BIOL 2010 Lecture Notes - Lecture 3: Glycoprotein, Motility, Coffee Filter

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Published on 22 Feb 2017
School
TNTECH
Department
Biology
Course
BIOL 2010
Professor
Chapter 3 Cellular Form and Function
Cytology the study of cells
o Why?
Cells are responsible for the structural and functional properties of living
organisms
o One of the major unifying theories of biology is cell theory
Living things are made of cells
Cell Size
o Cells are very small
Most are 10-15 micrometers wide
Length can vary considerably
A few micrometers to a little over a meter long
Size limited by surface area to volume ratio limits
Diffusion (discussed later) no longer functionally effective in
larger cells
Basic Components of the Cell
o Cells vary in their internal composition
It’s a form and function thing
o But all living cells have:
Plasma membrane
Can vary in composition within a single cell depending on location
Cytoplasm
Made of cytosol (or intercellular fluid [ICF]) and the organelles
dissolved in it
o Fluid surrounding the cell us considered the extracellular fluid (ECF)
Focusing on the Cellular Membrane
o The cell membrane is important because it is the site of many physiological
processes
o Traits of the membrane:
Semipermeable
Acts as a barrier to prevent entry of certain materials while
allowing the entry of others
Acts as a boundary
Edge of the cell
Interactions with other cells often occur at the plasma membrane
Structure of the Plasma Membrane
o Often referred to as a phospholipid bilayer
A little deceiving though
o Mostly made up of lipids (98% by composition) and most of those (75%) are
phospholipids
Cholesterol (20%) and glycolipids (5%) make up the remaining portion
o Proteins make up the remaining 2% in composition but 50% of the membrane buy
weight
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Document Summary

Cells are responsible for the structural and functional properties of living organisms: one of the major unifying theories of biology is cell theory. Cell size: cells are very small. A few micrometers to a little over a meter long. Size limited by surface area to volume ratio limits. Diffusion (discussed later) no longer functionally effective in. Basic components of the cell larger cells: cells vary in their internal composition. It"s a form and function thing: but all living cells have: Can vary in composition within a single cell depending on location. Made of cytosol (or intercellular fluid [icf]) and the organelles dissolved in it: fluid surrounding the cell us considered the extracellular fluid (ecf) Focusing on the cellular membrane: the cell membrane is important because it is the site of many physiological processes, traits of the membrane: Acts as a barrier to prevent entry of certain materials while allowing the entry of others.

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