Hypotheses about the origins of life (Khan A)

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The Oparin-Haldane hypothesis suggests that life originated from:

• a primordial soup of organic molecules

• extraterrestrial sources

• divine creation

• spontaneous generation

The Miller-Urey experiment provided the first evidence that organic molecules needed for life could be formed from ________ components.

• inorganic

• organic

• biological

• synthetic

Which hypothesis suggests that the first life was self-replicating RNA?

• RNA World Hypothesis

• Panspermia Hypothesis

• Endosymbiotic Theory

• Abiogenesis Hypothesis

True or False: Simple organic compounds might have come to early Earth on meteorites.

• True

• False

According to the key points, estimated time that life probably began on Earth:

• 4.5 billion years ago

• 3.5 billion years ago

• 2.5 billion years ago

• 1.5 billion years ago

What method is used to estimate the absolute age of the oldest rocks on Earth?

• Radiometric dating

• Superposition

• Dendrochronology

• Thermoluminescence

Stromatolites are:

• a type of rock formation created by the growth of layer upon layer of cyanobacteria.

• a type of ancient tree found in fossil records.

• a type of mineral found in volcanic regions.

• a type of sedimentary rock formed by volcanic activity.

The earliest fossils of microbes found in Australia date to about 3.4 billion years ago. What is their significance?

• They provide evidence of the earliest known life on Earth.

• They show that life existed on Mars.

• They indicate the presence of dinosaurs.

• They suggest that Earth was formed 3.4 billion years ago.

What did Miller and Urey find after letting the experiment run for a week?

• Amino acids

• Sugars

• Nucleotides

• Lipids