Cell Theory and Origin of Life Lecture

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Fill-in-the-blank flashcards covering spontaneous generation, biogenesis, major experiments, microscope types, key scientists, and the three postulates of Cell Theory.

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25 Terms

1
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The ancient idea that life could regularly arise from non-living matter is called __.

spontaneous generation

2
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The principle that all life today arises only by the reproduction of pre-existing life is known as __.

biogenesis

3
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In Francesco Redi’s experiment, covering the meat with gauze prevented the appearance of __.

maggots

4
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Louis Pasteur’s 1862 experiments with microbes conclusively disproved __.

spontaneous generation

5
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Robert Hooke coined the word __ after observing cork through a microscope in 1665.

cell

6
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A microscope that projects visible light through a specimen is called a __.

light microscope

7
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A microscope that uses a beam of electrons and can resolve objects as small as 0.2 nm is the __.

electron microscope

8
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A __ electron microscope (SEM) is used to study detailed architecture of the cell surface.

scanning

9
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A __ electron microscope (TEM) is especially useful for exploring the internal structure of a cell.

transmission

10
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Anton van Leeuwenhoek, in 1676, described tiny living organisms he called __.

animalcules

11
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Robert Brown discovered the __ in plant cells in 1831.

nucleus

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Felix Dujardin in 1835 named the cell’s internal substance __.

sarcode

13
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Jan Evangelista Purkinje later called the cell’s internal colloidal material __.

protoplasm (cytoplasm)

14
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Matthias Schleiden stated in 1838 that all __ are composed of cells.

plants

15
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Theodor Schwann concluded in 1839 that all __ are composed of cells.

animals

16
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Rudolf Virchow declared in 1858 that all living cells come from __ living cells.

pre-existing

17
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Cell Theory Postulate 1: All living organisms are composed of __.

cells

18
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Cell Theory Postulate 2: The cell is the basic __ of life.

unit

19
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Cell Theory Postulate 3: Cells arise only from __ cells.

pre-existing

20
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The invention of the __ made the development of Cell Theory possible.

microscope

21
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Because of harsh early-Earth energy sources like lightning and UV radiation, conditions for __ may once have existed even though none occur today.

spontaneous generation

22
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A cell is the lowest level of structure that can perform all activities required for __.

life

23
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The most familiar type of microscope that students first learn to use is the __ microscope.

light

24
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The phrase “life-from-life” is another way to describe the principle of __.

biogenesis

25
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The scientist credited with first observing red blood cells and sperm cells was __.

Anton van Leeuwenhoek