Which of the statements concerning cancer and mutations is correct?
1. cancer can only occur with a mutation in a somatic cell.
2. usually multiple mutations are required in different genes to cause cancer.
3. cancer can only occur with a mutation in a germ cell.
4. usually a single mutation is all that is required to cause cancer.
5. none of the other answer options is correct.

The correct answer is 2. Usually multiple mutations are required in different genes to cause cancer.

Explanation:

Mutation is the change in the DNA sequence of a cell which plays an important role in causing cancer. Mutation in many different genes allows the cell to grow and multiply in an uncontrollable manner. It also allows the cell to gain the property of metastasis.

Metastasis is the property of malignant tumor cell which allow the mutated cells to invade different tissues and organs and multiply in numbers. This property plays an important role in causing cancer. Therefore several mutations in different genes are required to cause cancer. So the correct answer is 2.

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