题干
填信息。每空一词。
Work place | He works at a ____ station in New York. |
At home | He gets up at six ten every morning. |
He runs for ____ an hour. | |
On the way to work | He ____ to a bus stop. |
The bus ride usually takes about fifty ____. | |
He thinks the bus ride is ____. |
答案(点此获取答案解析）
train,half,walks,minutes,relaxing
分子上各有3个酶切位点，如图中箭头所指，如果线性DNA分
子在3个酶切位点上都被该酶切断，则会产生a、b、c、d四种不同长度的DNA片段；环状DNA分
