Nucleus and Chromosomes Flashcards
1
Q
nucleus is the ____________ of the euk. cell
A
information center
2
Q
what is the most prominent structure in the euk. cell?
A
nucleus
3
Q
what does the nucleus contain?
A
DNA!
4
Q
nucleus is surrounded by?
A
nuclear envelope
5
Q
what is the nuclear envelope composed of?
composed of numerous…?
each pore is a..?
examples of things transported across the pores?
A
- inner and outer membranes
- has numerous openings (pores)
- each pore is a channel through which water soluble molecules can move between the nucleus and the cytoplasm
- ribosomal subunits, mRNA, chromosomal proteins, enzymes
6
Q
when are chromosome most easily visualized?
A
during mitosos, when they are heavily condensed
7
Q
what is also present in the nucleus?
A
nucleoli
8
Q
what are nucleoli?
A
structures responsible for synthesizing and assembling most of the RNA and protein components needed to form ribosomes
9
Q
DNA Packaging:
what happens when DNA is bound to proteins?
A
it is converted into chromatin that are normally dispersed throughout the nucleus
