試題詳解

35. To study the function of the essential cyclin genes in yeast, researchers constructed a shuttlc vector in which a copy of the cyclin gene was ligated to the GAL1 promoter. The vector was then introduced into haploid yeast cells in which all copies of the cyclin genes had been disrupted. Following introduction of the vector, you would expect that
(A) the yeast cells would grow on both glucose and galactose media.
(B) the yeast cells would grow on glucose but not galactose medium.
(C) the yeast cells would grow on galactose but not glucose medium.
(D) on transfer to either glucose or galactose medium, the vector-carrying cells would eventually stop growing because of insufficient cyclinexpression.
(E) none of the above