Exam 22: Evolution and the Origins of Life

The figure above shows the skeletal structure of the forelimbs of several vertebrates. Because these skeletal elements are similar in form and are believed to have evolved from a common ancestral structure, they are said to be

There are several sources of scientific evidence to support the theory of evolution. Match each of the following to its description. -study of homologous and analogous structures

The continents were once joined in one interconnected landmass called Pangaea, but moved slowly into their current positions. The process by which the continental (tectonic) plates moved slowly over time is called ________.

Extinction occurs when all individuals of a population die out.

There are several sources of scientific evidence to support the theory of evolution. Match each of the following to its description. -study of the early development of organisms

Comparative biochemistry is the science that examines similarities between molecules; the greater the difference between molecules that have the same function in two different species, the more distantly related the two species likely are.

Which of the following is true of radiometric dating?

All of the following are key elements of evolution EXCEPT which one?

There was no protective ozone layer early in Earth's history, which allowed Earth's surface to be bombarded with ultraviolet radiation.

The exact path that led to the evolution of modern cells and the organic molecules contained in these cells to support life is not known. The best guess is that some sort of self-replicating organic molecule formed along mudflats and most likely resembled

RNA is believed to have evolved before DNA and proteins.

There are several sources of scientific evidence to support the theory of evolution. Match each of the following to its description. -preserved remains of organisms

In the history of Earth and in the evolution of living cells, two self-replicating molecules have formed: DNA and RNA. Determine whether each of the following characteristics can be attributed to DNA or RNA. Answers may be used more than once. A) both DNA and RNA B) DNA C) RNA -more stable of the two molecules

The process of evolution ultimately depends on changes that occur in the ________ of organisms.

Differences in populations may arise over time when physical structures in the environment, such as mountains or large bodies of water, change. These structures are referred to as

Cytochrome c is a small protein that is found in present-day organisms. Comparison of the structure of cytochrome c from different organisms to infer evolutionary relationships would be part of the science involving

According to the modern theories on how life formed on Earth, prokaryotes are thought to have evolved before eukaryotes. Provide evidence to support that pattern of evolution based on the composition of the early Earth's atmosphere.

The following is a list of events that were involved in the formation of self-replicating living cells. Which one of the following best represents the order in which these events are believed to have occurred? 1. formation of RNA 2) enclosure of small organic molecules within a membrane 3) formation of simple organic molecules from atmospheric gases 4) formation of a lipid-protein membrane

Which one of the following is TRUE regarding fossils?

The theory that individuals with certain traits are more fit for their local environment and therefore are more likely to survive and reproduce is known as