Cornell Notes Paper
Topic: 42 – A Closer Look
Main Topics
All living organisms are made
up of one or more cells
A Typical Cell
Cells to organisms
Date: 3/31/15
Source: SEPUP 58-61
Detailed Notes
 Ex. plants, animals, microbes (organisms too small to
be seen without microscope)
 microbes cause disease – often made of only one cell
 some structures are found in nearly all cells
 cell membrane (CM) –
o most common structure of cells
o separates cell from its environment
o a barrier to control what enters/leaves the cell
 cytoplasm –
o enclosed by CM
o means “cell material”
o breaks down nutrients from food
o builds new substances to grow/carry out other
functions
 nucleus –
o small dark center in many cells
o small compartment w/i the cell
o separated from rest of cell by nuclear
membrane
o contains genetic material (blueprints)
o directs cell activities (growth, reproduction)
 organelles –
o tiny structures that do many jobs in cells
o means “little organs”
o surrounded by their own membranes
o jobs:
 obtaining/storing energy
 movement
 cell division
 making substances used or transported
in the cell
 organelles (smallest) – cell – tissues – organs – organ
systems – organisms (largest)