Lipids

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1
Lipids are substances that are insoluble in water and can be extracted from cells only by
organic solvents
2
The most abundant type of lipids included in the group that also contains steroids and terpenes
fats
3
General term for lipids that are synthesized from isoprene units
terpenes
4
Carboxylic esters derived from glycerol that are also known as glycerides
fats
5
Class of natural or synthetic organic compounds characterized by a molecular structure of 17-carbon atoms arranged in four rings
steroids
6
Percentage of fat found in food comprised by triglycerides
98%
7
Components that make up a triglyceride
fatty acid and glycerol
8
Long carbon chains joined by single (saturated) or double bonds (unsaturated) and a terminal carboxyl group
fatty acids
9
Composition of the remaining 2% of fat in food
cholesterol, phospholipids, diglycerides, fat-soluble vitamins, steroids, and terpenes
10
In cholesterol, what ring does the double bond located?

Where does the 1st double bond located

Where does double bond located for methyl groups?
Ring B

5th carbon

c10 and c13
11
this is the most insoluble compounds and also called neutral fats
TAGs
12
Describe all the characteristics of Major Alipoproteins based on their location and functions:

A1
A2
A4
B48
Check on the notes
13
Major lipoprotein locations for Apolipoprotein C1
Chylomicrons, VLDL
14
Primary function of Apolipoprotein C1
Activates LCAT
15
Major lipoprotein locations for Apolipoprotein C2
Chylomicrons, VLDL
16
Primary function of Apolipoprotein C2
Activates LPL
17
Major lipoprotein locations for Apolipoprotein C3
Chylomicrons, VLDL, HDL
18
Primary function of Apolipoprotein C3
Regulates clearance of TAG-rich lipoprotein remnants
19
Major lipoprotein locations for Apo D (Apo A-III), also called thin line apoprotein
HDL
20
Primary function of Apo D (Apo A-III)
Activates LCAT
21
Major lipoprotein locations for Apolipoprotein E
VLDL, CM, HDL
22
Primary function of Apolipoprotein E
Recognition factor that targets CM and VLDL remnants to hepatic receptors
23
Common remnants of TAG-rich lipoproteins
IDL and beta-VLDL
24
Apolipoprotein associated with LDL
Apo B-100
25
Apolipoprotein associated with VLDL
B-100
26
Classification of fatty acids containing 4-6 carbon atoms
Short chained fatty acids
27
Classification of fatty acids containing 8-12 carbon atoms
Medium chained fatty acids
28
Classification of fatty acids containing more than 12 carbon atoms
Long chained fatty acids
29
Terminology for fatty acids with no C=C bonds
Saturated fatty acids
30
Terminology for fatty acids containing one C=C bond
Monounsaturated fatty acids
31
Terminology for fatty acids containing more than one C=C bond
Polyunsaturated fatty acids (PUFA)
32
Lipoprotein with the highest protein content
HDL
33
Lipoprotein with the highest cholesterol content
LDL
34
Lipoprotein with the highest TAG content
Chylomicrons
35
Lipoprotein with the highest phospholipid content
HDL
36
Identify the newly secreted HDL that is more active in removing cholesterol from cells
Discoid
37
Identify the HDL formed when discoid HDL acquires cholesterol from cells and transforms into a spherical shape
Spherical
38
List of minor lipoproteins based on the provided selection
Lp(a) and IDL
39
Characteristic of Lp(a) related to heart health
atherogenic
40
Reference substance that Lp(a) is structurally similar to
plasminogen-like
41
Major lipoproteins listed in the handwritten notes
HDL, LDL, VLDL, CM
42
Method for one-step cholesterol determination using colorimetry
Pearson, Stern and Mac Gavack
43
Method for two-step cholesterol determination involving color and extraction
Bloor’s
44
Method for three-step cholesterol determination involving color, extraction, and saponification
Abell-Kendall
45
Method for four-step cholesterol determination involving color, extraction, saponification, and precipitation
Schoenheimer Sperry, Parekh and Jung
46
Condition characterized by an increase in Fe^{3+} (Ferric) and iron storage markers
Hemochromatosis
47
Monosaccharides are the basic building blocks for this macronutrient group
Carbs
48
Amino acids are the building blocks of this nutrient class
Proteins
49
Basic structural components that make up Lipids
fatty acids
50
