BIOLOGY
Topic 2: Cell Theory
Cell Theory
The cell is the fundamental unit of life. List the three properties/processes which characterize
all cells on our planet:
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Cell Theory & the Experimental Method
All cells must arise from other cells, a process known as ____________________. However, we
used to believe that cells could arise from non-living entities (i.e. “spontaneous generation”).
Complete the following table summarizing the experimental process used by Louis Pasteur to
disprove this idea:
Controlled variables
Manipulated variable
Responding variable
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SCIENCE 10H -
Exceptions to Cell Theory
Life is diverse! Not all cells follow the “rules”. Explain why each of the following examples are
considered to be exceptions to cell theory:
1) VIRUSES
2) STRIATED MUSCLE
3) FUNGAL HYPHAE
Origins of Cells
➢ Explain why conditions on our planet were not initially favourable for the formation of
life.
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SCIENCE 10H -
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Complete the following table outlining the four requirements that must have been met in
order for early “protocells” for form on Earth:
Requirement
What it means
Evidence
Catalysis
Self-Assembly
Compartmentalization
Self-Replication
“LUCA”
➢ What is “LUCA”? What evidence do we have that supports this idea?
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Establishing a Timeline
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SCIENCE 10H -
List two methods that are used to estimate the dates of the first living cells and last universal
common ancestor:
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Linking Questions
1.
Discuss some limitations of the Miller-Urey experiment. (2)
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2.
Explain why the use of RNA as the first genetic material may have led to the evolution
of many diverse lifeforms. (2)
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SCIENCE 10H -