WEEK 7
Lipids
1. Which of the following is a source of lipids?
a. Water
b. Sugar, fruits, and bread
c. Butter and oils
d. Steaks
Water is the by-product of condensation reactions.
Answer the following questions below about lipids.
Question
Triglycerides are:
a. used for catalysis in the body.
b. made of fatty acid monomers.
c. soluble in water.
d. always unsaturated.
Question
Select all that apply. Saturated fatty acids contain functional groups.
a. amine
b. alkanes
c. alkenes
d. carboxylic acid
e. halogen
Question
From the condensed structural formula, determine if the structure represents a saturated fatty
acid, a monounsaturated fatty acid, or a polyunsaturated fatty acid.
MONOUNSATU POLYUNSATUR
SATURATED
RATED FATTY ATED FATTY
FATTY
ACID ACID
ACID
CH3CH2CHCHCH2
yes
COOH
CH3CHCHCH2CH2
yes
COOH
CH3CHCHCH2CH
yes
CHCH2COOH
CH3CH2CH2CH2CH
yes
2COOH
Question 1 Feedback
,Triglycerides are made of fatty acid monomers.
Question 2 Feedback
Saturated fatty acids will contain all single bonds, thus contain alkanes, and will contain a
carboxylic acid functional group on one end.
Question 3 Feedback
Alkanes are saturated fatty acids and are represented by CH3 on the end carbon and CH2 for
each middle carbon. Monounsaturated fatty acids will contain a single double bond, represented
by CHCH in the condensed structural formula; polyunsaturated fatty acids will contain two or
more double bonds in the condensed structural formula.
2. Select the correct property for the category of fatty acids that it
describes. Contains carboxylic acid =
Saturated, Unsaturated, Both Saturated and Unsaturated
Contains a single double carbon-to-carbon bond =
Saturated, Unsaturated, Both Saturated and Unsaturated
Contains multiple double carbon-to-carbon bonds =
Saturated, Unsaturated, Both Saturated and Unsaturated
Solid at room temperature =
Saturated, Unsaturated, Both Saturated and Unsaturated
Contains no carbon-to-carbon double bonds =
Saturated, Unsaturated, Both Saturated and Unsaturated
Liquid at room temp =
Saturated, Unsaturated, Both Saturated and Unsaturated
Does not mix with water =
Saturated, Unsaturated, Both Saturated and Unsaturated
Both saturated and unsaturated do not mix with water.
Saturated contains no double carbon-to-carbon bonds and is solid at room temperature.
Unsaturated contains a single double carbon-to-carbon bond (monounsaturated) or multiple
double carbon-to-carbon bonds (polyunsaturated) and are mostly liquid at room temperature.
4. Using the molecule below, answer the following questions.
, Question
Tis molecule is best described as
a. a fatty acid.
b. a triglyceride.
c. a polyunsaturated fatty acid.
d. an unsaturated fatty acid.
This image is a lipid, not a fatty acid. It is made from three fatty acids combined with a molecule of
glycerol, and is called a triglyceride or triacylglycerol.
Question
How many fatty acids were used to create this triacylglycerol molecule?
a. One
b. Two
c. Three
d. Four
Triacylglycerols are made from three fatty acids attached to one glycerol.
Question
, The fatty acids used to create this triacylglycerol are
a. all identical.
b. all unsaturated.
c. all saturated.
d. all connected through an ester linkage.
All three fatty acids are connected to the glycerol through ester linkages. They are all different,
some being saturated and some unsaturated.
5. Click and drag the name of the lipid to match the function
Comprises the majority of cell membranes because it contains a polar head and a nonpolar tail. ---
glycerophospholipids
Used in soap making. --- triacylglycerol
Structure includes three six-member rings fused with a five-member ring, and in cell membranes provides
stability and is a precursor for vitamin D. --- cholesterol
cholesterol
glycerophospholipids
Triacylglycerol
Glycerophospholipids comprise the majority of cells due to their polar head and nonpolar tails,
allowing them to create a stable bi-layer structure.
Triacylglycerols are commonly used in soap making when combined with sodium hydroxide (lye).
The fused ring structure is cholesterol, one type of steroid.
6. Select all that apply. Which of the following are typically solids at room temperature?
a. Polyunsaturated lipids
b. Trans lipids
c. Monounsaturated lipids
d. Saturated lipids
e. Unsaturated lipids
Both saturated fats and trans fats are solids at room temperature due to their linear structures.
7. Which class of lipids is found in cell membranes?
a. Sterols
b. Triacylglycerol
c. Glycerolphospholipid
d. Steroids and Triacylglycerol
e. Steroids and Glycerolphospholipid
Glycerophospholipids make up the majority of the cell membrane, and sterols such as cholesterol
are also found in the membrane and used for stability.
