Warm-Up- EOC Prep
1) What would happen to a red blood cell if salt
water was added?
A It would increase in size.
B It would decrease in size.
C Nothing would happen.
D It would turn cloudy.
2) A cell is unable to control the amount of water
that enters and leaves the cell. Which of the
following structures is most likely defective?
A Cell wall
B Mitochondria
C Cell membrane
D Golgi Apparatus
Agenda
Warm-up
 Cell Cycle Notes
 WS- Cell Cycle- Holt Book
 Diagram of Cell Cycle
 Progress reports / returning papers in
portfolios
 Clean-up
 Cool-down

Cell Cycle
 The
larger a cell becomes, the
more demands the cell places
on its DNA. In addition, the
cell has more trouble moving
enough nutrients and wastes
across the cell membrane.
 As
the size of cell increases,
the volume increases much
more rapidly than the surface
area, causing the ratio of
surface area to volume to
decrease, which creates
serious problems for the cell.
 If
a cell got too large, it would
be more difficult to get
enough oxygen and other
nutrients in and waste
product out, which is why cells
do not grow much larger if
the organism of which they
are a part does.
 Before
it becomes too large, a
growing cell divides forming
two “daughter” cells. The
process by which a cell divides
into to new daughter cells is
called cell division.
 Before
cell division occurs, the
cell replicates, or copies, all of
its DNA. This replication
allows each daughter cell to
get on complete set of genetic
information.
 The
Cell Cycle is a repeating
series of cellular growth and
division during the life of an
organism.
A
cell will spend 90% of its
time in the first three phases
of the cycle, which all together
are called interphase. The last
two stages of the cell cycle
are for division.
Five stages of the cell cycle:
1. First Growth (G1) phase-Cell
grows fast
2. Synthesis (S) phase-DNA is copied
3. Second Growth (G2) phase-growth
and preparation for mitosis
4. Mitosis-process during cell division
that divides
the nucleus of a cell into two nuclei
5. Cytokinesis-division of cytoplasm
 During
the cell cycle, a cell
grows, prepares for division,
and divides to form two
daughter cells, each of which
then begins the cycle again.
 REVIEW
 In
what phase of the cell cycle
does the DNA replicate?
 S-synthesis
phase
A
repeating series of growth
and division is called the …
 Cell
cycle
 As
the size of the cell
increases, the
__________________ to
________________ ratio to
decrease.
 Surface
area to volume
 The
cell spends 90% of its
time in what phase…
 interphase
 Which
3 phases make up
interphase?
 G1, S, G2
Cell Cycle Diagram

Use the white paper in the box and crayons
/colored pencils to create the cell cycle
diagram.
Include short descriptions of all 5 stages.
Make sure your name is on it.
This is independent work.

Page 245 in the textbook.



Cool-Down
What ratio is important when
controlling the size of the cell?
2. What are the 3 stages of
interphase?
3. In what stage is DNA
replicated?
1.