Five-carbon units that serve as the building blocks for Terpenes
isoprene units
51
Specific chemical bond that links fatty acids to a glycerol backbone
Ester bond
52
Clinical term for fats, such as saturated fats, that promote the formation of arterial plaques
atherogenic
53
Examples of healthy unsaturated fats including MUFA and PUFA
Monounsaturated and Polyunsaturated fatty acids
54
Common source of beneficial Omega-3 fatty acids mentioned in the notes
mackerel or tuna belly
55
Chemical process used to convert liquid oils into solid trans fats
hydrogenation
56
Ranking of lipoproteins from highest to lowest protein content
HDL > LDL > VLDL > CM
57
Ranking of lipoproteins from highest to lowest cholesterol content
LDL > VLDL > HDL > CM
58
Ranking of lipoproteins from highest to lowest TAG (Triglyceride) content
CM > VLDL > LDL > HDL
59
Ranking of lipoproteins from highest to lowest phospholipid content
HDL > LDL > VLDL > CM
60
Lipoprotein that is the least dense and creates a creamy top layer in plasma
Chylomicrons (CM)
61
Appearance of plasma when VLDL levels are significantly elevated
turbid (milky/cloudy)
62
Appearance of plasma when only LDL levels are elevated
clear
63
Shape and status of Nascent HDL newly released from the liver
discoid / flat shape
64
Status and shape of HDL after it acquires cholesterol from cells
Spherical / mature form
65
Direction of the Reverse Cholesterol Pathway
Peripheral cholesterol to Liver
66
Direction of the Forward Cholesterol Pathway mediated by LDL and VLDL
Liver to Peripheral tissues
67
List the quantitative values for Positive Risk Factors (+RF) for HDL, LDL, and TAG
HDL < 40 mg/dL; LDL > 160 mg/dL; TAG > 150 mg/dL
68
Specific HDL level considered to be cardioprotective
HDL > 60 mg/dL
69
Conversion factor used to change TAG from mg/dL to mmol/L
\times 0.0113
70
Divisor used for TAG in the DeLong formula for calculating LDL
6.5
71
Divisor used for TAG in the Friedewald formula for calculating LDL in mg/dL
5
72
Color produced by the Liebermann-Burchard chemical method for cholesterol
green
73
Color produced by the Salkowski chemical method for cholesterol
red
74
Steps involved in the Abell-Kendall 3-step reference method
Color, Extraction and Saponification
75
Names associated with the 4-step reference method for cholesterol
Schoenheimer-Sperry, Parekh, and Jung
76
Identify the clinical condition that becomes significantly more likely when an individual presents with positive (+) lipid risk factors.
cardiac arrest
77
Specify the threshold concentration value for HDL cholesterol that constitutes a positive risk factor for cardiac disease.
< 40 mg/dL
78
Specify the threshold concentration value for LDL cholesterol that constitutes a positive risk factor for cardiac disease.
> 100 mg/dL
79
Specify the first threshold concentration value for triglycerides (TAG) that acts as a positive risk factor for cardiac disease.
> 130 mg/dL
80
Identify the clinical heart condition that an individual is considered protected or free from when they possess negative (-) risk factors.
Myocardial Infarction
81
Specify the target concentration value for HDL cholesterol required to achieve a negative risk factor status.
>= 60 mg/dL
82
Specify the target concentration value for LDL cholesterol required to achieve a negative risk factor status.
< 100 mg/dL
83
Specify the threshold concentration value for total cholesterol that acts as a positive risk factor.
> 200 mg/dL
84
Specify the second threshold concentration value for triglycerides (TAG) that acts as a positive risk factor.
> 150 mg/dL
85
Identify the specific lipid parameter and its value that is explicitly designated as cardioprotective.
HDL >= 60 mg/dL
86
Identify the traditional cholesterol colorimetric chemical reaction that yields a characteristic green color.
Liebermann-Burchard
87
Identify the traditional cholesterol colorimetric chemical reaction that yields a characteristic red color.
Salkowski
88
List the three specific analytical procedures that comprise the 3 step method for lipid determination.
color + extract + saponification
89
Name the specific 3 step reference method used for cholesterol extraction and lipid determination.
Abell-Kendall
90
List the four designated multi-step methods or investigators associated with the 4 step method for lipid determination.