8. What type of linkage is found in triacylglycerols?
Lipids
1. Which of the following is a source of lipids?
a. Water
b. Sugar, fruits, and bread
c. Butter and oils
d. Steaks
Water is the by-product of condensation reactions.
Answer the following questions below about lipids.
Question
Triglycerides are:
a. used for catalysis in the body.
b. made of fatty acid monomers.
c. soluble in water.
d. always unsaturated.
Question
Select all that apply. Saturated fatty acids contain functional groups.
a. amine
b. alkanes
c. alkenes
d. carboxylic acid
e. halogen
Question
From the condensed structural formula, determine if the structure represents a saturated fatty
acid, a monounsaturated fatty acid, or a polyunsaturated fatty acid.
MONOUNSATU POLYUNSATUR
SATURATED
RATED FATTY ATED FATTY
FATTY
ACID ACID
ACID
CH3CH2CHCHCH2
yes
COOH
CH3CHCHCH2CH2
yes
COOH
CH3CHCHCH2CH
yes
CHCH2COOH
CH3CH2CH2CH2CH
yes
2COOH
Question 1 Feedback
,Triglycerides are made of fatty acid monomers.
Question 2 Feedback
Saturated fatty acids will contain all single bonds, thus contain alkanes, and will contain a
carboxylic acid functional group on one end.
Question 3 Feedback
Alkanes are saturated fatty acids and are represented by CH3 on the end carbon and CH2 for
each middle carbon. Monounsaturated fatty acids will contain a single double bond, represented
by CHCH in the condensed structural formula; polyunsaturated fatty acids will contain two or
more double bonds in the condensed structural formula.
2. Select the correct property for the category of fatty acids that it
describes. Contains carboxylic acid =
Saturated, Unsaturated, Both Saturated and Unsaturated
Contains a single double carbon-to-carbon bond =
Saturated, Unsaturated, Both Saturated and Unsaturated
Contains multiple double carbon-to-carbon bonds =
Saturated, Unsaturated, Both Saturated and Unsaturated
Solid at room temperature =
Saturated, Unsaturated, Both Saturated and Unsaturated
Contains no carbon-to-carbon double bonds =
Saturated, Unsaturated, Both Saturated and Unsaturated
Liquid at room temp =
Saturated, Unsaturated, Both Saturated and Unsaturated
Does not mix with water =
Saturated, Unsaturated, Both Saturated and Unsaturated
Both saturated and unsaturated do not mix with water.
Saturated contains no double carbon-to-carbon bonds and is solid at room temperature.
Unsaturated contains a single double carbon-to-carbon bond (monounsaturated) or multiple
double carbon-to-carbon bonds (polyunsaturated) and are mostly liquid at room temperature.
4. Using the molecule below, answer the following questions.
, Question
Tis molecule is best described as
a. a fatty acid.
b. a triglyceride.
c. a polyunsaturated fatty acid.
d. an unsaturated fatty acid.
This image is a lipid, not a fatty acid. It is made from three fatty acids combined with a molecule of
glycerol, and is called a triglyceride or triacylglycerol.
Question
How many fatty acids were used to create this triacylglycerol molecule?
a. One
b. Two
c. Three
d. Four
Triacylglycerols are made from three fatty acids attached to one glycerol.
Question
, The fatty acids used to create this triacylglycerol are
a. all identical.
b. all unsaturated.
c. all saturated.
d. all connected through an ester linkage.
All three fatty acids are connected to the glycerol through ester linkages. They are all different,
some being saturated and some unsaturated.
5. Click and drag the name of the lipid to match the function
Comprises the majority of cell membranes because it contains a polar head and a nonpolar tail. ---
glycerophospholipids
Used in soap making. --- triacylglycerol
Structure includes three six-member rings fused with a five-member ring, and in cell membranes provides
stability and is a precursor for vitamin D. --- cholesterol
cholesterol
glycerophospholipids
Triacylglycerol
Glycerophospholipids comprise the majority of cells due to their polar head and nonpolar tails,
allowing them to create a stable bi-layer structure.
Triacylglycerols are commonly used in soap making when combined with sodium hydroxide (lye).
The fused ring structure is cholesterol, one type of steroid.
6. Select all that apply. Which of the following are typically solids at room temperature?
a. Polyunsaturated lipids
b. Trans lipids
c. Monounsaturated lipids
d. Saturated lipids
e. Unsaturated lipids
Both saturated fats and trans fats are solids at room temperature due to their linear structures.
7. Which class of lipids is found in cell membranes?
a. Sterols
b. Triacylglycerol
c. Glycerolphospholipid
d. Steroids and Triacylglycerol
e. Steroids and Glycerolphospholipid
Glycerophospholipids make up the majority of the cell membrane, and sterols such as cholesterol
are also found in the membrane and used for stability.
8. What type of linkage is found in triacylglycerols?
