【单选题】All of the cells in a particular plant start out with the same complement of genes. How then can these cells differentiate and form. structures as different as roots, stems, leaves, and fruits? The an...
A.
it is not known exactly what functions the hormones perform
B.
each hormone has various effects on plants
C.
none of the hormones can function without the others
D.
each hormone has different effects on different kinds of plants
E.
each hormone works on only a small subset of a cell’s genes at any particular time