Bio 2300 Unit 4 Concept Exam 2025 with Verified Solutions
What summarizes the RNA world hypothesis? RNA was the first biomolecule to evolve
and did so before DNA and proteins.
Which of the following can scientists learn about from studying fossils?
Select all that apply. cellular structure how extinct organisms moved
Which option correctly describes how Earth's temperature has changed during its
history? Earth was initially very hot. It gradually cooled down.
Which options describe Darwin's theory of natural selection?
Select all that apply. Evolution occurs because of natural selection.
Natural selection results in descent with modification.
Which theory suggests that life on Earth originated from microbes carried to Earth by
meteorites or comets? panspermia
How does polyploidy cause speciation? Polyploidy is a mutation. The individual with the
mutation can reproduce and form a new species.
In a phylogenetic tree, what does the distance between branches represent? the amount
of evolutionary change
What summarizes the RNA world hypothesis? RNA was the first biomolecule to evolve
and did so before DNA and proteins.
Which of the following can scientists learn about from studying fossils?
Select all that apply. cellular structure how extinct organisms moved
Which option correctly describes how Earth's temperature has changed during its
history? Earth was initially very hot. It gradually cooled down.
Which options describe Darwin's theory of natural selection?
Select all that apply. Evolution occurs because of natural selection.
Natural selection results in descent with modification.
Which theory suggests that life on Earth originated from microbes carried to Earth by
meteorites or comets? panspermia
How does polyploidy cause speciation? Polyploidy is a mutation. The individual with the
mutation can reproduce and form a new species.
In a phylogenetic tree, what does the distance between branches represent? the amount
of evolutionary change
