1. Chapter 3 Objectives List the three parts of the cell theory.
Section 2 Cell Features
Objectives
List the three parts of the cell theory.
Determine why cells must be relatively small.
Compare the structure of prokaryotic cells with that of eukaryotic cells.
Describe the structure of cell membranes.

2. New Vocabulary Cell theory Cell membrane Cytoplasm Cytoskeleton
Ribosome
Prokaryote
Cell wall
Flagellum
Eukaryote
Nucleus
Organelle
Cilium
Phospholipid
Lipid bilayer

3. After Robert Hooke named the “cell” in 1665, it took many scientists who were working together ______ years to understand what a cell was
Matthias _____________, a German botanist, viewed many plants under a microscope
In 1838, he concluded that all plant parts are made of _______________
150
Schleiden
cells

4. 1839 Schwann animal Virchow preexisting
One year later, in ________, Theodore _________ concluded that all __________ parts are made of cells
Hint…Schwann sounds like swan
In 1858, Robert __________ determined that all cells come from _________________ cells that reproduced
animal
Virchow
preexisting

5. cell theory made structure function preexisting Chapter 3
Section 2 Cell Features
The work of these three scientists are the basis for the ___________________, which has three parts:
1. All living things are _________ of one or more cells.
2. Cells are the basic units of _____________ and _________________ in organisms.
3. All cells arise from ________________ cells.
cell theory
made
structure
function
preexisting

6. efficiently volume surface area membrane parts Chapter 3 Cell Size
Section 2 Cell Features
Cell Size
Cells cannot grow too large because small cells function more ________________ than large cells
This is due to the fact that ________________ increases more quickly than _________________
efficiently
volume
surface area
The surface area of this cube represents the cell ____________. Its volume contains all of its cell __________
membrane
parts

7. If each side of the cube is 1mm long, what is its surface area?
Find the area of one side and multiply by ____ to find the total area of all the sides
Area = 1 mm x 1mm = _________
Surface area = ________ x _____ =
1 mm 6
1 mm2
1 mm2 6
6mm2

8. 1mm 1mm 1mm 1mm3 6:1 Find the volume of this cube 1 mm
Volume = length x width x height
Volume = ____ x ____ x ____ = ______
So this cell’s surface area to volume ratio is…
1 mm
1mm
1mm
1mm
1mm3
6:1

9. Find surface area and volume for a cube with sides that are 2mm long
S.A. =
Volume =
So the s.a. to volume ratio of this cube is…
2 mm
24 mm2
8 mm3
24: = :1

10. Find surface area and volume for a cube with sides that are 4 mm long
S.A. =
Volume =
So the s.a. to volume ratio of this cube is…
4 mm
96 mm2
64 mm3
96: = :2

11. 6 3 1.5 Ratios can also be written as fractions 1 mm 6:1 6/1 =

12. low
If a cell’s surface area–to-volume ratio is too _____, substances cannot enter and leave the cell well enough to meet the cell’s needs.
So if the cell grows too big, it won’t be able to get enough food _____ or waste ______ fast enough to survive in
out

13. big park Think of yourself in a crowded park
One park is small and one park is big, but they are both uniformly crowded or have the same density
Will it take you longer
to travel to the center of
the small park or the big
park?
big park

14. The same applies for food particles in a cell, so large cells end up ______________ from lack of food or being ____________________ by waste
starving
poisoned

15. Question 1
Who studied plants…Schleiden or Schwann?
Schleiden

16. Question 2 What are the three parts of the cell theory?
All living things are made of one or more cells.
Cells are the basic unit of structure and function in
organisms.
Cells come from preexisting cell.

17. Question 3 Why must cells be relatively small?
Because volume increases faster than surface area,
and if it gets too big, it will starve or be poisoned