WGU C190 INTRO TO BIOLOGY FINAL EXAM 2025|2026 ACTUAL EXAM COMPLETE QUESTIONS WITH DETAILED VERIFIED ANSWERS (100%
CORRECT
Fats and oils are composed of ✔️Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has ✔️.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? ✔️Fatty acids and glycerol
What would you have to do to make a fat from the fatty acid shown above? ✔️Attach it to a glycerol along with two other fatty acids.
If one or more of the fatty acids in a triglyceride include omega-3 fatty acids, what can you predict about this substance at room temperature?
✔️It is a liquid oil
What kinds of molecules are the major fuel for the salmon's long trip? ✔️Triglycerides (fats / oils)
Based on your knowledge of the structure of triglycerides, what products would you expect to result from the complete hydrolysis of a fat
molecule? More than one is correct. ✔️Fatty acids and glycerol
The blubber layer helps insulate mammals and birds that live in cold water; fat does not conduct heat very quickly. Applying what you know
about lipids, what is the main advantage of covering feathers or fur in oil? ✔️Oil sheds water and keeps underlying layers of fur or downy
feathers dry.
Another type of lipid that composes cells are called phospholipids. Phospholipids differ from other lipids because they ✔️Contains a
hydrophobic and hydrophilic end
Highly simplified diagram of a membrane's structure is made up of ✔️Phospholipids
Which part of the molecules is hydrophilic? ✔️The heads
Ions of salt (sodium, NA+, and chloride, Cl−) are highly hydrophilic. Will they easily pass through the layer to enter or leave a cell? ✔️No.
What are molecules? ✔️Molecules are made of atoms
Below is an image of the smallest amino acid: Glycine. What does each line in the picture of the amino acid represent? ✔️A shared pair of
electrons in a covalent bond.
A peptide is built so that the red amino acid is glutamic acid and the blue amino acid is lysine. How will these amino acids respond to each
other? ✔️These amino acids are charged and will attract each other
The amino acid chain of a protein is held together by ✔️Covalent bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds would it use? ✔️Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds would it use? ✔️Hydrogen
Water molecules binding to each other is called a ✔️Cohesion
Water molecules binding to other molecules is called ✔️Adhesion
Water molecules form hydrogen bonds because water is ✔️Polar
Water can bind to the walls of these cells because they are ✔️Polar
When water binds to the walls of the cells, this is called an ✔️Adhesion
Water molecules within these cells will also bind to each other. What is this called? ✔️Cohesion
Dissolving sugar in water makes a ✔️Solution
The sugar is the ✔️Solute
CORRECT
Fats and oils are composed of ✔️Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has ✔️.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? ✔️Fatty acids and glycerol
What would you have to do to make a fat from the fatty acid shown above? ✔️Attach it to a glycerol along with two other fatty acids.
If one or more of the fatty acids in a triglyceride include omega-3 fatty acids, what can you predict about this substance at room temperature?
✔️It is a liquid oil
What kinds of molecules are the major fuel for the salmon's long trip? ✔️Triglycerides (fats / oils)
Based on your knowledge of the structure of triglycerides, what products would you expect to result from the complete hydrolysis of a fat
molecule? More than one is correct. ✔️Fatty acids and glycerol
The blubber layer helps insulate mammals and birds that live in cold water; fat does not conduct heat very quickly. Applying what you know
about lipids, what is the main advantage of covering feathers or fur in oil? ✔️Oil sheds water and keeps underlying layers of fur or downy
feathers dry.
Another type of lipid that composes cells are called phospholipids. Phospholipids differ from other lipids because they ✔️Contains a
hydrophobic and hydrophilic end
Highly simplified diagram of a membrane's structure is made up of ✔️Phospholipids
Which part of the molecules is hydrophilic? ✔️The heads
Ions of salt (sodium, NA+, and chloride, Cl−) are highly hydrophilic. Will they easily pass through the layer to enter or leave a cell? ✔️No.
What are molecules? ✔️Molecules are made of atoms
Below is an image of the smallest amino acid: Glycine. What does each line in the picture of the amino acid represent? ✔️A shared pair of
electrons in a covalent bond.
A peptide is built so that the red amino acid is glutamic acid and the blue amino acid is lysine. How will these amino acids respond to each
other? ✔️These amino acids are charged and will attract each other
The amino acid chain of a protein is held together by ✔️Covalent bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds would it use? ✔️Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds would it use? ✔️Hydrogen
Water molecules binding to each other is called a ✔️Cohesion
Water molecules binding to other molecules is called ✔️Adhesion
Water molecules form hydrogen bonds because water is ✔️Polar
Water can bind to the walls of these cells because they are ✔️Polar
When water binds to the walls of the cells, this is called an ✔️Adhesion
Water molecules within these cells will also bind to each other. What is this called? ✔️Cohesion
Dissolving sugar in water makes a ✔️Solution
The sugar is the ✔️Solute
