Transcript 9.1 CELLULAR GROWTH - Olathe School District

9.1 CELLULAR GROWTH
WHAT YOU WILL LEARN
-Why cells are small
-The stages of the cell cycle
-The stages of interphase
READING Q’s
EXPLAIN
-Show the equations used to calculate surface area & volume
for a cell that is 2 micrometers in diameter.
SURFACE AREA: L X W X 6 sides
2 x 2 x 6sides = 24 um2
VOLUME: L X W X H
2 x 2 x 2 = 8 um3
READING Q’s
EXPLAIN
-What happens to ratio of surface area to volume as cell
grows?
-IT GETS SMALLER
READING Q’s
STATE
-Complete the table by writing the number of cells present at
the end of each stage.
ONE
CELL
TWO
CELLS
READING Q’s
LABEL
-Circle the stage of interphase during which DNA is copied.
READING Q’s
NAME
-What is cell division in
prokaryotes called?
-BINARY FISSION
-asexual reproduction
- cell divides into 2
genetically identical cells
GROUP WORK: APPLICATION NOTES
-As a group complete the application notes using your
knowledge from the reading
CELL SIZE LIMITATIONS
ANALYZE:
movement of nutrients and wastes as cell size increases.
gets too large
If a cell_____________________________
nutrients
wastes
transport of _______________
& _______________
diffusion
by_______________
slows down—
making cells less efficient.
divide
Therefore, cells _______________
before they become
large
too_______________.
CELL SIZE LIMITATIONS
DESCRIBE:
How surface area-to-volume ratio relates to cell size
-As a cell grows larger, its volume
__________ increases more
area thus surface area-to-volume
rapidly than its surface
__________,
ratio __________.
decreases
LIST:
Two alternative futures for cells when they reach their size limitations.
1-_______________
stop growing
2-_______________
divide
THE CELL CYCLE
COMPLETE/DESCRIBE:
cell cycle / main events in each stage
-cytoplasm divides
-2 daughter cells formed
CYTOKINESIS
-nucleus divides
MITOSIS
-cell prepares for
mitosis division
G2
G1
S
-cell grows
-normal function
-cell copies DNA
THE CELL CYCLE
IDENTIFY:
Four events that occur in a cell during interphase
CELL GROWS
1-__________________________
CELL CARRIES OUT FUNCTIONS
2-__________________________
CELL DUPLICATES CHROMOSOMES
3-__________________________
CELL PREPARES FOR DIVISION
4-__________________________
THE CELL CYCLE
SKETCH / LABEL:
the structure of a chromosome
Sister chromatid
centromere
CHROMOSOME
-contain genetic info
-passed generation to generation
-found in cell’s nucleus
-CHROMATIN-relaxed form of DNA during interphase
THE CELL CYCLE
ORGANIZE: Information about the chromosomes
-holds genetic info:
-copied / passed on
contain DNA
-most of
life exist
as
chromatin
- cell doesn’t
survive w/o
accurately copied
DNA
-before division
appear as short
stringy structures
in nucleus-chromatin
SUMMARIZE
ANALYZE:
How more sophisticated microscopes have allowed scientists
to advance their knowledge of cells.
-cells must stay small to function properly
-cells use cell cycle to stay small
-cells actively growing in interphase
-when a growing cell reaches its max size, it keeps small by
dividing into two smaller daughter cells
MATCH
B
C
A
F
E
D