Unit Ome Flashcards
What is Abiogenesis also known as?
Spontaneous Generation
This theory suggested that non-living things could be transformed into living things.
What did early scientists conclude about non-living things?
They could be transformed into living things.
What experiment did Redi conduct to test the hypothesis of abiogenesis?
He tested whether rotting meat could be transformed into flies.
What was the control group in Redi’s experiment?
The sealed jar.
What was the outcome of Redi’s experiment?
Maggots and flies were only present in the experimental group.
How did critics respond to Redi’s results?
They believed circulating fresh air was necessary for abiogenesis.
What did John Needham’s experiments involve?
Boiling beef broth and sealing it in a closed container.
What was observed in Needham’s beef broth experiments?
The broth became cloudy and teeming with microbes.
Who dealt the final blows to the theory of abiogenesis in the mid 18th century?
Lazzaro Spallanzani and Louis Pasteur.
What did Spallanzani do differently in his experiment?
He boiled the broth longer and prevented contact with surrounding air.
What was the result of Spallanzani’s experiment?
The beef broth remained clear.
What is pasteurization?
A flash heating process that kills the majority of microbes.
What is the significance of Louis Pasteur’s observations?
They led to the practice of pasteurizing dairy products.
What invention in the 1600s helped scientists observe cells?
The microscope.
Who were the scientists that built the foundations for the Cell Theory?
Schwann and Schleiden.
What is the first principle of the Cell Theory?
A cell is the smallest unit of life.
What is the second principle of the Cell Theory?
All living things consist of one or more cells.
What is the third principle of the Cell Theory?
Cells can only arise from pre-existing cells.
