AP_Unit 7_ Early Earth and Prokaryotes

Cyanobacteria changed the atmosphere by adding oxygen to the air from the process of

• photosynthesis

• cellular respiration

• decomposition

• nitrogen synthesis

Which question were the scientists trying to answer with this experiment?

• Where do cells come from?
• How did prokaryotes form cell membranes?
• How are biomolecules formed?
• What gave rise to the Eukaryotic cell?

Miller/Urey and other scientists have shown that:

•  Life on early Earth required material from space
• Cells survived in the primitive atmosphere
• Amino acids could be produced from inorganic molecules 
• Simple cells can be produced in a laboratory

Earth formed 4.5 billion years ago, but life did not show until around...

• 3.5 billion years ago
• 1 million years ago
• 200,000 years ago
• 4.2 billion years ago

Which of the following was probably not present in the atmosphere of the primitive Earth? 

• methane
• oxygen
• water
• carbon dioxide

Which statement best describes conditions on early Earth?

• hot with volcanic activity and electrical storms
• dry land covered with volcanic dust
• cold oceans
• dark and dusty with abundant water

Which type of cell came first?

• Eukaryotic
• Prokaryotic
• Plant
• Both Eukaryotic and Prokaryotic cells evolved around the same time

Which scientist proposed the 5-kingdom classification system?

• Linneaus

• Whittaker

• Oparin and Haldane

• Miller and Urey

In Whittaker's classification system, eukaryotes were divided into three main groups: plants, animals, and fungi. The organisms were assigned one of these kingdoms based on their _________________.

• mode of transformation

• mode of replication

• mode of locomotion

• mode of nutrition

What are 'protobionts'?

• A collection of organic molecules surrounded by a lipid membrane
• Building blocks of lipids
• Complex catalysts that existed on early Earth
• Abiotic polymers