Abiogenesis

What was the historical belief known as spontaneous generation?

• Life arises from pre-existing life.

• Life can emerge from non-living matter.

• Life is created by divine intervention.

• Life evolves through natural selection.

Which type of experiment helped disprove the theory of spontaneous generation by demonstrating that maggots on meat originated from flies?

• An experiment involving the synthesis of organic compounds from inorganic matter.

• An experiment using swan-neck flasks to prevent airborne microbes from reaching broth.

• An experiment comparing meat exposed to air with meat covered to prevent insect access.

• An experiment observing the growth of plants from seeds in soil.

What is the generally accepted sequence of stages in the chemical evolution of life from non-living matter on primitive Earth?

• Cells -> Monomers -> Protocells -> Life

• Monomers -> Protocells -> Cells -> Life

• Protocells -> Monomers -> Cells -> Life

• No Life -> Cells -> Monomers -> Life

What was a significant characteristic of the primitive Earth's atmosphere that was crucial for the initial formation of life?

• High concentration of oxygen (O2)

• Presence of complex organic molecules

• A reducing atmosphere lacking free oxygen

• Abundance of ozone (O3)

Which of the following gases was intentionally excluded from the simulated primitive atmosphere in the Miller-Urey experiment?

• Water vapor

• Methane

• Oxygen

• Ammonia

What was a significant outcome of the Miller-Urey experiment?

• It demonstrated the spontaneous generation of complex living organisms.

• It showed that Earth's early atmosphere contained abundant free oxygen.

• It successfully synthesized simple organic molecules, such as amino acids, from inorganic precursors.

• It created the first self-replicating genetic material in a laboratory.

What are the two main competing hypotheses discussed regarding the sequence of events in the origin of life, concerning the initial appearance of complex biological molecules?

• Photosynthesis First and Respiration First

• DNA First and Protein First

• Genes First and Metabolism First

• Prokaryotes First and Eukaryotes First

What is considered the earliest fossil evidence of life on Earth, dating back approximately 3.5 to 3.8 billion years ago?

• Trilobites

• Stromatolites

• Dinosaur bones

• Mammoth tusks