Tuesday Jan 27th-Week 4
Science of Life
TOPIC: Cellular Growth
 OBJ : 1-4
DO NOW: Why does cytokinesis represent the smallest amount of
time a cell spends in the cell cycle?
-Science Enrollment
-work on 9.1 Vocab
-Review 9.1 App notes
HANDOUTS to PICK-UP:
-none
ABSENT
AGENDA
EXT:
DUE DATE:
DW: 9.1 Vocab
---------------------------------------------------------------------------------------------------------------SEMINAR 2:
-NA
BEFORE/AFTER SCHOOL:
DW- 9.1 App. Notes (Front Page Only)
EXIT: Fill in your level of understanding AND Summarize the relationship
between surface area and volume as a cell grows.
TUESDAY
Tuesday: ___1__/__27___
OBJECTIVE…#_1-4____
TOPIC:
Cellular Growth
Daily Work Grade- 9.1 App Notes (Front Page)
DW GRADE:
2 1 0
DO NOW
•Q: Why does cytokinesis represent
the smallest amount of time a cell
spends in the cell cycle?
•A: The cell spends most of its life
in interphase [growing]
Today’s Objectives
1--- EXPLAIN why cells are relatively small
2--- SUMMARIZE the primary stages of the cell cycle
3---IDENTIFY four events that occur in a cell during interphase
4---DESCRIBE the structure of a chromosome
Vocabulary
-cell cycle
-interphase
-mitosis
-cytokinesis
-chromosome
-chromatin
These should be
done by test day!
COOPERATIVE GROUP: APPLICATION NOTES
APPLY your KNOWLEDGE from the
reading to complete the notes as a
cooperative group.
MAIN IDEA
-CELLS GROW until they reach their LIMIT
-STOP GROWING
-DIVIDE
REVIEW VOCAB
DEFINE selective permeability
-process: membrane allows some substances to pass /
keeps others out
DEFINE diffusion
-movement of materials from HIGH concentration to
LOW concentration
CELL SIZE LIMITATIONS
IDENTIFY the key factor that limits cell size:
-RATIO of SA:VOL
LIST:
2 essential materials that must ENTER and EXIT the cell membrane
waste
nutrients
-_______________
-_______________
CALCULATE the ratio of SA:VOL in the hypothetical cell shown.
6
2
2
24 cm2
SA: _____x_____x_____=
3
2
2
8
cm
2
V: _____x_____x_____=
1
3
RATIO-_____:_____
CELL
SIZE LIMITATIONS
LIMITATIONS
CELL
SIZE
SUMMARIZE the relationship between surface area-to-volume.
-As a cell's volume increases, what happens to the proportional
amount of surface area?
increases decreases stays the same
-Of the surface area-to-volume ratio, what does the surface area
represent in a cell?
nucleus
cytoplasm plasma membrane
CELL
SIZE LIMITATIONS
LIMITATIONS
CELL
SIZE
EXPLAIN: why a high ratio of surface area to volume
benefits a cell-rapid diffusion of nutrients
-efficient transportation of waste removal
LIST:
two alternative futures for cells when they reach their
size limitations.
STOP GROWING
1-____________________
DIVIDE
2-____________________
THECELL
CELL CYCLE
THE
CYCLE
COMPLETE: the concept map of the cell cycle.
INTERPHASE
MITOSIS
G1
PROPHASE
S
METAPHASE
G2
ANAPHASE
TELOPHASE
CYTOKINESIS
THECELL
CELL CYCLE
THE
CYCLE
DESCRIBE the main events in each stage [1-2 bullets].
G1
-cell growing
-normal function
S
-cell replicates DNA
G2
-cell preps for division
MITOSIS
-chromosome to opposite ends [poles]
-nucleus divides
CYTOKINESIS
-cytoplasm divides
-2 daughter cells formed
THECELL
CELL CYCLE
THE
CYCLE
IDENTIFY:
Four events that occur in a cell during interphase
CELL GROWS
1-__________________________
CELL CARRIES OUT METABOLISM
2-__________________________
CELL DUPLICATES CHROMOSOMES
3-__________________________
CELL PREPARES FOR DIVISION
4-__________________________
CELL
STRUCTURE REVIEW
CELL
STRUCTURE
REVIEW
SKETCH STRUCTURE of CHROMOSOME /
CHROMATIN
IDENTIFY where in the cell chromosome are
located-NUCLEUS
EXPLAIN the relationship of DNA, a chromosome,
and chromatin
-chromosomes are composed of DNA.
-chromatin is a relaxed form of a chromosome.
CELL
STRUCTURE REVIEW
CELL
STRUCTURE
REVIEW
ORGANIZE: Information about the chromosomes
-carry genetic info
-copied
-passed on
-most of
life exist
as
chromatin
Contain DNA
-before division
appear as short
stringy structures
in nucleus
-w/o proper DNA cell
doesn’t survive
*accurately passed on
CRITICAL THINKING
CRITICAL
THINKING
CRITICIZE this statement:
Interphase is a “resting period” for the cell before it begins
mitosis.
-During Interphase, the cell is NOT “resting”.
-It is:-producing proteins
-carrying out normal cell functions
9.1 VOCAB
FOLD
-along dotted line
CUT
-across solid line HALF way
---------FRONT -VOCAB TERM
---------INSIDE left -definition
-own words
-10 words or less
INSIDE right -PICTURE EXAMPLE
-picture only / NO WORDS
EXIT
FILL-IN: level of understanding of today’s objective

EXIT: Summarize the relationship
between surface area and volume
as a cell grows.