, Biology 101 Exam #1 SDSU Ekdale Complete Study Guide
2026 | Latest Update | Graded A+
1. What is the hypothetic-deductive approach primarily used for in scientific
research?
To test hypotheses through observation and experimentation.
To create theories without empirical evidence.
To analyze historical data only.
To collect data without forming hypotheses.
2. During Hurricane Marilyn, 15 green iguanas were blown out to sea from the
island of Guadalupe. They floated on mats of vegetation for several weeks
until they landed on the island of Anguilla. If these green iguanas evolve
reproductive barriers and become a new species, this would be an example
of:
sympatric speciation
allopatric speciation
postzygotic barrier
a miracle
none of the above
3. If a newly discovered organism is found to have a nucleus and membrane-
bound organelles, which domain would it likely belong to?
Archaea
Prokarya
Eukarya
, Bacteria
4. Over many generations, living things become better adapted to their
environment through the process of
Homeostasis
Symbiosis
Natural selection
Development
5. If a new organism is discovered that shares characteristics with both Fungi
and Animalia, how might this affect our understanding of evolutionary
relationships?
It could suggest a more complex evolutionary history and the
possibility of convergent evolution or hybridization.
It would have no impact on our understanding of evolutionary
relationships.
It would indicate that Fungi evolved from Animalia.
It would confirm that Fungi and Animalia are the only two major
clades.
6. You are studying a large population of snails when a new road is built,
splitting the habitat of the snail into two parts. The road is too wide for the
snails to cross it; any snail that tries dies from dehydration or gets killed by a
car. Twenty years later, you return and find the snails on the opposite sides of
the road look entirely different and will not breed with each other when you
try to mate them in captivity. Your snail population has undergone
founder's effect
a bottleneck
, K allopatric speciation K
K macroevolution
K sympatric speciation K
7. What is the term used to describe when one species splits to form two?
K K K K K K K K K K K K K
K Mechanical isolation K
K Isolation
K Sister species K
K Speciation
8. What is the primary evolutionary mechanism that leads to populations
K K K K K K K K K
becoming betteradapted totheirenvironments?
K K K K K K
K Natural selection K
K Gene flow K
K Genetic drift K
K Mutation
9. What is the term for the changes in DNA that lead to new traits in organisms?
K K K K K K K K K K K K K K K
K Genetic mutation K
K K Environmental factors K
K Genetic drift K
K Gene flow K
10. What is an adaptation in the context of evolutionary biology?
K K K K K K K K K
K A behavior that is learned over time.
K K K K K K
2026 | Latest Update | Graded A+
1. What is the hypothetic-deductive approach primarily used for in scientific
research?
To test hypotheses through observation and experimentation.
To create theories without empirical evidence.
To analyze historical data only.
To collect data without forming hypotheses.
2. During Hurricane Marilyn, 15 green iguanas were blown out to sea from the
island of Guadalupe. They floated on mats of vegetation for several weeks
until they landed on the island of Anguilla. If these green iguanas evolve
reproductive barriers and become a new species, this would be an example
of:
sympatric speciation
allopatric speciation
postzygotic barrier
a miracle
none of the above
3. If a newly discovered organism is found to have a nucleus and membrane-
bound organelles, which domain would it likely belong to?
Archaea
Prokarya
Eukarya
, Bacteria
4. Over many generations, living things become better adapted to their
environment through the process of
Homeostasis
Symbiosis
Natural selection
Development
5. If a new organism is discovered that shares characteristics with both Fungi
and Animalia, how might this affect our understanding of evolutionary
relationships?
It could suggest a more complex evolutionary history and the
possibility of convergent evolution or hybridization.
It would have no impact on our understanding of evolutionary
relationships.
It would indicate that Fungi evolved from Animalia.
It would confirm that Fungi and Animalia are the only two major
clades.
6. You are studying a large population of snails when a new road is built,
splitting the habitat of the snail into two parts. The road is too wide for the
snails to cross it; any snail that tries dies from dehydration or gets killed by a
car. Twenty years later, you return and find the snails on the opposite sides of
the road look entirely different and will not breed with each other when you
try to mate them in captivity. Your snail population has undergone
founder's effect
a bottleneck
, K allopatric speciation K
K macroevolution
K sympatric speciation K
7. What is the term used to describe when one species splits to form two?
K K K K K K K K K K K K K
K Mechanical isolation K
K Isolation
K Sister species K
K Speciation
8. What is the primary evolutionary mechanism that leads to populations
K K K K K K K K K
becoming betteradapted totheirenvironments?
K K K K K K
K Natural selection K
K Gene flow K
K Genetic drift K
K Mutation
9. What is the term for the changes in DNA that lead to new traits in organisms?
K K K K K K K K K K K K K K K
K Genetic mutation K
K K Environmental factors K
K Genetic drift K
K Gene flow K
10. What is an adaptation in the context of evolutionary biology?
K K K K K K K K K
K A behavior that is learned over time.
K K K K K K
