WGU C190 Intro To Biology Test Questions and Answers (100% Correct)
Question :Fats and oils are composed of
Correct answer:Fatty acids and glycerol
Question :Fatty acids can naturally be saturated or
unsaturated. A saturated fatty acid has .
Correct answer:All single covalent bonds
Question :Triglycerides, a type of fat, are composed of what
two subunits?
Correct answer:Fatty acids and glycerol
Question :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.
Question :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
Question :What kinds of molecules are the major fuel for the
salmon's long trip?
Correct answer:Triglycerides (fats / oils)
Question :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
Question :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.
Question :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
Question :Highly simplified diagram of a membrane's
structure is made up of
Correct answer:Phospholipids
Question :Which part of the molecules is hydrophilic?
Correct answer:The heads
Question :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.
Question :What are molecules?
Correct answer:Molecules are made of atoms
Question :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.
Question :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
Question :The amino acid chain of a protein is held together
by
Correct answer:Covalent bonds
Question :If the protein is mainly structural and needs to
maintain a stable, rigid form, which bonds would it use?