Multiple Choice
Which of the following is a feature that phospholipids and cholesterol have in common?
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1. Introduction to Biochemistry
Lipids
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Which of the following best describes the primary building blocks (monomers) of most lipids?
A
Monosaccharides
B
Amino acids
C
Nucleotides
D
Fatty acids and glycerol
Verified step by step guidance1
Understand the question: The problem is asking about the primary building blocks (monomers) of most lipids. Lipids are a class of biomolecules that include fats, oils, and phospholipids.
Recall the structure of lipids: Most lipids are composed of fatty acids and glycerol. Fatty acids are long hydrocarbon chains with a carboxyl group (-COOH) at one end, while glycerol is a three-carbon molecule with hydroxyl groups (-OH) attached to each carbon.
Eliminate incorrect options: Monosaccharides are the building blocks of carbohydrates, amino acids are the building blocks of proteins, and nucleotides are the building blocks of nucleic acids. None of these are relevant to lipids.
Identify the correct answer: Fatty acids and glycerol are the monomers that combine to form triglycerides, which are a common type of lipid. Triglycerides consist of three fatty acids esterified to a glycerol backbone.
Conclude: The correct answer is 'Fatty acids and glycerol,' as these are the primary building blocks of most lipids.
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