Date: October 25, 2016
Aim #20: How do enzymes control the rate of
chemical reactions?
Do Now: Write down one question you still
have about this unit or one topic you would
like to review.
HW:
1) Study!
2) Textbook HW due day of test! (Tomorrow!)
Date: October 28, 2016
Aim #24: How was the cell theory developed?
Do Now: Complete the following statements.
1)
All living things are made up of one or more
_____________.
2)
___________ is the increase in cell size or cell number.
3)
___________ organisms are made up of ONE cell (i.e.
bacteria)
4)
___________ organisms are made up of MANY cells (i.e.
humans)
HW:
1) “Dog Ate My Homework” article review
2) Quarterly Exam Thursday 11/3 (period 1),
Friday 11/4 (period 5)
The Wacky History of the Cell
Theory
http://ed.ted.com/lessons/the-wacky-history-of-cell-theory
Aim #24:
How was the cell theory
developed?
1) Unicellular vs. Multicellular
◦Unicellular- made
up of ONE cell
◦Multicellular- made
up of MORE
THAN ONE cell
Organization of Living Things…
Cells  Tissues  Organs  Organ
Systems  Organisms
2) What are the four characteristics
of life?
◦ Cells: Basic units of structure & function
◦ Metabolism: Chemical reactions in cells
◦ Homeostasis: Internal Balance
◦ Reproduction: Produce offspring
What instrument was vital for scientists to
discover and learn more about cells?
3) Visible light passes through an
object & glass lenses then enlarge
the image & project it into the
human eye.
4) This instrument allows scientists to
see larger parts of a cell (cell
membrane, nucleus, chromosomes,
etc…)
Light Microscope
5) A light microscope can magnify
objects up to 1000 times.
A Brief History of Cells
https://app.discoveryeducation.com/learn/videos/0F349698-ABEF-46B6-BC7C5E2162505768?hasLocalHost=false
Anton Van Leeuwenhoek
1600s
◦ Developed simple
light microscopes that
allowed him to
examine tiny living
organisms he called
“animacules”
Robert Hooke
1665
What is this?
First compound
microscope
Cork Cells
First person to use the word
“cell”
Matthias Schleiden
1838
◦ ALL PLANTS ARE
MADE UP OF
CELLS!!
Theodor Schwann
1838
◦ ALL ANIMALS
ARE MADE UP OF
CELLS!!
Rudolf Virchow
1858
◦ CELLS COME FROM
PRE-EXISTING
CELLS!
6) What are the three parts of the
cell theory?
◦ All living things are
made of cells
◦ Cells are the basic
unit of structure and
function (metabolism)
◦ New cells come from
pre-existing cells
7) What are some exceptions to the
cell theory?
1) Viruses.
◦ Are viruses living?
◦ contain genetic material and protein but are
smaller than cells and cannot reproduce outside
of a cell.
2) The first cell.
◦ Where did the first cell come from?
◦ could not have arisen from a previously existing
cell.
3) Mitochondrion and Chloroplasts
◦ contain their own genetic information and can
replicate on their own inside of cells.
Viruses
◦They are not
made up of
cells, but are
they living?
What do you know about
viruses?
◦ They can make you
very sick
◦ They can be
transmitted from
person to person
◦ There are different
types of viruses
8) How big is a virus?
◦ Too small to be seen
with a light
microscope.
◦ They are microscopic
and smaller than
cells!!
9) What instrument allows scientists
to see viruses?
◦ Electron
Microscope!
10) What are four features of an
electron microscope?
◦ Used to view extremely small
structures inside cells &
viruses
◦ Utilizes an electron beam
instead of a light beam
◦ Can magnify up to a million
times
◦ Subject must be dead and dry
11) So… is a virus classified as a
living thing?
◦NO! A virus is nonliving
◦Viruses cannot reproduce,
they must invade a host cell
in order to replicate!
Introduction to Viruses Video
https://app.discoveryeducation.com/learn/videos/2D78711C48C2-454B-91B0-6F95863F04D0?hasLocalHost=false
13) Let’s compare and contrast
viruses and bacteria
Bigger than a virus
Smaller than bacteria
Virus has spiky outer
skin
Viruses do not have
enough DNA blueprints
to reproduce. Must
invade a host cell.
Discovered by Martinus
Benjerunck in 1898
It has complex structure
Both cause
disease
Both contain
DNA and
enzymes
Rigid cell wall
Bacteria has lots of
DNA blueprints to
reproduce.
First discovered by
Anton Van
Leeuwenhoek in 1670
NPR: Flu Attack! How a virus
invades your body
◦ https://www.youtube.com/watch?v=Rpj0emEGShQ