BIO 150 Midterm Exam Study Guide | Latest Update 2026/2027
1. The Chemical Evolution hypothesis proposes that...
Life evolved on Earth through natural chemical processes
Life evolved on Earth everywhere at once
Life evolved outside Earth and was deposited here by meteorites
Life evolved on Earth many separate times
2. When does speciation occur?
Two populations have different food sources
One population changes its primary food source
Two populations can no longer mate successfully
3. If a population of birds becomes geographically isolated due to a mountain
range, what is the likely outcome over time in terms of speciation?
The population may undergo speciation due to the lack of gene
flow between the isolated groups.
The population will become extinct due to isolation.
The population will remain unchanged and maintain genetic
uniformity.
The population will merge with another species.
4. If a newly discovered organism lacks one of the five requirements of life,
what implications does this have for its classification as a living entity?
It can still be classified as a living organism based on its genetic
material.
, It can be considered a living organism if it shows signs of
reproduction.
It may not be classified as a living organism if it cannot meet all five
requirements.
It will be classified as a prokaryote regardless of its requirements.
5. What is the definition of chemical evolution?
The process of natural selection acting on genetic variation.
The classification of organisms based on shared characteristics.
The process by which simple organic compounds are transformed
into more complex molecules.
The development of cellular metabolism in prokaryotes.
6. What are the four defining features that characterize prokaryotic cells?
They lack a nucleus, are unicellular, have a cell wall, and have
circular DNA.
They lack a nucleus, are multicellular, have a cell membrane, and have
linear DNA.
They have membrane-bound organelles, are unicellular, have a cell
wall, and have circular DNA.
They have a nucleus, are multicellular, lack a cell wall, and have linear
DNA.
7. Based on the biological species concept, speciation occurs __________
when mutations generate observable differences between two groups
able to interbreed
1. The Chemical Evolution hypothesis proposes that...
Life evolved on Earth through natural chemical processes
Life evolved on Earth everywhere at once
Life evolved outside Earth and was deposited here by meteorites
Life evolved on Earth many separate times
2. When does speciation occur?
Two populations have different food sources
One population changes its primary food source
Two populations can no longer mate successfully
3. If a population of birds becomes geographically isolated due to a mountain
range, what is the likely outcome over time in terms of speciation?
The population may undergo speciation due to the lack of gene
flow between the isolated groups.
The population will become extinct due to isolation.
The population will remain unchanged and maintain genetic
uniformity.
The population will merge with another species.
4. If a newly discovered organism lacks one of the five requirements of life,
what implications does this have for its classification as a living entity?
It can still be classified as a living organism based on its genetic
material.
, It can be considered a living organism if it shows signs of
reproduction.
It may not be classified as a living organism if it cannot meet all five
requirements.
It will be classified as a prokaryote regardless of its requirements.
5. What is the definition of chemical evolution?
The process of natural selection acting on genetic variation.
The classification of organisms based on shared characteristics.
The process by which simple organic compounds are transformed
into more complex molecules.
The development of cellular metabolism in prokaryotes.
6. What are the four defining features that characterize prokaryotic cells?
They lack a nucleus, are unicellular, have a cell wall, and have
circular DNA.
They lack a nucleus, are multicellular, have a cell membrane, and have
linear DNA.
They have membrane-bound organelles, are unicellular, have a cell
wall, and have circular DNA.
They have a nucleus, are multicellular, lack a cell wall, and have linear
DNA.
7. Based on the biological species concept, speciation occurs __________
when mutations generate observable differences between two groups
able to interbreed
