The Principles of Biology Exam Practice Questions
with Certified Solutions
What are the three domains of all life on earth? - Answer 1. Bacteria
-They are single celled, meaning they are prokaryotic cells
-No nucleus
2. Archaea
-Live in extreme conditions and that includes the level of the ocean where sunlight is weak
-They are single celled, meaning they are prokaryotic cells
-No nucleus
3. Eukaryotic
-They have a nucleus, meaning they are multi celled.
-And they are basically the Protista, Plants, Animals, and Fungi
Which domains have only single-celled microbes? - Answer 1. Bacteria
2. Archaea
What don't those cells have that the other domain's cells do? - Answer The prokaryotes don't have
nucleus and other organelles
What are the four kingdoms in Domain Eukarya? - Answer 1. Protista
2. Plantae
3. Animalia
4. Fungi
, Which kingdom gave rise to the other three kingdoms? - Answer Protista-Because organisms in this one
are similar to the other kingdoms. It also has a mix of life forms, unicellular (prokaryotic) and
multicellular (Eukaryotic)
What is science? - Answer Science is a body of knowledge; a collection of unified insights about nature,
the evidence for which is an array of facts.
What is a theory in science? - Answer It is a general set of principles, supported by evidence, that
explains some aspect of nature
-This knowledge is built over years. It can be used as a predictive tool to test hypotheses
Three theories:
1. Atomic theory-The structure of a atom
2. Cell Theory
3. Evolution Theory
What is the atomic theory? - Answer It's the theory that states that atoms are made up of three
particles; the nucleus and the protons ( + charge) at the center orbited by any number of electrons (-
charge)
What is the cell theory? - Answer It's the theory that states that cells are the smallest units of life and
that cells come from other cells
What is the theory of evolution? - Answer It's the theory that states living things gradually modify over
time sometimes resulting in the development of new species
Give the parts of the Scientific method - Answer 1. Observation-Initial questioning of nature
-scientists are skeptics which lead to inquires
2. Hypothesis-Precise statement to test or experiment (you have to be able to test it)
3. Conclusion-If one can be reached it is drawn solely from the test or experiment
Define a hypothesis and give an example - Answer A tentative statement we want to test about nature
-It's a statement that could be true and it has to be testable
with Certified Solutions
What are the three domains of all life on earth? - Answer 1. Bacteria
-They are single celled, meaning they are prokaryotic cells
-No nucleus
2. Archaea
-Live in extreme conditions and that includes the level of the ocean where sunlight is weak
-They are single celled, meaning they are prokaryotic cells
-No nucleus
3. Eukaryotic
-They have a nucleus, meaning they are multi celled.
-And they are basically the Protista, Plants, Animals, and Fungi
Which domains have only single-celled microbes? - Answer 1. Bacteria
2. Archaea
What don't those cells have that the other domain's cells do? - Answer The prokaryotes don't have
nucleus and other organelles
What are the four kingdoms in Domain Eukarya? - Answer 1. Protista
2. Plantae
3. Animalia
4. Fungi
, Which kingdom gave rise to the other three kingdoms? - Answer Protista-Because organisms in this one
are similar to the other kingdoms. It also has a mix of life forms, unicellular (prokaryotic) and
multicellular (Eukaryotic)
What is science? - Answer Science is a body of knowledge; a collection of unified insights about nature,
the evidence for which is an array of facts.
What is a theory in science? - Answer It is a general set of principles, supported by evidence, that
explains some aspect of nature
-This knowledge is built over years. It can be used as a predictive tool to test hypotheses
Three theories:
1. Atomic theory-The structure of a atom
2. Cell Theory
3. Evolution Theory
What is the atomic theory? - Answer It's the theory that states that atoms are made up of three
particles; the nucleus and the protons ( + charge) at the center orbited by any number of electrons (-
charge)
What is the cell theory? - Answer It's the theory that states that cells are the smallest units of life and
that cells come from other cells
What is the theory of evolution? - Answer It's the theory that states living things gradually modify over
time sometimes resulting in the development of new species
Give the parts of the Scientific method - Answer 1. Observation-Initial questioning of nature
-scientists are skeptics which lead to inquires
2. Hypothesis-Precise statement to test or experiment (you have to be able to test it)
3. Conclusion-If one can be reached it is drawn solely from the test or experiment
Define a hypothesis and give an example - Answer A tentative statement we want to test about nature
-It's a statement that could be true and it has to be testable
