This document provides an introduction to General Biology I and the cell theory. It discusses how bacteria were first discovered by Anton van Leeuwenhoek using an early microscope. Robert Hooke coined the term "cell" after observing cork bark. The cell theory states that all living things are made of cells, cells are the basic unit of structure and organization, and new cells are produced from existing cells. Key contributors to cell theory included Robert Hooke, Anton van Leeuwenhoek, Mathias Schleiden, and Theodor Schwann. The document also outlines cell functions like metabolism, response, and homeostasis. It defines proprioception as the ninth sense and describes abnormal proprioception symptoms. Finally, it provides discussion questions about

1. Welcome to General
Biology I

2. Observe the images on the screen

3. The Cell Theory

4. Guide
Questions
How were bacteria first
discovered?
How did Robert Hooke come up
with the term ‘cell’?
How did Rudolf Virchow
contribute to the cell theory?
What is the benefit of discovering
the cell theory?

6. Cell theory
All living organisms are composed
of one or more cells.
The cell is the basic unit of
structure and organization in
organisms.
Cells arise from pre-existing cells.

7. • Which is not a part of the cell theory?
• What was Robert Hooke’s contribution to cells?
• What is a benefit of the cell theory?
• What does “cells come from other cells” mean?

8. • What impact has the cell theory had on the modern day world in
which we live?

9. Robert Hooke — named the cell base
observations on cork bark
Anton van Leeuwenhoek — improved the
microscope and observed bacteria and one-cell
animals
Mathias Schleiden — all plant tissue is made of
cells
Theodor Schwann — all animal tissue is made
of cells

10. Functions of Cells
• Metabolism- chemical reactions
inside the cell
• Response — perceiving and
responding to changes in the
environment
• Homeostasis keeping conditions
inside the organism within tolerable
limits (balanced)

11. Bio-Bits
(Trivia of the Day)

12. …that we have
9 senses?

13. 9 senses
• Vision
• Hearing
• Smell
• Taste
• Touch
• Balance
• Temperature
• Proprioception
• Pain

14. Proprioception
is the body’s ability to sense its
location, movements, and
actions.
It’s the reason we’re able to
move freely without consciously
thinking about our environment.

15. Abnormal proprioception causes symptoms that
can interfere with even the simplest activities.
• balance issues, such as having trouble standing on one foot or
frequent falls while walking or sitting
• uncoordinated movement, such as not being able to walk in a straight
line
• clumsiness, such as dropping or bumping into things
• trouble recognizing your own strength, such as pressing on a pen too
hard when writing or not being able to gauge the force needed to pick
something up
• avoiding certain movements or activities, such as climbing stairs or
walking on uneven surfaces because of a fear of falling

16. Directions: On a yellow paper
answer the question as part of
their assignment.
1. Why do you believe so
many scientists were involved in
the development of cell theory?
2. What impact has the cell
theory had on the modern day
world in which we live?
3. Identify and describe the
different structure and functions
of the cells.