Transcript Cell Size Limitations Notes1

Cell Sizes &
Growth
Limitations
EQ: What factors controls or limit
the Cell Size?
1. Diffusion limits size
2. DNA content limits size
3. Surface area to volume
ratio limits size
EQ: What controls…Cell Size
and Limitations
1) D______________ limits size
2) DNA content limits ________
3) Surface a___________ to
v___________ ratio limits size
How does Diffusion limit cell
size?
An oxygen molecule follows a path to
the mitochondria
(Oxygen)…
plasma membrane  cytoplasm 
mitochondria
Smaller size allows the cell
to be more efficient
•
EQ: How does Diffusion limits
size?(1)
• An oxygen molecule follows a path to
the mitochondria.
• Oxygen (O2) ….moves from outside the cell
through the…
pl_______ m_________ to the ()
c_________________m 
m__________________ia
•
S____________ size allows the cell to
be more e_____________.
EQ: How does DNA content limits
size?
• Cells usually contain only one nucleus
•DNA
•DNA
•RNA
•RNA
•DNA
is found in the nucleus
makes RNA
will travel through the cytoplasm to the ribosomes
assists the ribosomes in making proteins
is responsible for the whole above process
• If the cell was very large, there would not be enough
DNA to support the cell.
EQ: How does DNA content limits
size? (2)
*if the cell was a very
__________size, there would not
be enough _________ to support
the cell.
EQ: How does DNA content limits
size?
• Cells usually contain only ______ nucleus
-_______ is found in the nucleus
- DNA makes _______________
-RNA will travel through the
c___________ to the r_____________
• RNA assists the ri____________s in
making p_____________.
• _________ is responsible for the whole
above process
EQ: How does Surface area to
volume ratio limits cell size
• As a cell increases, it volume increases much faster
than its surface area
• If a cell doubled, the cell would require 8X more
nutrients and have 8X more waste to get rid of
FYI – If E.coli were left unreglated, it could
engulf the Earth in one day because it doubles in
volume every 30 minutes!!
EQ: How does surface area to
volume ratio limits size?
• As a cell i__________in size, the volume
increases much faster than its
S_______________ area
EQ: When do cells divide?
• All organisms grow and change.
• Cells are constantly growing, dividing, and dying
• Some cells divide more than others –
•Heart & nerve system cells rarely (if ever)
divide
•Skin cells, on the other hand, are constantly
dividing
•Growth is related to cell specificity and activity
•If cell growth is uncontrolled – leads to cancer
EQ: When do cells divide?
All organisms g______ and
c________
• Cells are constantly growing,
d________, and d__________
•
• Some cells divide more than others –
• G_________ is related to cell specificity
and activity
• If cell growth is uncontrolled – leads to
c____________