Schoenheimer, Sperry, Parekh, Jung
91
CH3-CH2-... + H2 (saturated)
Hydrogenation
92
CH3-CH2-... (unsaturated) -> Hydrogenation ->
CH3-CH2-... (saturated)
93
The process that converts unsaturated fatty acids into saturated fatty acids by adding hydrogen atoms is called
Hydrogenation
94
Identify the missing compound in the reaction pathway: Safflower + 2H -> Stearic Acid -> Stearic Acid ->
Oleic Acid
95
Name the type of isomerism formed during the partial hydrogenation of unsaturated fatty acids
Trans fatty acids
96
Identify the main enzyme path involved in reverse cholesterol pathway
LPL, LCAT, and HL
97
State the function of LPL and HL in the reverse cholesterol pathway
it is used to clear lipid and undergo LCAT-HDL-cholesterol ester, LDL, and VLDL are products of VLDL lipolysis
98
Identify the protein that helps in the clearance of lipids in the reverse cholesterol pathway
Apo A-I on HDL surface
99
State the clinical condition that occurs when there is a defect in the reverse cholesterol pathway
Atherosclerosis
100
Identify the main enzyme involved in the forward cholesterol pathway
LCAT (lecithin-cholesterol acyltransferase)
101
Specify the lipid that is increased in the forward lipid defects
IDL
102
Identify the condition caused by an increased amount of IDL in forward lipid defects
heart disease risk factor
103
Name the lipid transport particle cleared by LDL filters or liver in forward lipid defects
IDL
104
Identify the receptor type that is defective in familial hypercholesterolemia
LDL Receptor
105
Identify the molecule that is unable to bind to its receptor due to LDL receptor defects
ApoB-100
106
State the hereditary condition characterized by LDL receptor defects and high ApoB-100 accumulation in the blood
Familial Hypercholesterolemia
107
State the common clinical sign or deposition of cholesterol seen in the family of patients with LDL receptor defects
xanthomas
108
Identify the organ where ApoB-100 defects significantly impair the clearance of LDL
liver
109
Explain how defective ApoB-100 affects internal lipid levels in the body
it fails to lock onto liver receptors, which leads to high cholesterol levels because LDL cannot enter cells, so LDL and VLDL increase
110
Identify the specific lipid transport protein that is absent in abetalipoproteinemia
MTP (Microsomal Triglyceride Transfer Protein)
111
Identify the two main lipoproteins that are absent or low in abetalipoproteinemia due to MTP defects
Chylomicrons and VLDL
112
State the clinical presentation of abetalipoproteinemia related to fat absorption
steatorrhea
113
Identify the primary lipoprotein that is low in Tangier's disease
HDL
114
State the physical manifestation or symptom seen in the tonsils of patients with Tangier's disease
orange tonsils
115
Identify the specific cell type where cholesterol accumulates in Tangier's disease
macrophages
116
Name the condition characterized by low HDL, orange tonsils, and cholesterol accumulation in macrophages
Tangier's disease
117
Identify the specific apolipoprotein that is missing in Apo A-I deficiency
Apo A-I
118
Explain the effect of Apo A-I deficiency on HDL levels
critically reduces the level of HDL
119
Name the condition characterized by severe reduction in HDL due to the absence of its primary structural protein
Apo A-I deficiency
120
State the classification of a risk factor if the cholesterol level is high, LDL is low, and HDL is low
High Risk Factor
121
State the classification of a risk factor if the cholesterol level is high, LDL is high, and HDL is low
Very High Risk Factor
122
Enumerate the specific lipid profile criteria required to be classified under a High Risk Factor
high cholesterol, low LDL, and low HDL
123
Enumerate the specific lipid profile criteria required to be classified under a Very High Risk Factor
high cholesterol, high LDL, and low HDL
124
State the numerical range for low HDL that contributes to high risk classification
HDL <40 mg/dL
125
State the numerical range for high LDL that contributes to high risk classification
LDL >100, >130, or >160 mg/dL
126
State the numerical range for high cholesterol that contributes to high risk classification
cholesterol >200 mg/dL
127
State the numerical range for high triglycerides that contributes to high risk classification
triglycerides >150 mg/dL
128
Identify the specific lifestyle modification program recommended for patients categorized under lipid risk factors
therapeutic lifestyle intervention reduction program
129
Enumerate the lipid criteria for a patient categorized under "Negative RF"
HDL > 60 mg/dL and LDL <100 mg/dL, <130 mg/dL, or <160 mg/dL
130
Identify the specific lipid value that acts as a cardioprotective factor when it is greater than 60 mg/dL
HDL > 60 mg/dL
131
Identify the specific lipid value that acts as a cardioprotective factor when it is less than 100 mg/dL
LDL < 100 mg/dL
132
