Question 1

Which of the following best describes the sequence of events hypothesized to have led to the origin of life on early Earth?

Accepted Answer

Abiotic synthesis of small organic molecules, joining of small molecules into polymers, packaging of molecules into protocells, origin of self-replicating molecules

Question 2

The Miller-Urey experiment provided evidence for which of the following?

Accepted Answer

The abiotic synthesis of organic molecules under conditions similar to those of early Earth

Question 3

Which of the following is NOT a line of evidence supporting the endosymbiotic theory for the origin of mitochondria and plastids?

Accepted Answer

Both organelles can be formed de novo in eukaryotic cells

Question 4

Which radioactive isotope is most useful for dating fossils less than 75,000 years old, and what is the relevant decay equation?

Accepted Answer

Carbon-14; $$N_t = N_0$ e$$^{-\lambda t}$$

Question 5

Which of the following best explains why the fossil record is biased?

Accepted Answer

It favors species that were abundant, widespread, and had hard parts

Question 6

What major evolutionary innovation is associated with the 'Oxygen Revolution' about 2.4 billion years ago?

Accepted Answer

The evolution of oxygenic photosynthesis in cyanobacteria

Question 7

Which of the following statements about adaptive radiation is correct?

Accepted Answer

Adaptive radiation is the rapid evolution of many diversely adapted species from a common ancestor

Question 8

A scientist finds a fossil in a sedimentary rock layer above a layer dated to 300 million years ago and below a layer dated to 250 million years ago. What can be inferred about the age of the fossil?

Accepted Answer

It is between 250 and 300 million years old

Question 9

Which of the following best describes the process of allopatric speciation as it relates to continental drift?

Accepted Answer

Speciation occurs when populations are separated by a physical barrier, such as the movement of continents

Question 10

Which of the following is a real-world example supporting the endosymbiotic theory?

Accepted Answer

The use of antibiotics like tetracycline to target the apicoplasts of Plasmodium, the malaria parasite

Question 11

Which of the following best explains why RNA is considered a likely candidate for the first genetic material?

Accepted Answer

RNA can both store genetic information and catalyze chemical reactions

Question 12

Which of the following events is associated with the Cambrian explosion?

Accepted Answer

The sudden appearance of fossils resembling modern animal phyla

Question 13

A mass extinction event is best defined as:

Accepted Answer

A relatively short period in which a large percentage of Earth's species become extinct

Question 14

Which of the following is a plausible explanation for the Permian mass extinction?

Accepted Answer

Extreme volcanism in Siberia leading to global warming and ocean acidification

Question 15

Which of the following best describes the role of montmorillonite clay in the origin of life experiments?

Accepted Answer

It acts as a catalyst to increase the rate of vesicle formation from lipids

Question 16

Which of the following equations correctly represents the relationship between the number of radioactive parent isotopes remaining ($$N_t$$), the initial number ($$N_0$$), the decay constant ($$\lambda$$), and time ($$t$$)?

Accepted Answer

$$N_t = N_0$ e$$^{-\lambda t}$$

Question 17

Which of the following statements about the Anthropocene is correct?

Accepted Answer

It is a period during which human activity has been the dominant influence on climate and the environment

Question 18

Which of the following is a direct consequence of the rise in atmospheric oxygen due to cyanobacteria?

Accepted Answer

The formation of banded iron formations in ancient rocks

Question 19

Which of the following best explains why mitochondria and plastids are thought to have originated from bacteria?

Accepted Answer

They have circular DNA and prokaryotic-like ribosomes

Question 20

Which of the following is an example of adaptive radiation following the colonization of a new environment?

Accepted Answer

The diversification of Darwin's finches on the Galápagos Islands

Tracing Evolutionary History: Early Earth and the Origin of Life

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