WGU C190 INTRO TO BIOLOGY
PRACTICE TEST QUESTIONS AND
ANSWERS
Fats and oils are composed of - Correct Answers -Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has -
Correct Answers -.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? - Correct Answers -
Fatty acids and glycerol
What would you have to do to make a fat from the fatty acid shown above? - Correct
Answers -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 Answers -It is a liquid
oil
What kinds of molecules are the major fuel for the salmon's long trip? - Correct Answers
-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 Answers -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 Answers -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 Answers -Contains a hydrophobic and
hydrophilic end
This molecule translates the genetic code into proteins by telling the cell the sequence
of amino acids to produce the peptide (protein). - Correct Answers -RNA
, This molecule contains the "recipe" or instructions for the making of proteins. - Correct
Answers -DNA
Look at the five in the red circles in the picture above. They are representing the carbon
atoms on what part of the nucleotide? - Correct Answers -Pentose sugar
Highly simplified diagram of a membrane's structure is made up of - Correct Answers -
Phospholipids
Which part of the molecules is hydrophilic? - Correct Answers -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 Answers -No.
What are molecules? - Correct Answers -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 Answers -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 Answers -These
amino acids are charged and will attract each other
The amino acid chain of a protein is held together by - Correct Answers -Covalent
bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds
would it use? - Correct Answers -Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds
would it use? - Correct Answers -Hydrogen
Water molecules binding to each other is called a - Correct Answers -Cohesion
Water molecules binding to other molecules is called - Correct Answers -Adhesion
Water molecules form hydrogen bonds because water is - Correct Answers -Polar
Water can bind to the walls of these cells because they are - Correct Answers -Polar
When water binds to the walls of the cells, this is called an - Correct Answers -Adhesion
Water molecules within these cells will also bind to each other. What is this called? -
Correct Answers -Cohesion
PRACTICE TEST QUESTIONS AND
ANSWERS
Fats and oils are composed of - Correct Answers -Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has -
Correct Answers -.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? - Correct Answers -
Fatty acids and glycerol
What would you have to do to make a fat from the fatty acid shown above? - Correct
Answers -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 Answers -It is a liquid
oil
What kinds of molecules are the major fuel for the salmon's long trip? - Correct Answers
-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 Answers -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 Answers -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 Answers -Contains a hydrophobic and
hydrophilic end
This molecule translates the genetic code into proteins by telling the cell the sequence
of amino acids to produce the peptide (protein). - Correct Answers -RNA
, This molecule contains the "recipe" or instructions for the making of proteins. - Correct
Answers -DNA
Look at the five in the red circles in the picture above. They are representing the carbon
atoms on what part of the nucleotide? - Correct Answers -Pentose sugar
Highly simplified diagram of a membrane's structure is made up of - Correct Answers -
Phospholipids
Which part of the molecules is hydrophilic? - Correct Answers -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 Answers -No.
What are molecules? - Correct Answers -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 Answers -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 Answers -These
amino acids are charged and will attract each other
The amino acid chain of a protein is held together by - Correct Answers -Covalent
bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds
would it use? - Correct Answers -Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds
would it use? - Correct Answers -Hydrogen
Water molecules binding to each other is called a - Correct Answers -Cohesion
Water molecules binding to other molecules is called - Correct Answers -Adhesion
Water molecules form hydrogen bonds because water is - Correct Answers -Polar
Water can bind to the walls of these cells because they are - Correct Answers -Polar
When water binds to the walls of the cells, this is called an - Correct Answers -Adhesion
Water molecules within these cells will also bind to each other. What is this called? -
Correct Answers -Cohesion
