Pages in this set

Page 1

Preview of page 1
Differences in DNA
Prokaryotic cells Eukaryotic cells
No true nucleus True nucleus
No chromosomes DNA combines with proteins to form
Circular DNA chromosomes located inside the
No associated proteins nucleus

Chromosome structure
Chromosomes are only visible as distinct structures when a cell is dividing.
Chromosomes appear as…

Page 2

Preview of page 2
The chromosome number for a given species is always constant. In the nucleus of
the somatic (body) cells in eukaryotes the chromosomes occur in homologous
pairs ­ the cells are DIPLOID (2n/ in pairs)
Gametes are HAPLOID ­they contain HALF the normal number of chromosomes
(e.g. sperm and egg)


Page 3

Preview of page 3
Mitosis is the division of the nucleus of a cell that results in each of the daughter
cells having an exact copy of the DNA of the parent cell except the rare event of

Mitosis is involed in:
· GROWTH ­ an increase in size through the division of…

Page 4

Preview of page 4
The cell cycle
Three stages of cell cycle:

INTERPHASE- which occupies most of the cell cycle. It is divided into
three parts
NUCLEAR DIVISION- when the nucleus divides into two (mitosis) or four
CELL DIVISION- process by which the whole cell divides into two or four


Page 5

Preview of page 5
Cancer is a group of diseases caused by growth disorder of cells. It
is caused by damage to the genes which regulates mitosis and the
cell cycle.
Cancer treatment
Cancer is treated by blocking the cell cycle to prevent the uncontrolled cell

Chemotherapy involves drugs which disrupts cell cycle:…

Page 6

Preview of page 6


No comments have yet been made

Similar Biology resources:

See all Biology resources »