WGU C190 Introduction to Biology Questions & Answers
2026 | Latest Review Guide
1. A fourth-grade teacher helps students in her class build the terrarium shown
in the diagram below.
This activity would be most effective for helping students in the class
understand which of the following science concepts?
role of decomposition in nutrient cycling through an ecosystem
transfer of energy across trophic levels in an ecosystem
processes contributing to the cycling of water through an ecosystem
factors that influence biological diversity in an ecosystem
2. Microevolution occurs in:
communities
individuals
inbred species
populations
3. Adenosine Triphosphate is an important molecule that:
Contains guanine
Is an example of nucleotides
Catalyzes the addition of phosphate groups to substrates
Acts as intracellular storage of free energy
4. Describe the relationship between soil pH and the flower color of
hydrangeas.
, Flower color is determined solely by genetic factors in hydrangeas.
Hydrangeas change color based on the amount of sunlight they
receive.
The pH of the soil affects the availability of aluminum ions, which
influence the flower color of hydrangeas.
Soil pH has no effect on flower color in hydrangeas.
5. Describe how a molecule formed from glucose monomers contributes to
cellular functions.
It encodes genetic information for protein synthesis.
It facilitates the transport of oxygen in the bloodstream.
It serves as a storage form of energy that can be readily mobilized
when needed.
It acts as a structural component of the cell membrane.
6. The information carried by DNA is used to create a ________ which then moves
to the ribosome for protein synthesis.
tRNA
rRNA
siRNA
mRNA
7. An atom is:
A group of two or more atoms held together by covalent bonds
Two elements bonded together
, A single particle of an element (positive nucleus, negative
electrons)
8. Describe how meiosis and mitosis are similar in terms of their role in the cell
cycle.
Both meiosis and mitosis are processes of cell division that
contribute to the reproduction and growth of organisms.
Both processes lead to the formation of gametes.
Both processes only occur in multicellular organisms.
Both processes are identical in their outcomes.
9. You placed a full bottle of water in the freezer. The next day, you found that
the bottle had expanded so much that the top cracked off. Why did this
happen?
Water maximizes its number of hydrogen bonds as it freezes,
creating an open lattice-like formation that is less dense than liquid
water
Decreased temperatures increase the electronegativity of oxygen,
resulting in highly polarized molecules that repel each other
As water freezes, bonds between oxygen and hydrogen break,
allowing atoms to move further apart, causing ice to expand
As the temperature decreases, water molecules move more rapidly,
expanding against the edges of the structure in which they are
contained
Water maximizes its number of hydrogen bonds as it freezes, so
molecules move further apart causing ice to expand
, 10. What metabolic process do fast twitch muscle fibers primarily use during
short bursts of intense exercise?
Photosynthesis
Anaerobic respiration
Aerobic respiration
Fermentation
11. What type of RNA is responsible for conveying genetic information from
DNA to the ribosome for protein synthesis?
Transfer RNA
DNA
Messenger RNA
Ribosomal RNA
12. What is the term for a biological polymer made up of amino acids?
Nucleic acid
Protein
Carbohydrate
Lipid
13. If the population of Arctic bumblebees were to decline significantly, what
impact might this have on the Arctic poppy population?
The Arctic poppy will adapt to self-pollinate more effectively.
The Arctic poppy population may decrease due to reduced
pollination.
2026 | Latest Review Guide
1. A fourth-grade teacher helps students in her class build the terrarium shown
in the diagram below.
This activity would be most effective for helping students in the class
understand which of the following science concepts?
role of decomposition in nutrient cycling through an ecosystem
transfer of energy across trophic levels in an ecosystem
processes contributing to the cycling of water through an ecosystem
factors that influence biological diversity in an ecosystem
2. Microevolution occurs in:
communities
individuals
inbred species
populations
3. Adenosine Triphosphate is an important molecule that:
Contains guanine
Is an example of nucleotides
Catalyzes the addition of phosphate groups to substrates
Acts as intracellular storage of free energy
4. Describe the relationship between soil pH and the flower color of
hydrangeas.
, Flower color is determined solely by genetic factors in hydrangeas.
Hydrangeas change color based on the amount of sunlight they
receive.
The pH of the soil affects the availability of aluminum ions, which
influence the flower color of hydrangeas.
Soil pH has no effect on flower color in hydrangeas.
5. Describe how a molecule formed from glucose monomers contributes to
cellular functions.
It encodes genetic information for protein synthesis.
It facilitates the transport of oxygen in the bloodstream.
It serves as a storage form of energy that can be readily mobilized
when needed.
It acts as a structural component of the cell membrane.
6. The information carried by DNA is used to create a ________ which then moves
to the ribosome for protein synthesis.
tRNA
rRNA
siRNA
mRNA
7. An atom is:
A group of two or more atoms held together by covalent bonds
Two elements bonded together
, A single particle of an element (positive nucleus, negative
electrons)
8. Describe how meiosis and mitosis are similar in terms of their role in the cell
cycle.
Both meiosis and mitosis are processes of cell division that
contribute to the reproduction and growth of organisms.
Both processes lead to the formation of gametes.
Both processes only occur in multicellular organisms.
Both processes are identical in their outcomes.
9. You placed a full bottle of water in the freezer. The next day, you found that
the bottle had expanded so much that the top cracked off. Why did this
happen?
Water maximizes its number of hydrogen bonds as it freezes,
creating an open lattice-like formation that is less dense than liquid
water
Decreased temperatures increase the electronegativity of oxygen,
resulting in highly polarized molecules that repel each other
As water freezes, bonds between oxygen and hydrogen break,
allowing atoms to move further apart, causing ice to expand
As the temperature decreases, water molecules move more rapidly,
expanding against the edges of the structure in which they are
contained
Water maximizes its number of hydrogen bonds as it freezes, so
molecules move further apart causing ice to expand
, 10. What metabolic process do fast twitch muscle fibers primarily use during
short bursts of intense exercise?
Photosynthesis
Anaerobic respiration
Aerobic respiration
Fermentation
11. What type of RNA is responsible for conveying genetic information from
DNA to the ribosome for protein synthesis?
Transfer RNA
DNA
Messenger RNA
Ribosomal RNA
12. What is the term for a biological polymer made up of amino acids?
Nucleic acid
Protein
Carbohydrate
Lipid
13. If the population of Arctic bumblebees were to decline significantly, what
impact might this have on the Arctic poppy population?
The Arctic poppy will adapt to self-pollinate more effectively.
The Arctic poppy population may decrease due to reduced
pollination.
