nucleus

Question 1

what are the two ways DNA is stored

Answer 1

euchromatin: lose packed DNA which is easily acessible by transcription machinary
hetrochromatin: tight packed DNA, not used
dynamic equilibrium as genes are in use and not in use

Question 2

how is DNA packaged

Answer 2

2nm fibers bind with histone 2-4 to form nucleosomes making a 10nm fiber. then with histone 1 to form a 30nm fiber, which futher fold toa 300nm fiber.
when cell division this forms a metaphase cromosome

Question 3

discribe the nucleopore complex

Answer 3

nucleoporins form a nucleopore complex which is a chanel which streaches the inner membrane through the perinuclear space through the outermembrane space

Question 4

what is able to travel through the nuclear pore complex, into nucleaus and out of nucleaus

Answer 4

into: Energy, building blocks of ribosomes, signals
out of: ribosomal subunit, tRNA, mRNA

Question 5

What is the function of the nucleolus

Answer 5

the nucleolus makes ribosomal sub units such as ribosomal protins and RNA.
ribosomes are made outside in the cytosol
they can have multiple in a cell
doesnt have any when cell is dividing

Question 6

how is the nuclear envelope comprised

Answer 6

outer membrane-> perinuclear space -> inner membrane -> lamina (intermediate filaments which maintain shape)

Question 7

what is the job of the nucleus

Answer 7

to store most of the cells DNA
to be the comand center to the cell
5-10um in diameter

Question 8

what does the nucleolus make

how it it bound

Answer 8

ribosomeal RNA and ribsomal sub units

non-membrane bound regoin