Class notes
LEC 1-5
- Course
- Institution
IF you need to revise for upcoming exams you are welcome to use my notes
[Show more]
Seller
Follow
noodledoodle
Content preview
Documents BIO 1140Cells: Structure and varieties
-All living things (organism) are built from cells
Cell: a small membrane bound unit filled with a concentrated aqueous solution of chemicals
with reproduction capacity.
Biology is important for agriculture
-Dependence on other organisms
-Agriculture began 10 000 years ago
-Advance in crop production
-Genetics Engineering for climate challenges
Cell differs in size
E. coli is 1 micrometre
Frog egg is 1 micrometre
Most cell is 1-100 micrometre
Eukaryotic cell is 10-100 micrometre diameter
Why are cells small and large organisms made if many small cells?
To function, cells must maintain a large surface area to volume ratio
-When the cell gets bigger it needs gets more important.
If the cell volume is too big, but the surface is not too big to exchange that material, the cell
cant function.
-Accumulation of waste
Cells comes in a variety of shapes
Cell also differs in nutritional requirements
Cells became visible in the 17th century
, Robert Hook (put 2 lenses together) (1665)
Quark, a plant tissue
Anton, Van (1670) observed living organisms
Cell biology emerged by the publication of Matthias Shleiden (1838) -all plants are made of
cells, Shwann- all living things are made up of cells.
The cell Theory (1838)
Cells are the fund unit of life
All living organisms are composed of cells
Original theory
Modern cells evolve from a common ancestor
In light microscopes glass lenses and visible light are used to form an image
Light and electric microscopes
Magnification (1000X), resolution 200nm
See living cells
Bright field microscopy
Background is bright, hardly distinguish the cells
Phase contrast microscopy
Contrast is increased, this enhances light and dark regions in the cell and make it easier to
see details
Differential interference- contrast microscopy, 2 beams of polarized light
Stained bright-field microscopy a stain enhances contrast and reveal details
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller noodledoodle. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.50. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
52355 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now