WGU C190 Biology OA Practice Test 2026 | Questions &
Answers | Pass Exam Prep
1. What is the basic unit of all matter?
Organism
Cell
Molecule
Atom
2. . Biogeochemical cycles describe ____.
all available nutrients in an ecosystem
the constant recycling of nutrients between biotic and abiotic
components of ecosystems
the input of solar energy into a closed ecosystem
pathways by which energy and nutrients move through biotic
components of ecosystems
a series of mathematical equations that define an ecosystem's most
important relationships
3. The diagram below illustrates the process of cell division. What is the
significance of anaphase in this process?
In anaphase, the DNA is being replicated.
Anaphase usually ensures that each daughter cell has twice as many
chromosomes as the parent cell.
In anaphase, the cell splits in half.
, Anaphase usually ensures that each daughter cell has the same
number of chromosomes as the parent cell.
4. Ionic bonds form when:
Hydrogen bonds are present.
Electrons are transferred from one atom to another.
Electrons are part of a polar covalent bond.
Electrons are shared equally between atoms.
5. Describe the process by which decomposers contribute to nutrient cycling in
an ecosystem.
Decomposers consume living organisms, preventing overpopulation.
Decomposers break down dead organic material, releasing
nutrients back into the soil for use by plants.
Decomposers compete with producers for sunlight.
Decomposers produce energy through photosynthesis.
6. What are the two main stages of cell division?
Telophase and anaphase
Interphase and prophase
Meiosis and fertilization
Mitosis and cytokinesis
7. Which of the following is true of DNA structure?
DNA is single-stranded.
DNA forms a double helix.
, In DNA, C binds with T.
DNA is composed of amino acids.
8. If a cell experiences a mutation that impairs protein synthesis during the G1
phase, what potential impact could this have on the cell's ability to progress
through the cell cycle?
The cell will divide normally without any issues.
The cell will enter a prolonged state of dormancy.
The cell will immediately undergo apoptosis.
The cell may not grow properly and could fail to prepare
adequately for DNA replication.
9. What functions can lipids perform?
forming the basis of biological membranes
storing energy
acting as hormones and sending signals throughout the body
making cell membranes more fluid in cold temperatures
all of the above
10. Why are macromolecules also known as "biological polymers"?
Many organisms have macromolecules
There are many types of macromolecules
They are large molecules added together
They are large molecules made up of many monomers
, 11. Describe the role of chlorophyll in the light-dependent reactions of
photosynthesis.
Chlorophyll converts ATP into glucose.
Chlorophyll captures light energy, which is then used to produce
ATP and NADPH.
Chlorophyll releases oxygen as a waste product.
Chlorophyll absorbs carbon dioxide for glucose production.
12. Describe the significance of sister chromatid separation during anaphase in
the context of cell division.
Sister chromatids remain attached to ensure genetic diversity.
Sister chromatid separation ensures that each daughter cell
receives an identical set of chromosomes.
Sister chromatids are destroyed to prevent mutations.
Sister chromatids are duplicated to increase genetic material.
13. What is the primary event that occurs during anaphase in cell division?
Sister chromatids separate and move toward opposite poles of the
cell.
Cytoplasm divides to form two daughter cells.
Chromosomes align at the cell's equatorial plane.
Nuclear envelope begins to reform around the chromosomes.
14. Describe the role of mutualism in interspecific interactions.
Mutualism is when two species do not interact at all.
Answers | Pass Exam Prep
1. What is the basic unit of all matter?
Organism
Cell
Molecule
Atom
2. . Biogeochemical cycles describe ____.
all available nutrients in an ecosystem
the constant recycling of nutrients between biotic and abiotic
components of ecosystems
the input of solar energy into a closed ecosystem
pathways by which energy and nutrients move through biotic
components of ecosystems
a series of mathematical equations that define an ecosystem's most
important relationships
3. The diagram below illustrates the process of cell division. What is the
significance of anaphase in this process?
In anaphase, the DNA is being replicated.
Anaphase usually ensures that each daughter cell has twice as many
chromosomes as the parent cell.
In anaphase, the cell splits in half.
, Anaphase usually ensures that each daughter cell has the same
number of chromosomes as the parent cell.
4. Ionic bonds form when:
Hydrogen bonds are present.
Electrons are transferred from one atom to another.
Electrons are part of a polar covalent bond.
Electrons are shared equally between atoms.
5. Describe the process by which decomposers contribute to nutrient cycling in
an ecosystem.
Decomposers consume living organisms, preventing overpopulation.
Decomposers break down dead organic material, releasing
nutrients back into the soil for use by plants.
Decomposers compete with producers for sunlight.
Decomposers produce energy through photosynthesis.
6. What are the two main stages of cell division?
Telophase and anaphase
Interphase and prophase
Meiosis and fertilization
Mitosis and cytokinesis
7. Which of the following is true of DNA structure?
DNA is single-stranded.
DNA forms a double helix.
, In DNA, C binds with T.
DNA is composed of amino acids.
8. If a cell experiences a mutation that impairs protein synthesis during the G1
phase, what potential impact could this have on the cell's ability to progress
through the cell cycle?
The cell will divide normally without any issues.
The cell will enter a prolonged state of dormancy.
The cell will immediately undergo apoptosis.
The cell may not grow properly and could fail to prepare
adequately for DNA replication.
9. What functions can lipids perform?
forming the basis of biological membranes
storing energy
acting as hormones and sending signals throughout the body
making cell membranes more fluid in cold temperatures
all of the above
10. Why are macromolecules also known as "biological polymers"?
Many organisms have macromolecules
There are many types of macromolecules
They are large molecules added together
They are large molecules made up of many monomers
, 11. Describe the role of chlorophyll in the light-dependent reactions of
photosynthesis.
Chlorophyll converts ATP into glucose.
Chlorophyll captures light energy, which is then used to produce
ATP and NADPH.
Chlorophyll releases oxygen as a waste product.
Chlorophyll absorbs carbon dioxide for glucose production.
12. Describe the significance of sister chromatid separation during anaphase in
the context of cell division.
Sister chromatids remain attached to ensure genetic diversity.
Sister chromatid separation ensures that each daughter cell
receives an identical set of chromosomes.
Sister chromatids are destroyed to prevent mutations.
Sister chromatids are duplicated to increase genetic material.
13. What is the primary event that occurs during anaphase in cell division?
Sister chromatids separate and move toward opposite poles of the
cell.
Cytoplasm divides to form two daughter cells.
Chromosomes align at the cell's equatorial plane.
Nuclear envelope begins to reform around the chromosomes.
14. Describe the role of mutualism in interspecific interactions.
Mutualism is when two species do not interact at all.
