Which observation proves that a cell is a eukaryote? A. It has ribosomes inside the cell. B. It is surrounded by a cell membrane. C. It has enclosed organelles inside the cell. D. It has DNA in the cell.

The answer is C.

Explanation:

It can't be A. because prokaryotes have ribosomes. It can't be D. because prokaryotes have a single loop of DNA and plasmids. It has to be C. because only eukaryotes have enclosed organelles in them.

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In homeostasis fashion, cells undergo balanced cell division and programmed cell death (apoptosis) through regulated signalling.This maintains tissue integrity. On the one hand, Proto-oncogenes promotes cells proliferation. On the other hand, tumors suppressors inhibit cell growth and division especially in cells with damaged dna.
Therefore mutations on these oncogenes could result to uncontrolled cell proliferation. Cancer cells also overexpress angiogens that results to proliferation of blood vessels in tumors. This contributes to their metastasis in the body.