Transcript Cellular Components - holyoke

Chapter 7 - Pretest
Cellular
Components
Cell Theory
Overview of Cell Structure
Cytoplasmic Organelles
First….check this out…
http://www.youtube.com/watch?v=6E1zh6ukcOU
CELL THEORY
 A theory resulting from many scientists’
observations & conclusions
CELL THEORY
1. The basic unit of life is the cell.
(Hooke)
 In 1665, an English scientist
named Robert Hooke
made an improved
microscope and viewed thin
slices of cork viewing
plant cell walls
 Hooke named what he saw
"cells"
CELL THEORY
2. All living things are made of 1 or more
cells.
 Matthias Schleiden (botanist studying
plants)
 Theodore Schwann (zoologist studying
animals) stated that all living things were
made of cells
Schwann
Schleiden
CELL THEORY
3. All cells divide & come from old cells.
(Virchow)
Virchow
Overview of Cell Structure
 Cells vary in size,
shape and function
 Control center of the
cell – Nucleus
 Cell contains fluid
filled cytoplasm
 Cell is surrounded by
a membrane
Eukaryotes vs. Prokaryotes
 All life on Earth can be divided into 2
categories, depending on whether they
contain a nucleus.
 Eukaryotes (do) and Prokaryotes (do not)
EUKARYOTES
 The cells of a eukaryote are complex and
contain a nucleus and other membrane
bound structures.
 Examples include: animals, plants,
protists, and fungi.
 Eukaryotes are multicellular with the
EXCEPTION of protists and yeasts
(single-celled fungi)
EUKARYOTE
PROKARYOTES
They carry out every activity associated with
living things (growth, reproducting, respond to
stimuli…see characteristics page 16&17)
 Are bacteria
 Have a much simpler structure with no internal
membranes, and lack well defined nucleii
 These simple prokaryotes colonized the Earth
2 billion years before Eukaryotes ever showed
up!!
PROKARYOTE
Prokaryote vs. Eukaryote
Prokaryote or Eukaryote??
Prokaryote or Eukaryote??
Prokaryote or Eukaryote??
Chapter 7 of Student Text
 Assignment: Q 1-5 on Page 173