News Broadcast

Materials: Microscopes, devices, assigned team member roles

Time: 30 minutesSource: Use information from slides 2 -

5

Instructions: In your groups, you will work together to create a news broadcast. This news broadcast will provide information on cells, cell theory, and microscopes.

All organisms are made from cellsCells are the basic unit of lifeSometimes called the building blocks of lifeUnicellularSome organisms are made from one cellExamples: Many bacteria are unicellularMulticellular Others are made from more than one

cell….Examples” Plant, animals and most fungi

How Cell theory developed…The invention of what instrument helped to advance what we know about cells?The microscope!!!First developed by a scientist called Robert Hook in 1665Simple light microscopeHe looked at a thin layer of cork He said there were ‘compartments’Later named them cellsAnother scientist called Anton Von LeeuwenhoekObserved small pond microorganismsCalled them ‘animalcules’

Modern Cell theoryNext 2 centuries lots of work was

done in this areaCells were found in every organismThis evidence led to the cell theoryThree parts:1. All living things are composed of

cells2. Cells are the basic unit of structure

and function in living things3. All cells come from pre-existing

cells

MicroscopesThese allowed scientists to study cellsThe early microscopes were light microscopesOnly good for viewing things the size of a bacteriumIn 1950s the electron microscope came into useInstead of light, uses a beam of electronsSome EM can magnify objects up to 1 million times!Scanning electron microscopesTransmission electron microscopesCan look at the detail inside the cellA picture taken with a microscope is called a micrographMagnification is written as 2000x