The cell does 4 represent is D. Mitochondrion. Thus, option "D" is correct.
What are mitochondria?
The crista is an integral part of the mitochondria. As you already know, mitochondrion is a cytoplasmic organelle. it has two members that delimit it, the outer membrane is completely smooth, however the inner membrane is composed of numerous folds, that are called crista, and that spread through the interior of the mitochondria.
These cristae have as main function to increase the surface of the inner membrane.
Thus, option "D" is correct.
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