WGU C190 Intro to Biology practice test
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.
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
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
Water molecules binding to each other is called a - CORRECT ANSWER-Cohesion
Water molecules binding to other molecules is called - CORRECT ANSWER-Adhesion
Water molecules form hydrogen bonds because water is - CORRECT ANSWER-Polar
Water can bind to the walls of these cells because they are - CORRECT ANSWER-
Polar
When water binds to the walls of the cells, this is called an - CORRECT ANSWER-
Adhesion
Water molecules within these cells will also bind to each other. What is this called? -
CORRECT ANSWER-Cohesion
Dissolving sugar in water makes a - CORRECT ANSWER-Solution
The sugar is the - CORRECT ANSWER-Solute
The water is the - CORRECT ANSWER-Sovent
As water moves up the plant, it carries matter with it (such as nutrients and some
hormones). What are these materials called? - CORRECT ANSWER-Solutes
What characteristic of water allows this paperclip to float on the surface of the water? -
CORRECT ANSWER-Surface tension
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.
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
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
Water molecules binding to each other is called a - CORRECT ANSWER-Cohesion
Water molecules binding to other molecules is called - CORRECT ANSWER-Adhesion
Water molecules form hydrogen bonds because water is - CORRECT ANSWER-Polar
Water can bind to the walls of these cells because they are - CORRECT ANSWER-
Polar
When water binds to the walls of the cells, this is called an - CORRECT ANSWER-
Adhesion
Water molecules within these cells will also bind to each other. What is this called? -
CORRECT ANSWER-Cohesion
Dissolving sugar in water makes a - CORRECT ANSWER-Solution
The sugar is the - CORRECT ANSWER-Solute
The water is the - CORRECT ANSWER-Sovent
As water moves up the plant, it carries matter with it (such as nutrients and some
hormones). What are these materials called? - CORRECT ANSWER-Solutes
What characteristic of water allows this paperclip to float on the surface of the water? -
CORRECT ANSWER-Surface tension
