試題詳解

59. Proto-oncogenes can be converted to oncogenes by various genetic changes. Which of these mechanisms does not contribute to an abnormal cell cycle?
(A) A gene is transposed to a more active promoter.
(B) Chromosomes break and fragments are translocated from one chromosome to another.
(C) Point mutations occur that result in a protein more resistant to degradation.
(D) Extra copies of the gene are made, thereby enhancing expression.
(E) DNA methylation takes place.