WGU C190 INTRO TO BIOLOGY PRACTICE TEST
QUESTIONS WITH CORRECT SOLUTIONS
1. Fats and oils are composed of - ANS☑☑---Fatty acids and glycerol
2. Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has -
ANS☑☑---.
All single covalent bonds
3. Triglycerides, a type of fat, are composed of what two subunits? - ANS☑☑---
Fatty acids and glycerol
4. What would you have to do to make a fat from the fatty acid shown above? -
ANS☑☑---Attach it to a glycerol along with two other fatty acids.
5. 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? - ANS☑☑---It
is a liquid oil
6. What kinds of molecules are the major fuel for the salmon's long trip? -
ANS☑☑---Triglycerides (fats / oils)
7. 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. - ANS☑☑---Fatty acids and glycerol
, 8. 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? - ANS☑☑---Oil sheds
water and keeps underlying layers of fur or downy feathers dry.
9. Another type of lipid that composes cells are called phospholipids. Phospholipids
differ from other lipids because they - ANS☑☑---Contains a hydrophobic and
hydrophilic end
10. Highly simplified diagram of a membrane's structure is made up of - ANS☑☑--
-Phospholipids
11. Which part of the molecules is hydrophilic? - ANS☑☑---The heads
12. Ions of salt (sodium, NA+, and chloride, Cl−) are highly hydrophilic. Will they
easily pass through the layer to enter or leave a cell? - ANS☑☑---No.
13. What are molecules? - ANS☑☑---Molecules are made of atoms
14. Below is an image of the smallest amino acid: Glycine. What does each line in the
picture of the amino acid represent? - ANS☑☑---A shared pair of electrons in a
covalent bond.
15. 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? - ANS☑☑---
These amino acids are charged and will attract each other
QUESTIONS WITH CORRECT SOLUTIONS
1. Fats and oils are composed of - ANS☑☑---Fatty acids and glycerol
2. Fatty acids can naturally be saturated or unsaturated. A saturated fatty acid has -
ANS☑☑---.
All single covalent bonds
3. Triglycerides, a type of fat, are composed of what two subunits? - ANS☑☑---
Fatty acids and glycerol
4. What would you have to do to make a fat from the fatty acid shown above? -
ANS☑☑---Attach it to a glycerol along with two other fatty acids.
5. 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? - ANS☑☑---It
is a liquid oil
6. What kinds of molecules are the major fuel for the salmon's long trip? -
ANS☑☑---Triglycerides (fats / oils)
7. 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. - ANS☑☑---Fatty acids and glycerol
, 8. 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? - ANS☑☑---Oil sheds
water and keeps underlying layers of fur or downy feathers dry.
9. Another type of lipid that composes cells are called phospholipids. Phospholipids
differ from other lipids because they - ANS☑☑---Contains a hydrophobic and
hydrophilic end
10. Highly simplified diagram of a membrane's structure is made up of - ANS☑☑--
-Phospholipids
11. Which part of the molecules is hydrophilic? - ANS☑☑---The heads
12. Ions of salt (sodium, NA+, and chloride, Cl−) are highly hydrophilic. Will they
easily pass through the layer to enter or leave a cell? - ANS☑☑---No.
13. What are molecules? - ANS☑☑---Molecules are made of atoms
14. Below is an image of the smallest amino acid: Glycine. What does each line in the
picture of the amino acid represent? - ANS☑☑---A shared pair of electrons in a
covalent bond.
15. 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? - ANS☑☑---
These amino acids are charged and will attract each other
