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A new mutation that arose in one copy of gene Xin a somatic cell resulted in the formation of atumor. Which of the following pieces of evidencebest describes how the new mutation directlycaused the tumor?(A) Protein X normally stimulates cell division,(B) Protein X normally activates a growth(C) Protein X normally prevents passage through(D) Protein X normally regulates geneand the mutation created an overactive

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Answer:

(A) Protein x normally stimulates cell division.

Explanation:

Protein who stimulates cell division are known as proto-oncogenes. If there is a mutation in proto-oncogene ,then this gene is converted into oncogene which causes cancer. Here protein x ( proto-oncogenes) normally stimulates cell division, if new mutation occurs in this gene, then this gene is converted into oncogene and resulted in the formation of cancer.