Question

a researcher is studying a specific type of cellular defect in animal cells. she notices that cells with this defect have reduced energy storage and decreased cell membrane stability. which of the following predicts the type of cellular defect that is the most likely cause of the researcher’s observation? a a defect in fatty acid synthesis, reducing the formation of fats and phospholipids b a defect in cholesterol synthesis, leading to reduced cholesterol in cell membranes c a defect in steroid hormone production, leading to a depletion of energy reserves d a defect in unsaturated fatty acid production, affecting membrane fluidity

Explanation:

To solve this, we analyze each option:

• Option A: Fatty acid synthesis defect affects fat (energy storage) and phospholipids (cell membrane structure). Phospholipids are key in cell membranes, and reduced fat affects energy storage. This matches the researcher's observations (reduced energy storage, decreased membrane stability).
• Option B: Cholesterol in membranes affects fluidity, but cholesterol synthesis defect mainly impacts membrane fluidity, not directly energy storage (cholesterol isn't a primary energy storage molecule).
• Option C: Steroid hormone production defect relates to hormones, not directly to energy storage (fats) or cell membrane stability (phospholipids/unsaturated fats).
• Option D: Unsaturated fatty acid production defect affects membrane fluidity (good), but unsaturated fats are part of membranes, not the main energy storage (triglycerides are). So it doesn't explain reduced energy storage as well as A.

Answer:

A. A defect in fatty acid synthesis, reducing the formation of fats and phospholipids