A triglyceride molecule (the main component of fat)

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BlackTom AI · Accepted Answer

The question concerns triglycerides, the main component of fat, and asks you to evaluate each statement.
Option 1: 'makes up over 90% of the lipid in the diet' This is broadly accurate because dietary fats are predominantly triglycerides, which constitute the majority of lipid molecules consumed. While there are other lipid forms present (phospholipids, cholesterol esters, free fatty acids), triglycerides are the dominant class in typical dietary fat.
Option 2: 'can be liquid or hard at room temperature' This reflects the physical properties of triglycerides that depend on fatty acid saturation. Triglycerides with mostly saturated fatty acids tend to be solid at room temperature (fats), whereas those with more unsaturated fatty acids tend to be liquid (oils). Therefore, this statement is true.
Option 3: 'All of the answers are correct' If 1 and 2 are true (as discussed), and 4 and 5 are also true (see below), then this option is also true by logical inclusion. We will verify the remaining statements to confirm.
Option 4: 'is a relatively safe way to store fatty acids' Triglycerides store fatty acids efficiently in adipose tissue and are a stable, energy-dense form. While there are metabolic considerations and health concerns with excess fat storage, as a storage form, triglycerides are indeed a relatively safe and efficient reservoir for fatty acids compared to free fatty acids, which can be cytotoxic at high levels.
Option 5: 'contains 3 fatty acids' A defining structural feature of a triglyceride is glycerol backbone esterified with three fatty acid chains, so this statement is correct.
In summary, each of the statements 1, 2, 4, and 5 is true, and therefore statement 3 ('All of the answers are correct') is also true by logical consequence.

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A triglyceride molecule (the main component of fat)

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