Unformatted text preview: ot; -- layer!
intermediate filaments made of lamin; and
forms network just under nuc. envelope.
(3) nuclear pore complexes (NPC) which is not well-understood, but having
how material gets OUT of nuc. into
several types of proteins called nucleoporins. Regulatesproteins and stuff get INTO nucleus! cytoplasm
and how Meshwork Fig. 3-4 Nuclear “pores” (aka annuli) provide openings through the nuclear
envelope for controlled two-way transit of RNA and protein.
nuc pores involved in 2 way trafﬁc! stuff coming in/out seem to pass thru
same pores! -- most material LEAVING nuc is transcribed mRNA. Most
stuff coming iN are proteins which have to be made in cytoplasm. (freeze-fracture technique) Cell is frozen and CRACKED, then
with something heavy like GOLD. 2 Fig. 3-5 Fig. 3-6 The Cell Cycle
G2 is very short
phase -- just a few
hours -- cells get
what they need in
order to go through
MITOSIS. "quiet" DNA condenses
during PROPHASE. Longest period!!!! Over half the cell cycle's total time. Cell cycle phases:
G1 – phase when cells may differentiate, but remain capable of replicating DNA
and dividing again preliminary to S-PHASE (S=synthesis...
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