
Concept explainers
To explain: The necessity to break the total serum cholesterol level into an LDL and HDL component.
Concept introduction: Cholesterol is a fatty substance required by our body to make hormones, vitamin D, and bile acids to aid the digestion. It is also needed to build and maintain the cell’s outer wall. It cannot dissolve in the blood and therefore, it is carried around by proteins. These fat and protein complexes are called lipoproteins.
To determine: The levels of LDL cholesterol and HDL cholesterol that are considered as normal.
Concept introduction: Cholesterol is a fatty substance required by our body to make hormones, vitamin D, and bile acids to aid the digestion. It is also needed to build and maintain the cell’s outer wall. It cannot dissolve in the blood and therefore, it is carried around by proteins. These fat and protein complexes are called lipoproteins.
To determine: The level of HDL cholesterol and LDL cholesterol that are associated with an increased risk of cardiovascular disease.
Concept introduction: Cholesterol is a fatty substance required by our body to make hormones, vitamin D, and bile acids to aid the digestion. It is also needed to build and maintain the cell’s outer wall. It cannot dissolve in the blood and therefore, it is carried around by proteins. These fat and protein complexes are called lipoproteins.
To determine: The type of drugs other than statins, affects the serum cholesterol levels.
Concept introduction: Cholesterol is a fatty substance required by our body to make hormones, vitamin D, and bile acids to aid the digestion. It is also needed to build and maintain the cell’s outer wall. It cannot dissolve in the blood and therefore, it is carried around by proteins. These fat and protein complexes are called lipoproteins.
To explain: The action of the drug against the cholesterol and the reason why they are used in combination.
Concept introduction: Cholesterol is a fatty substance required by our body to make hormones, vitamin D, and bile acids to aid the digestion. It is also needed to build and maintain the cell’s outer wall. It cannot dissolve in the blood and therefore, it is carried around by proteins. These fat and protein complexes are called lipoproteins.

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Chapter 20 Solutions
Biochemistry 410/411 Textbook - 5th Edition - Custom Texas A&M University
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