Question 1

Which of the following best describes the first step in the hypothesized origin of life on Earth?

Accepted Answer

Synthesis of small organic molecules from inorganic molecules such as $$N_2$$, $$NH_3$$, $$CO_2$$, $$H_2$$, and $$H_2O$$

Question 2

What role did lightning and volcanic eruptions play in the origin of life on early Earth?

Accepted Answer

They provided energy for the synthesis of organic molecules from inorganic precursors

Question 3

Which environment is hypothesized to have been a likely site for the first production of organic compounds on Earth?

Accepted Answer

Deep-sea hydrothermal vents with temperatures between $$40-90^{\circ}C$

Question 4

Which of the following is NOT one of the four hypothesized steps in the origin of life?

Accepted Answer

Development of multicellular organisms

Question 5

What is the significance of montmorillonite clay in the formation of protocells?

Accepted Answer

It facilitates the formation of vesicles from precursor molecules, increasing the rate of protocell formation

Question 6

Which molecule is thought to have carried genetic information and catalyzed chemical reactions in early protocells?

Accepted Answer

RNA

Question 7

What evidence supports the hypothesis that amino acids could have formed on early Earth?

Accepted Answer

Amino acids have been synthesized in simulated volcanic eruptions and found in meteorites

Question 8

Which event marks the beginning of the 'Oxygen Revolution' in Earth's history?

Accepted Answer

A dramatic increase in atmospheric $$O_2$$ due to photosynthesis by early prokaryotes

Question 9

According to the endosymbiotic theory, which organelle originated from a photosynthetic prokaryote living inside another cell?

Accepted Answer

Chloroplast

Question 10

Which of the following best describes the Cambrian explosion?

Accepted Answer

A sudden increase in animal species diversity during the Cambrian period (535-525 mya)

Question 11

What is the main consequence of mass extinction events in the history of life?

Accepted Answer

They are often followed by adaptive radiations, where many new species evolve

Question 12

Which process explains the rise of new species after a mass extinction event?

Accepted Answer

Adaptive radiation

Question 13

Which of the following is an example of exaptation?

Accepted Answer

Bones that originally formed a jaw hinge in reptiles later became part of the mammalian ear for sound transmission

Question 14

What is paedomorphosis?

Accepted Answer

The retention in an adult organism of juvenile or larval features of its evolutionary ancestors

Question 15

Which of the following best explains why the fossil record is important for understanding the history of life?

Accepted Answer

Fossils document key events and transitions in the history of life on Earth

Question 16

Which of the following is a direct consequence of continental drift?

Accepted Answer

Environmental changes that can lead to allopatric speciation

Question 17

Which of the following statements about the rise and fall of dominant groups is correct?

Accepted Answer

Dinosaurs dominated terrestrial ecosystems for about 135 million years before going extinct

Question 18

Which of the following best describes heterochrony?

Accepted Answer

An evolutionary change in the rate or timing of developmental events

Question 19

Which of the following is a real-world example of adaptive radiation?

Accepted Answer

The diversification of mammals into many species after the extinction of dinosaurs

Question 20

Which of the following best explains why evolution is not goal-oriented?

Accepted Answer

Evolution is driven by random mutations and natural selection, not by a predetermined plan

The History of Life on Earth (Ch. 25): Origin, Key Events, and Evolutionary Patterns

Study Guide - Practice Questions