Multiple Choice
Steroid hormones are a type of lipid derived from which of the following?
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1. Introduction to Biochemistry
Lipids
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Which of the following is a type of lipid that is found only in foods of animal origin?
A
Phosphatidylcholine
B
Linoleic acid
C
Triglycerides
D
Cholesterol
Verified step by step guidance1
Step 1: Begin by understanding the types of lipids listed in the problem. Lipids are a diverse group of molecules, including fats, oils, and cholesterol, that are insoluble in water but soluble in organic solvents.
Step 2: Review the characteristics of each lipid option provided: Phosphatidylcholine is a phospholipid found in both plant and animal cells; Linoleic acid is an essential fatty acid found in both plant and animal sources; Triglycerides are the main form of fat storage in both plants and animals.
Step 3: Focus on cholesterol. Cholesterol is a sterol lipid that is synthesized by animals and is found exclusively in foods of animal origin. It plays a key role in cell membrane structure and serves as a precursor for steroid hormones and bile acids.
Step 4: Compare the options and identify the lipid that is unique to animal-derived foods. Cholesterol stands out as it is not found in plant-based foods, unlike the other lipids listed.
Step 5: Conclude that cholesterol is the correct answer based on its exclusivity to animal-origin foods and its biological role in animals.
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