State the clinical implication of having an HDL level greater than 60 mg/dL and LDL less than 100 mg/dL
Cardioprotective (risk of hypercholesterolemia low)
133
Identify the condition characterized by an independent risk factor for arterial diseases involving plasminogen-like activity
Lp(a)
134
State the structural characteristics or functional similarity of Lp(a)
independent risk factor for arterial cell, PLASMINOGEN-LIKE ACTIVITY
135
Identify the specific lipid parameter characterized by a light density lipoprotein and a sticky nature
Lp(a)
136
State the clinical risk or consequence associated with elevated Lp(a) levels
CLOT REFUSES TO DISSOLVE, vascular blockages
137
Identify the primary reason why clots refuse to dissolve in the presence of high Lp(a)
due to its plasminogen-like activity that inhibits normal clot breakdown
138
State the normal reference value for total cholesterol
<200 mg/dL
139
State the reference range for borderline total cholesterol
200-239 mg/dL
140
State the reference range for high total cholesterol
Greater than or equal to 240 mg/dL
141
Enumerate the three classification categories for total cholesterol levels
Normal, Borderline, and High
142
Identify the chemical method used in the isolation and separation step of HDL measurement
precipitation
143
Enumerate the two main steps involved in the chemical method for HDL measurement
Step 1: Isolation/Separation and Step 2: Quantification
144
State the specific chemical reaction utilized in the quantification step of HDL measurement
Lieberman-Burchard reaction or Abell-Kendall
145
Enumerate the two reagents commonly used in the isolation step of HDL to precipitate non-HDL lipoproteins
Heptane + Sulfuric Acid or Phosphotungstate
146
Identify the reagent used in the three-step method for HDL isolation that involves heavy metal precipitation
Abell-Kendall method (using polyanions like phosphotungstate)
147
State the function of the polyanions and divalent cations in HDL isolation
VLDL, Chylomicrons, and LDL are precipitated out, leaving HDL in the supernatant
148
Identify the component found in the supernatant after the precipitation step in HDL isolation
HDL
149
Identify the current reference method used for the quantification of cholesterol as established by CDC
CDC Reference Method (Abell, Levy, and Brodie method)
150
State the original reference method that the current CDC method for cholesterol quantification was modified from
Abell-Kendall method
151
Identify the three main types of methods used for LDL measurement in the laboratory
Measured, Calculated, and Preferable Method
152
Identify the specific laboratory method used for direct measurement of LDL
Homogeneous Method
153
Enumerate the two traditional mathematical equations used for calculated LDL
Friedewald Method and De Long Method
154
State the mathematical formula for the Friedewald method used to calculate LDL cholesterol in mg/dL
LDL = TC - HDL - (TG / 5)
155
State the mathematical formula for the De Long method used to calculate LDL cholesterol in mg/dL
LDL = TC - HDL - (TG / 6.6)
156
Identify the specific lipid parameter that must be less than 400 mg/dL for the Friedewald equation to remain valid
Triglycerides (TG)
157
State the main limitation or restriction of using the Friedewald equation for calculating LDL
cannot be used if Triglycerides (TG) are >400 mg/dL
158
Identify the preferable method used for measuring LDL when triglyceride levels are extremely high or in non-fasting samples
Homogeneous Method
159
Identify the specific metabolic disease characterized by deficient or absent ABCA1 transporter activity
Tangier's disease (ABCA1 deficiency)
160
State the genetic transmission pattern or inheritance of Tangier's disease
Autosomal Recessive
161
Identify the primary lipoprotein that is severely decreased or absent in Tangier's disease due to ABCA1 mutation
HDL (Alpha-lipoprotein)
162
Identify the specific organ or tissue where cholesterol esters accumulate dramatically in Tangier's disease, changing its color
tonsils (orange tonsils)
163
Identify the specific condition characterized by a mutation in the LCAT gene leading to fish-eye disease
LCAT deficiency
164
State the clinical manifestation in the eyes of a patient with LCAT deficiency
Fish-eye disease (corneal opacities)
165
Identify the specific lipoprotein that is markedly decreased in LCAT deficiency
HDL
166
State the date written on the slide discussing LCAT deficiency and fish-eye disease
May 20, 2026
167
Identify the clinical significance or effect of having a low HDL level (<40 mg/dL)
Low HDL (HDL <40) is an alpha-lipoproteinemia
168
Identify the genetic cause behind familial hypercholesterolemia involving the ApoB gene
ApoB gene mutation
169
Identify the primary lipoprotein that accumulates to very high levels due to an ApoB gene mutation
LDL
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