Question 1

Which of the following best describes the relationship between phylogeny and classification in modern biology?

Accepted Answer

Classification should reflect evolutionary relationships, grouping only monophyletic groups together.

Question 2

A single nucleotide change in the EphB2 gene in pigeons leads to a change from arginine (R) to cysteine (C) in the protein. What is the most direct effect of this mutation?

Accepted Answer

It causes a reversal of feather polarity on the back of the head, resulting in a crest.

Question 3

Which of the following is NOT a requirement for a molecule to be considered a ribozyme?

Accepted Answer

It must be able to replicate itself without any errors.

Question 4

Which process allows scientists to assign absolute ages to rocks and fossils?

Accepted Answer

Radiometric dating

Question 5

Why does radiometric dating using $$^{14}C$$ only work for materials up to about 50,000 years old?

Accepted Answer

The half-life of $$^{14}C is $$too short to detect older materials.

Question 6

Which of the following events occurred most recently in the history of life on Earth?

Accepted Answer

Colonization of land by vascular plants

Question 7

What is the main reason that the Cambrian explosion is so well represented in the fossil record?

Accepted Answer

Many organisms developed hard skeletons that fossilize well.

Question 8

Which of the following best explains why increased atmospheric oxygen led to the evolution of larger, more complex organisms?

Accepted Answer

Oxygen allows for more efficient aerobic metabolism, supporting higher energy demands.

Question 9

Which of the following is an example of a monophyletic group?

Accepted Answer

A group that includes an ancestor and all of its descendants.

Question 10

Which of the following best describes the process of abiotic synthesis in the origin of life?

Accepted Answer

Formation of organic molecules from inorganic precursors without biological intervention.

Question 11

A scientist finds a fossil in a lower stratum than another fossil. What can she conclude?

Accepted Answer

The fossil in the lower stratum is older.

Question 12

Which of the following is NOT a direct effect of plate tectonics on the history of life?

Accepted Answer

Increasing atmospheric oxygen through photosynthesis

Question 13

Which of the following is the correct order of major events in the history of life, from earliest to most recent?

Accepted Answer

Origin of life, photosynthesis, eukaryotes, multicellularity, Cambrian explosion, colonization of land

Question 14

Which of the following is a plausible reason why the earliest multicellular organisms remained small for hundreds of millions of years?

Accepted Answer

Low atmospheric oxygen limited the size and complexity of organisms.

Question 15

Which of the following best describes the process of continental drift?

Accepted Answer

The movement of lithospheric plates over the Earth's mantle, changing the positions of continents.

Question 16

A mass extinction event at the end of the Cretaceous period is associated with which of the following?

Accepted Answer

A large meteorite impact, as evidenced by a worldwide iridium layer.

Question 17

Which of the following is a key difference between microevolution and macroevolution?

Accepted Answer

Microevolution refers to changes within populations or species, while macroevolution refers to large-scale patterns over long time periods.

Question 18

Which of the following is the best definition of a 'protocell'?

Accepted Answer

A self-assembled vesicle with a lipid bilayer that can contain polymers.

Question 19

Which of the following is a real-world application of understanding the half-life equation in radiometric dating?

Accepted Answer

Determining the age of an archaeological artifact using the formula $$N = N_0$ e$$^{-\lambda t}$$, where N$ is the remaining radioactive atoms, N_0$ is the initial amount, $$\lambda$$ is the decay constant, and t$ is time.

Macroevolution, the Fossil Record, and Major Events in the History of Life

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