Lec3 Cell Structure

Lec3 Cell Structure - Biol 115: Cell Structure and Function...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
Biol 115: Cell Structure and Function T. Bekyarova, Jan 2003
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Readings Chapter 3
Background image of page 2
The human body consists of 75 trillion cells  that vary considerably in shape and size yet  have much in common.    Differences in cell shape make different  functions possible.   
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
The Cell Theory Robert Hooke (late 1600's) coined the word "cell" by looking at cork Van Leeuwenhook (mid-late 1600s) observed first unicellular animals Schleiden(1838) (plants), Schwann (1839) (animals), Virchow (1850s) "Every animal is composed of vital units each of which bears in itself the complete characteristics of life"
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A More Modern Formulation of the Cell Doctrine: 1) A cell is the basic unit of life 2)All living things are made up of cells and c ells contain everything necessary for life 3)New cells arise from preexisting cells What about things like viruses and prions? Are they alive? Need cells to reproduce.
Background image of page 8
Why are most cells small? Consider the cell surface-area-to-volume ratio: Small cells have a larger amount of surface area compared to the volume An increase in surface area allows for more nutrients to pass into the cell and wastes to exit the cell more efficiently There is a limit to how large a cell can be and be an efficient and metabolically active cell
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Surface to Volume Ratio
Background image of page 10
What are some common microscopes used to view cells? Most human cells are 10–15 μ m in diameter With naked eye you can see about 100 µm (10 -6 meter) Compound light microscope Lower magnification - up to 1200 Visible light produces image Resolution – ability to reveal detail Micron scale structures (200 nm up) Stained specimens - histology
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Light Microscopy Fluorescence microscopy label with dyes that absorb UV and emit visible light can see things much smaller than resolution limit of microscope much of what we know about cytoskeleton discovered this way. Cell Division Triple fluorescence staining of division of a Chinese hamster ovary cell.
Background image of page 12
Electron Microscopy Scanning electron microscopy Resolution -1nm's to 20 of nm typically need to metal coat specimens 3-D image Uses electrons to view surface structures High magnification, no live specimens Transmission electron microscopy 2-D image Uses electrons to view internal structure High magnification, no live specimens thin section, cryo, negative stain
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Transmission EM Light (Stained) Scanning EM Sperm Flagellum
Background image of page 14
What are the two major types of cells in all living organisms?
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2009 for the course CS 430 taught by Professor Kapoor during the Spring '08 term at Illinois Tech.

Page1 / 61

Lec3 Cell Structure - Biol 115: Cell Structure and Function...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online