Study Guides (248,246)
Canada (121,429)
Biology (1,099)
BIOL 120 (21)

notes 1.docx

3 Pages
Unlock Document

BIOL 120
Simon Cheung

Lecture 1 Importance of plants:  Photosynthesis sustains life on earth - oxygen release, energy via food chains, organic compounds)  Important food source  Medicine come from plants - about 255 of all pharmaceuticals are made from plant extracts  Plants provide a variety of useful products - fuel, shelter, paper, food, biofuels, etc.  Valuable resource for remediation, enhancing quality of life, and scientific discovery Organisms are made up of cells  1.  All living organisms are made up of one or more cells\  2.  Cells are typically 1-300 µm in diameter (1 µm is equal to 1/1000 of a mm)  3.  Cells were discovered by Robert Hooke (1635-1703)  4.  Hooke used the term “cell” because the tiny compartments making up the slice of bark reminded him of a monk’s cell  5.  “Cell” Latin, cellula , meaning “small room” Cell Size  Cell size is limited by a need to maintain a surface area that will allow for exchange of oxygen, water and nutrients for a given volume  Microscopes aid in visualization of structures beyond the resolution of the human eye. Light (visible light - power only up to 200nm) and electron microscopy are used to enhance resolution. Plants are composed of cells  In the mid-1800s a general theory emerged about the nature and significance of cells  In 1838, German botanist Matthias Schleiden concluded that microscopic studies confirmed that plant parts are composed of cells (cell walls made it easy to identify individual cells)  Not until a year later did German biologist Theodor Schwann confirmed that animals are also composed of cells Cell Theory  The cell is the basis of an organism’s structure and reproduction 1.  Organisms are made up of one or more cells 2.  A cell is the basic unit of structure for all organisms Lecture 1 3.  Cells arise only from existing cells Prokaryotic or Eukaryotic  First forms of life on earth were prokaryote
More Less

Related notes for BIOL 120

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.