单项选择题

On the xy-coordinate plane, a point defined by the (x,y) pair (m,2) lies on a circle with center (3,21) and radius 5.Which of the following is a possible value of m?

A.Which
B.8
B.6
C.21
D.22
E.27

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单项选择题

Suppose that Student 2’s model is correct and that thetransfer of genes between 2 bacteria was interruptedafter 30 min. Under these conditions, which of the fol-lowing genes would definitely NOT be transferredfrom the donor bacterium to the recipient bacterium?

A.Gene
B.Gene
C.Gene
D.Gene

单项选择题

Suppose that all 6 genes are transferred from a donorbacterium to a recipient bacterium. Under this condi-tion, which student(s) would argue that Gene A couldbe the last gene transferred?

A.Student
B.Student
C.Students
D.Students