将标记的DNA分子放在的培养基上培养,经过3次复制,在所形成的子代DNA中,含的DNA占总数是[ ]
A.1/16
B.1/8
C.1/4
D.1/2
答案:C
A distribution with a mean of 15 and a range of 2 to 25 would be:()
A. normally distributed.
B. positively skewed to the right.
C. cannot be determine.
影响碳酸岩裂逢发育的因素有哪些?