A metastasis is _________
(a) a secondary tumor in a different part of the body that arises from a cell from the primary tumor.
(b) a cell that is dividing in defiance of normal constraints.
(c) a part of the primary tumor that has invaded the surrounding tissue.
(d) the portion of the cancerous tumor that displays genetic instability.
Choice (a) is correct. All tumors, benign or malignant, divide in defiance of normal constraints [choice (b)]. A malignant tumor will invade the surrounding tissue while a metastasis is found at a distant site from the original tumor [choice (c)]. The genetic instability seen in cancer cells is not limited to metastases [choice (d)].
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