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27 Cards in this Set
- Front
- Back
Which gases were the main gases in Early Earth? |
Methane |
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Which gases were not present in Early Earth? |
Carbon Dioxide |
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What were the implications of organic molecules in the origin of the Earth? |
75% of interstellar molecules were organic, however it was agreed that they could only exist under certain conditions. |
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Describe the theory of panspermia |
Panspermia is a theory that origin of life on earth was through meteorites which hit the earth. In 1970's some of these meteorites were found to contain amino acids, the building block of life. |
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What may this theory not be true? |
Some scientists believe that life could not thrive on a meteorite for thousands of years and also could not survive the impact faced when the meteorite crashes to the Earth. |
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What was Haldane and Oparin's Theory? |
They believed that life started as a result of the conditions present in Early Earth. They believed that the lightning in the earth reacted with the molecules to form life. |
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What was the theory of sea vents? |
The theory that life started in deep sea vents was unlikely however people could not explore it as the conditions were too rough. |
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What was Urey and Millers Experiment? |
Urey and Miller conducted the experiment in which they send electrical currents into a flask containing methane, hydrogen, ammonia and water and after a week discovered that amino acids had formed. |
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Identify changes in technology which have assisted to understanding the origins of life on Earth. |
-Deep sea equipment allows for exploration of remote locations such as deep sea trenches. |
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List major stage of evolutions of living things: |
-Organic Molecules |
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List Paleontological Evidence the life started on earth. |
-fossils resembling cyanobacteria found in stromatolites that are 3.5 billion years in Australia and Africa. |
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List Geological Evidence that life started on earth. |
-Ancient rocks which contain chemical evidence that the metabolism of stromatolites was underway |
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Why was the shaft from anoxic to an oxic environment significant? |
-Aerobic organisms were able to use energy more efficiently through respiration |
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Describe some cultural conflicts about the origin of earth. |
-Aboriginal people believed supernatural beings existed in the dreamtime and created the earth. |
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Archaebacteria |
-Hostile Environments |
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Eubacteria |
-All habitats |
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Cyanobacteria |
-Mainly in Marine Environments |
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Nitrogen-fixing Bacteria |
-Live mutualistically on roots of legume plants |
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Methanogens |
-Anaerobic Environments |
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Deep Sea Bacteria |
-Boiling undersea vents of volcanoes |
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Why do scientist classify organisms |
-allows organism to be quickly and accurately described |
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Levels of Classification: |
Kingdom |
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What are the effects of technological advancements on the biological classification systems? |
-Enabled us to make comparisons at cellular and molecular levels. ( This is thanks to Biochemical techniques which allow us to obtain sequences of animo acids.) |
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What are abiotic factors? Give Examples: |
Abiotic factors are those which are non living such as - Oxygen Availability |
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What are biotic factors? Give Examples: |
Biotic factors are those which are living such as: |
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What is photosynthesis? |
Photosynthesis is the process by which plants convert carbon dioxide and water to make glucose through the use of sunlight. |
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What is respiration? |
Respiration is the process in which organic molecules are broken down to produce carbon dioxide and water and energy is released ( ATP ) |