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Multiple Choice
Which of the following statements is true of fatty acids?
A
They typically contain a long hydrocarbon chain with a terminal carboxyl group.
B
They are always fully saturated with hydrogen atoms.
C
They do not participate in the formation of triglycerides.
D
They are highly soluble in water due to their long hydrocarbon chains.
Verified step by step guidance
1
Understand the structure of fatty acids: Fatty acids are composed of a long hydrocarbon chain (hydrophobic) and a terminal carboxyl group (-COOH), which is hydrophilic. This amphipathic nature is key to their properties.
Evaluate the first statement: 'They typically contain a long hydrocarbon chain with a terminal carboxyl group.' This is a correct description of the general structure of fatty acids.
Evaluate the second statement: 'They are always fully saturated with hydrogen atoms.' This is incorrect because fatty acids can be either saturated (no double bonds) or unsaturated (one or more double bonds).
Evaluate the third statement: 'They do not participate in the formation of triglycerides.' This is incorrect because fatty acids are esterified with glycerol to form triglycerides, which are a major form of energy storage in organisms.
Evaluate the fourth statement: 'They are highly soluble in water due to their long hydrocarbon chains.' This is incorrect because the long hydrocarbon chain is hydrophobic, making fatty acids poorly soluble in water, though the carboxyl group can interact with water to a limited extent.