Ultrastructure of cells · USMLE Step 1

Which of the following organelles is characterized ultrastructurally by a double membrane and inner folds called cristae?

  1. Nucleus
  2. Rough endoplasmic reticulum
  3. Mitochondrion
  4. Golgi apparatus
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Correct answer: Mitochondrion

Mitochondria are double-membraned organelles whose inner membrane folds into cristae, maximizing surface area for oxidative phosphorylation and ATP production.

Difficulty: Medium Question 3 of 21

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