A Tour of the CellIntro: Sections 4.1-4.3

An Introduction to the Cell

• Art and Science (pgs 50-51)• Microbiologists

– Leeuwenhoek = “animalcules”– Hooke = “cells”

• Cell Theory– All living things are made up of cells and come

from cells

Microscopes• Resolution:

– ability to show two close objects as separate– Human eye can’t resolve things smaller than 1/10 mm

• Light Microscope:– Can see things 1,000 times larger than the “naked” eye– Labeling

• Electron Microscope: – magnifies up to 100,000 times – must be used in a vacuum, non living

• SEM- surface• TEM-through a specimen

Logarithmic Scale

Surface Area to Volume Ratio• The smaller the cell, the larger its SA:V ratio

– As the cell grows larger, it has much less surface area than volume making it more difficult to absorb nutrients and dispose of wastes.

Ex:CR North

and South

Prokaryote

• 1/10 – 1/1000 the size of eukaryotes• nucleoid region • Special structures

Plant and Animal Cellular Structure

–Sections 4.4-4.19–Group project –Labeling–Labs–TEST next Friday March 11th