Mitochondria
The Mitochondria has a double membrane.  It manufactures some of its own proteins.   They have their own DNA.  The mitochondria is the site for respiration.  The inner membrane is where most aerobic respiration occurs. 
When you touch the mitochondria, you can see the white ruffles.  These are called christae.
VACATION SITE: Slide on the Cristae Slide full of twists and ruffles! 
CAUTION: Be careful and buckle up!
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