Cholesterol is

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Cholesterol is

BlackTom AI · Accepted Answer

Cholesterol is a lipid molecule that is a component of cell membranes and helps to modulate fluidity and stability of the membrane. 
Option 1: 'strengthens the membrane' is correct in the sense that cholesterol intercalates among phospholipids, reducing permeability and helping to maintain membrane integrity, especially across temperature changes. 
Option 2: 'good in all cases' is inaccurate because cholesterol levels and their effects can be context-dependent; high levels are linked to cardiovascular risk, and there are circumstances where excessive cholesterol can contribute to disease. 
Option 3: 'bad in all cases' overstates the negatives; while high cholesterol has health risks, the molecule also plays essential roles in membrane structure and in the synthesis of steroid hormones and bile acids. It is not inherently 'bad in all cases.' 
Option 4: 'a significant source of energy for humans' is false; cholesterol is not a major energy source; fats, carbohydrates, and proteins provide energy. Cholesterol’s primary roles are structural and as a precursor for other molecules, not as a fuel.

11:709:255:01 NUTRITION AND HEALTH Lecture Quiz 5 - Lipids Part I - Spring 2025

Cholesterol is

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