Cells 2 Flashcards
how do we find heterochromatin?
tightly coiled DNA in storage
how do we find euchromatin?
it is diffuse and unraveled and in use or genetically active
identify the nucleolus, euchromatin, heterochromatin.
white is euchromatin
black small spots is heterochromatin
the nucleolus is the big black spot in the right
Do highly differentiated cells have euchromatin or heterochromatin? Many organelles, few organelles? small or prominent nucleoli?
euchromatin, many organelles, prominent nucleoli
Do highly undifferentiated cells have euchromatin or heterochromatin? Many organelles, few organelles? small or prominent nucleoli?
heterochromatin, few organelles, small nucleoli
how fast do undifferentiated cells divide?
very fast
how fast do differentiated cells divide?
rarely
how many membranes does the nuclear envelope have?
2; its a bi-layer
which layer of the nuclear membrane is continuous with the rough ER?
the outer
what does the nuclear membrane do?
it regulates mitotic activity
what is the nuclear membrane composed of?
intermediate filamentes and membrane proteins
how many histones does a nucleosome have?
9
what is the linker histone?
H1
what are the histones?
H2A,H2B, H3,H4
what does the nucleolus do?
synthesis of rRNA
