WGU C190 INTRO TO BIOLOGY PRACTICE TEST
QUESTIONS & ANSWERS
Fats and oils are composed of - Answer -Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has -
Answer -.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? - Answer -Fatty acids
and glycerol
What would you have to do to make a fat from the fatty acid shown above? - 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? - Answer -It is a liquid oil
What kinds of molecules are the major fuel for the salmon's long trip? - 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. - 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? - 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 - Answer -Contains a hydrophobic and hydrophilic end
Highly simplified diagram of a membrane's structure is made up of - Answer -
Phospholipids
Which part of the molecules is hydrophilic? - 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? - Answer -No.
What are molecules? - 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? - 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? - Answer -These amino
acids are charged and will attract each other
The amino acid chain of a protein is held together by - Answer -Covalent bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds
would it use? - Answer -Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds
would it use? - Answer -Hydrogen
Water molecules binding to each other is called a - Answer -Cohesion
Water molecules binding to other molecules is called - Answer -Adhesion
Water molecules form hydrogen bonds because water is - Answer -Polar
Water can bind to the walls of these cells because they are - Answer -Polar
When water binds to the walls of the cells, this is called an - Answer -Adhesion
Water molecules within these cells will also bind to each other. What is this called? -
Answer -Cohesion
Dissolving sugar in water makes a - Answer -Solution
The sugar is the - Answer -Solute
The water is the - Answer -Sovent
As water moves up the plant, it carries matter with it (such as nutrients and some
hormones). What are these materials called? - Answer -Solutes
What characteristic of water allows this paperclip to float on the surface of the water? -
Answer -Surface tension
Why does mercury (Hg) not travel as far up the capillary tube as water does? - Answer
-Mercury is not as adhesive as water
If the plant gets too dry, the water column can break. This creates an air bubble in the
xylem.
QUESTIONS & ANSWERS
Fats and oils are composed of - Answer -Fatty acids and glycerol
Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has -
Answer -.
All single covalent bonds
Triglycerides, a type of fat, are composed of what two subunits? - Answer -Fatty acids
and glycerol
What would you have to do to make a fat from the fatty acid shown above? - 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? - Answer -It is a liquid oil
What kinds of molecules are the major fuel for the salmon's long trip? - 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. - 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? - 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 - Answer -Contains a hydrophobic and hydrophilic end
Highly simplified diagram of a membrane's structure is made up of - Answer -
Phospholipids
Which part of the molecules is hydrophilic? - 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? - Answer -No.
What are molecules? - 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? - 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? - Answer -These amino
acids are charged and will attract each other
The amino acid chain of a protein is held together by - Answer -Covalent bonds
If the protein is mainly structural and needs to maintain a stable, rigid form, which bonds
would it use? - Answer -Covalent bonds
If the protein needs to be flexible, with bonds that easily break and reform, which bonds
would it use? - Answer -Hydrogen
Water molecules binding to each other is called a - Answer -Cohesion
Water molecules binding to other molecules is called - Answer -Adhesion
Water molecules form hydrogen bonds because water is - Answer -Polar
Water can bind to the walls of these cells because they are - Answer -Polar
When water binds to the walls of the cells, this is called an - Answer -Adhesion
Water molecules within these cells will also bind to each other. What is this called? -
Answer -Cohesion
Dissolving sugar in water makes a - Answer -Solution
The sugar is the - Answer -Solute
The water is the - Answer -Sovent
As water moves up the plant, it carries matter with it (such as nutrients and some
hormones). What are these materials called? - Answer -Solutes
What characteristic of water allows this paperclip to float on the surface of the water? -
Answer -Surface tension
Why does mercury (Hg) not travel as far up the capillary tube as water does? - Answer
-Mercury is not as adhesive as water
If the plant gets too dry, the water column can break. This creates an air bubble in the
xylem.
