cell division and mitosis

Question 1

why do we need cell division by mitosis

Answer 1

when an organism grows or repairs it self

Question 2

mitosis

Answer 2

nuclear division

Question 3

interphase

Answer 3

. energy stores increase
.cell grows in size
.organelles replicated
. dna copied

Question 4

mitotic phase

Answer 4

mitosis-first the nucleus divides into two daughter nuclei

cell divides- cytokinesis

Question 5

chromatin

Answer 5

have a loose open structure so it can be accessible for translation and transcription

Question 6

chromosome

Answer 6

single long molecules of dna

Question 7

chromosome replication in interphase

Answer 7

sister chromatids joined by centromere

Question 8

prophase

Answer 8

1- chromosomes condense and become visible in the nucleus
2- nucleus disappears and the nuclear membrane starts to break down
3- centrioles moves to either pole of the cell
4- proteins begin to form spindle fibers which attach to the centromere of each chromosome
5- the spindle fibers move the chromosomes to the center of the cell

Question 9

metaphase

Answer 9

1- the spindle apparatus is completely formed and the chromones are lined up in the center of the cell

Question 10

anaphase

Answer 10

1- centromeres divide into two
2- spindle fibers begin to shorten
3- this pulls the sister chromatids to the opposite poles of the cell like this

Question 11

telophase

Answer 11

1- chromatids have reached to the poles of the cell
2- the spindle apparatus breaks down
3- nuclear membranes reform
4-chromosomes go back to chromatin state
5-nucleolus reappears

Question 12

cytokinesis

Answer 12

the central cell membrane is pulled in wards by cytoskeleton forming a furrow and the membranes fuse to create independent cells