In the diagram, the arrow is pointing at the: 
Definitions:
Integral Protein
A type of membrane protein that is permanently attached to the biological membrane.
Outer Boundary
The external limit or edge of a structure or area.
ATP Synthesis
The biochemical process of producing adenosine triphosphate (ATP), which is the primary energy carrier in cells, occurring in both the mitochondria during cellular respiration and chloroplasts during photosynthesis.
Contains DNA
Refers to cells or structures within organisms that hold the genetic material deoxyribonucleic acid.
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