Bio124S_07Present9

Bio124S_07Present9 - Cells Structures and Functions of the...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Cells Structures and Functions of the Basic Units of Life
Background image of page 1

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

View Full DocumentRight Arrow Icon
Cells Cells divide organisms into compartments. A cell can be an independent functioning unit. In higher organisms, cells become so specialized that they must rely on each other for the full range of functions. Cells themselves can be further divided into compartments.
Background image of page 2
Cell Theory - What Theory? Cells are the fundamental units of life. All organisms are composed of cells. All cells come from preexisting cells.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Cells Are Small - Microscopic A cell's size determines its surface area- to-volume ratio. Increasing volume decreases the surface area-to-volume ratio. The surface of a cell enables cellular exchange and communication with the cell’s environment.
Background image of page 4
Increase in Volume Decreases Area/ Volume Ratio
Background image of page 5

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

View Full DocumentRight Arrow Icon
Some Sizes of Biological Items
Background image of page 6
Some Sizes of Biological Items
Background image of page 7

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

View Full DocumentRight Arrow Icon
Parts of Cells Every cell is surrounded by a plasma membrane made up of a lipid bilayer with proteins floating within it and protruding (sticking out) from it. It is a “selectively permeable” barrier , enabling cells to maintain a constant internal environment. It exchanges information with adjacent cells and receives extracellular signals such as hormones. It exhibits molecules that are responsible for adhering to adjacent cells.
Background image of page 8
Prokaryotes and Eukaryotes (What about Archeae?) Prokaryotes have no nucleus or other membrane-enclosed compartments. They lack distinct organelles. Eukaryotes
Background image of page 9

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

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/08/2008 for the course BIO 124 taught by Professor Idk during the Fall '05 term at Bradley.

Page1 / 25

Bio124S_07Present9 - Cells Structures and Functions of the...

This preview shows document pages 1 - 10. Sign up to view the full document.

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