WGU C190 Intro to Biology practice test
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Fats and oils are composed of - CORRECT ANSWER - Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has - CORRECT
ANSWER -.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? - CORRECT ANSWER -
Fatty acids and glycerol
What would you have to do to make a fat from the fatty acid shown above? - CORRECT
ANSWER - 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? - CORRECT ANSWER - It is a liquid
oil
What kinds of molecules are the major fuel for the salmon's long trip? - CORRECT
ANSWER - 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. - CORRECT
ANSWER - 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? - CORRECT ANSWER - 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 - CORRECT ANSWER - Contains a hydrophobic and
hydrophilic end
Highly simplified diagram of a membrane's structure is made up of - CORRECT
ANSWER - Phospholipids
Which part of the molecules is hydrophilic? - CORRECT ANSWER - 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? - CORRECT ANSWER - No.
What are molecules? - CORRECT ANSWER - 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? - CORRECT ANSWER - 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? - CORRECT ANSWER - These amino
acids are charged and will attract each other
The amino acid chain of a protein is held together by - CORRECT ANSWER - Covalent
bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds would
it use? - CORRECT ANSWER - Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds would it
use? - CORRECT ANSWER - Hydrogen
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Fats and oils are composed of - CORRECT ANSWER - Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has - CORRECT
ANSWER -.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? - CORRECT ANSWER -
Fatty acids and glycerol
What would you have to do to make a fat from the fatty acid shown above? - CORRECT
ANSWER - 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? - CORRECT ANSWER - It is a liquid
oil
What kinds of molecules are the major fuel for the salmon's long trip? - CORRECT
ANSWER - 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. - CORRECT
ANSWER - 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? - CORRECT ANSWER - 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 - CORRECT ANSWER - Contains a hydrophobic and
hydrophilic end
Highly simplified diagram of a membrane's structure is made up of - CORRECT
ANSWER - Phospholipids
Which part of the molecules is hydrophilic? - CORRECT ANSWER - 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? - CORRECT ANSWER - No.
What are molecules? - CORRECT ANSWER - 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? - CORRECT ANSWER - 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? - CORRECT ANSWER - These amino
acids are charged and will attract each other
The amino acid chain of a protein is held together by - CORRECT ANSWER - Covalent
bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds would
it use? - CORRECT ANSWER - Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds would it
use? - CORRECT ANSWER - Hydrogen
