulation of gene expression

Question 2

steps of processing mRNA

Answer 2

1. 5’ cap
2. intron splicing
3. poly-A tail

Question 3

the size of nuclei mirrors what?

Answer 3

amount of DNA inside

Question 4

most cells have _____ nucleus that is spherical/oblong

Answer 4

one

Question 5

exceptions to cells with one nucleus

Answer 5

1. mature, differentiated cells with no nucleus
2. multi-nucleated cells due to karyokinetic events without cytokinesis
3. multi-lobed nucleus in cells like neutrophils, eosinophils, basophils

Question 6

as a cell matures, how does this change heterochromatin and euchromatin levels?

Answer 6

• heterochromatin increases
• euchromatin decreases

Question 7

what are chromosome territories/domains maintained by

Answer 7

telomere anchors to the nuclear envelope

Question 8

interchromosomal domains

Answer 8

adjacent chromatin-free regions next to domains

Question 9

where are interchromosomal domains located

Answer 9

next to NPCs